How many hours is IST ahead of CST?

IST is currently -2h 30m relative to CST, using Asia/Shanghai and Asia/Kolkata as the live reference zones on this page.

What is the best workday overlap between CST and IST?

The current 9-to-5 overlap is about 5.5 hours: CST 11:30 AM previous day to 5:00 PM previous day, which matches IST 9:00 AM previous day to 2:30 PM previous day.

Which cities commonly use CST and IST?

CST commonly covers cities such as Shanghai, Beijing, Shenzhen, and Guangzhou, while IST commonly covers cities such as Mumbai, Delhi, Bengaluru, and Hyderabad.

Should I use CST/IST or exact IANA zones?

Use the abbreviations for a quick read, but use exact IANA zones such as Asia/Shanghai and Asia/Kolkata when you need something precise in software, travel plans, or long-range scheduling.

Timezone converter

CST to IST Converter.

CST → ISTGap: -2h 30m5.5h 9-5 overlap

CST to IST currently uses China Time in Asia/Shanghai and India Time in Asia/Kolkata as the live reference pair, with a -2h 30m live gap. CST to IST matters whenever Shanghai and Mumbai need to coordinate across a -2h 30m gap. The CST side covers China and Mexico, while IST covers India and Israel — that country mix is the practical reason this conversion shows up in calendars rather than the abstract offset math.

Last updated recently. Offset math, DST behavior, and city coverage on both sides are refreshed from the live timezone dataset during the page revalidation window.

Ambiguity note

CST is ambiguous in this dataset, so the live converter uses Asia/Shanghai as the busiest reference zone while the city list below shows the wider label family.

IST is ambiguous in this dataset, so the live converter uses Asia/Kolkata as the busiest reference zone while the city list below shows the wider label family.

From

CST

China Time

Asia/Shanghai · GMT+8 +08:00

--:--:--

Major markets in this grouping include Shanghai, Beijing, Shenzhen, Guangzhou.

IST

India Time

Asia/Kolkata · GMT+5:30 +05:30

--:--:--

Major markets in this grouping include Mumbai, Delhi, Bengaluru, Hyderabad.

Scheduling snapshot

Current gap

-2h 30m

CST +08:00 vs IST +05:30

9-to-5 overlap

5.5h

CST 11:30 AM previous day to 5:00 PM previous day

Representative countries

China, Mexico, and United States / India, Israel, and Sri Lanka

Based on the busiest city and zone usage found in the current dataset.

Pair context

CST (Shanghai, +08:00) to IST (Mumbai, +05:30) is currently a -2h 30m conversion. Live coverage on the CST side is anchored by Shanghai, Beijing, Shenzhen, and Guangzhou; the IST side draws from Mumbai, Delhi, Bengaluru, and Hyderabad.

CST to IST matters whenever Shanghai and Mumbai need to coordinate across a -2h 30m gap. The CST side covers China and Mexico, while IST covers India and Israel — that country mix is the practical reason this conversion shows up in calendars rather than the abstract offset math.

CST means an overloaded label spanning North American Central Time, Cuba Time, and China-related meanings in the catalog; watch US and Canadian DST windows, Mexico and Central America holidays, and Cuba public holidays. IST is grounded here by India, Israel, and Sri Lanka. The curated side is where most same-offset duplication risk is removed, because it names the civil calendar and operating context users actually mean.

Both reference zones sit inside Asia, so this is a regional comparison rather than a long-haul conversion. The gap of -2h 30m mostly affects intra-continental travel, regional logistics, and Asia-wide calendars.

Neither CST nor IST observes daylight saving on the reference zones used here, so the gap stays steady all year. That makes this pair predictable for recurring meetings, broadcast schedules, and contracts that care about a stable offset.

CST and IST sit 2h 30m apart, leaving a generous 5.5h of shared 9-to-5 time. With that much overlap, this pair behaves almost like a single workday, so meeting times are negotiable rather than forced into a narrow corner of the calendar.

Pair details

Reference zone, current offsets, country and city anchors, overlap math, and date-shift answers for CST to IST.

Reference pair

Asia/Shanghai -> Asia/Kolkata

Live offsets

CST +08:00 vs IST +05:30

Meaning split

China Time / India Time

Country anchors

China, Mexico, and United States -> India, Israel, and Sri Lanka

City anchors

Shanghai, Beijing, Shenzhen, Guangzhou -> Mumbai, Delhi, Bengaluru, Hyderabad

Workday overlap

5.5h window: CST 11:30 AM previous day-5:00 PM previous day

Morning answer

9 AM CST = 6:30 AM IST, same day

Evening answer

6 PM CST = 3:30 PM IST, same day

Calendar and scheduling context

Same-offset labels can share the same hour while still landing in different countries, calendars, cities, and workday windows. These notes show the practical context behind this conversion.

Exact pair identity

CST to IST is pinned to Asia/Shanghai -> Asia/Kolkata, with the shorthand labels shown as context. The city anchors are Shanghai, Beijing, Shenzhen, Guangzhou on the CST side and Mumbai, Delhi, Bengaluru, Hyderabad on the IST side, with -2h 30m between the live reference zones.

Civil calendar differences

The 12 popular-hour answers include 12 same-day conversions, 0 next-day conversions, and 0 previous-day conversions. That distribution is what separates this page from a static offset chart.

Same-offset caution

Nearby labels sharing a current offset include WITA (From side). They may match mathematically, but their country calendars, city anchors, and common search intent differ from this exact pair.

Jurisdiction evidence

CST: China (CN); 2078 mapped cities; capital Beijing; Chinese; CNY Chinese yuan | CST: Mexico (MX); 470 mapped cities; capital Mexico City; Spanish; MXN Mexican peso | CST: United States (US); 899 mapped cities; capital Washington, D.C.; English; USD United States dollar | CST: Cuba (CU); 140 mapped cities; capital Havana; Spanish; CUC Cuban convertible peso, CUP Cuban peso | CST: Guatemala (GT); 102 mapped cities; capital Guatemala City; Spanish; GTQ Guatemalan quetzal | IST: India (IN); 3776 mapped cities; capital New Delhi; English, Hindi, Tamil; INR Indian rupee | IST: Israel (IL); 108 mapped cities; capital Jerusalem; Arabic, Hebrew; ILS Israeli new shekel | IST: Sri Lanka (LK); 60 mapped cities; capital Sri Jayawardenepura Kotte; Sinhala, Tamil; LKR Sri Lankan rupee

Pair fingerprint

Offset behavior, DST gap changes, local calendar evidence, and the day-shift pattern across the most common conversion hours.

Offset behavior class

CST/IST is a short-haul offset gap: Asia/Shanghai currently reads +08:00, Asia/Kolkata reads +05:30, and the live delta is -2h 30m. This class decides whether the page behaves like a same-day planner or a handoff planner.

DST asymmetry check

Asia/Shanghai and Asia/Kolkata do not show a detected near-term DST gap-change note in this sample, but the page still exposes exact IANA zones so users do not treat the abbreviation pair as permanently fixed.

Calendar evidence

No country holiday snapshot is attached to this exact pair yet, so the page leans on city anchors, IANA zones, offsets, and the live conversion table instead of pretending a local calendar exists.

Day-shift fingerprint

Across the 12 popular-hour answers, this pair has 12 same-day answers, 0 next-day answers, 0 previous-day answers. That mix is specific to the current Asia/Shanghai -> Asia/Kolkata relationship and helps users see whether dates must be written explicitly in invites, travel plans, and release schedules.

Same-offset and canonical audit

Same-offset converter clusters can look identical if the page only shows a numeric offset. This audit states whether the route should be indexed, which canonical peer it follows when consolidated, and what pair-specific evidence keeps the page useful.

Indexing posture

This pair remains indexable because the route has enough pair-specific context: Asia/Shanghai -> Asia/Kolkata, country anchors, city anchors, calendar notes, and day-shift examples.

Same-offset math check

CST and IST are not currently a same-offset pair; the live delta is -2h 30m. Same-offset neighbors are still listed because users often confuse nearby abbreviations.

Neighbor audit

WITA (From side, +08:00) The page keeps these labels visible so SGT/HKT/GST-style clusters do not blur into one generic offset page.

Canonical evidence

CST/IST uses 12 same-day answers, 0 next-day answers, 0 previous-day answers; 5.5h strict workday overlap; source zones Asia/Shanghai and Asia/Kolkata; country anchors China, Mexico, and United States -> India, Israel, and Sri Lanka.

Local intent behind each abbreviation

Common places, calendars, markets, languages, and operating contexts behindCST and IST.

CST

CST local intent 1

CST is one of the most overloaded timezone abbreviations on the site. It can mean North American Central Time, Cuba Time, China-related civil time, or other catalog meanings depending on the source. A CST converter page must be read through the representative IANA zone and the listed city anchors, not through the letters alone.

CST

CST local intent 2

For international users, CST is a trap label: Chicago, Mexico City, Havana, Macau, Shanghai, and Urumqi are not interchangeable scheduling contexts. The same three letters can imply different countries, DST rules, holidays, languages, and date-shift behavior.

Country calendar contrast

Same-offset conversions can still land in different public-holiday, language, currency, and city-anchor contexts. These rows use the country profile and holiday snapshots behind each side of the pair.

CST

China

2,078 mapped city anchors; zones Asia/Shanghai, Asia/Urumqi.capital Beijing; Chinese; CNY Chinese yuan

Holiday snapshot: New Year's Day (Jan 1, Public) · Chinese New Year (Spring Festival) (Feb 17, Public) · Labour Day (May 1, Public) · Dragon Boat Festival (Jun 19, Public) · Mid-Autumn Festival (Sep 25, Public)

CST

Mexico

470 mapped city anchors; zones America/Mexico_City, America/Matamoros.capital Mexico City; Spanish; MXN Mexican peso

Holiday snapshot: New Year's Day (Jan 1, Public) · Constitution Day (Feb 2, Public) · Benito Juárez's birthday (Mar 16, Public) · Maundy Thursday (Apr 2, Bank) · Good Friday (Apr 3, Bank)

CST

United States

899 mapped city anchors; zones America/Chicago.capital Washington, D.C.; English; USD United States dollar

Holiday snapshot: New Year's Day (Jan 1, Public) · Martin Luther King, Jr. Day (Jan 19, Public) · Lincoln's Birthday (Feb 12, Observance) · Presidents Day (Feb 16, Public) · Good Friday (Apr 3, Public)

CST

Cuba

140 mapped city anchors; zones America/Havana.capital Havana; Spanish; CUC Cuban convertible peso, CUP Cuban peso

Holiday snapshot: Triumph of the Revolution (Jan 1, Public) · Victory of Fidel Castro (Jan 2, Public) · Good Friday (Apr 3, Public) · Labour Day (May 1, Public) · Day before the Commemoration of the Assault of the Moncada garrison (Jul 25, Public)

CST

Guatemala

102 mapped city anchors; zones America/Guatemala.capital Guatemala City; Spanish; GTQ Guatemalan quetzal

Holiday snapshot: New Year's Day (Jan 1, Public) · Maundy Thursday (Apr 2, Public) · Good Friday (Apr 3, Public) · Holy Saturday (Apr 4, Public) · Easter Sunday (Apr 5, Public)

IST

India

3,776 mapped city anchors; zones Asia/Kolkata.capital New Delhi; English, Hindi, Tamil; INR Indian rupee

Holiday snapshot: Republic Day (Jan 26, Public) · Holi (Mar 4, Public) · Eid al-Fitr (Mar 21, Public) · Mahavir Jayanti (Mar 31, Public) · Good Friday (Apr 3, Public)

Neighboring abbreviation checks

These are the labels most likely to be confused with either side of this conversion. A matching UTC offset does not mean the same country, calendar, market, source convention, or user intent.

From side: WITA

same offset

CST and WITA match on offset right now, but the page should not collapse them: they carry different city anchors, country calendars, currencies, holidays, and user intent.

Current side: CST: China Time via Asia/Shanghai, +08:00; cities Shanghai, China, Beijing, China, and Shenzhen, China; countries China, Mexico, and United States.
Neighbor side: WITA: Central Indonesia Time via Asia/Makassar, +08:00; cities Makassar, Indonesia, Samarinda, Indonesia, and Denpasar, Indonesia; countries Indonesia.

Open WITA

From side: ACWST

nearby

CST and ACWST are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.

Current side: CST: China Time via Asia/Shanghai, +08:00; cities Shanghai, China, Beijing, China, and Shenzhen, China; countries China, Mexico, and United States.
Neighbor side: ACWST: Australian Central Western Time via Australia/Eucla, +08:45; cities No country breakdown available; countries Australia.

Open ACWST

From side: ACDT

nearby

CST and ACDT are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.

Current side: CST: China Time via Asia/Shanghai, +08:00; cities Shanghai, China, Beijing, China, and Shenzhen, China; countries China, Mexico, and United States.
Neighbor side: ACDT: Australian Central Time via Australia/Adelaide, +09:30; cities Adelaide, Australia, Darwin, Australia, and Adelaide Hills, Australia; countries Australia.

Open ACDT

From side: ACST

nearby

CST and ACST are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.

Current side: CST: China Time via Asia/Shanghai, +08:00; cities Shanghai, China, Beijing, China, and Shenzhen, China; countries China, Mexico, and United States.
Neighbor side: ACST: Australian Central Time via Australia/Adelaide, +09:30; cities Adelaide, Australia, Darwin, Australia, and Adelaide Hills, Australia; countries Australia.

Open ACST

From side: CAT

nearby

CST and CAT are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.

Current side: CST: China Time via Asia/Shanghai, +08:00; cities Shanghai, China, Beijing, China, and Shenzhen, China; countries China, Mexico, and United States.
Neighbor side: CAT: Central Africa Time via Africa/Lubumbashi, +02:00; cities Lubumbashi, Democratic Republic of the Congo, Lusaka, Zambia, and Mbuji-Mayi, Democratic Republic of the Congo; countries Democratic Republic of the Congo, Zambia, and Sudan.

Open CAT

From side: CDT

nearby

CST and CDT are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.

Current side: CST: China Time via Asia/Shanghai, +08:00; cities Shanghai, China, Beijing, China, and Shenzhen, China; countries China, Mexico, and United States.
Neighbor side: CDT: Central Time via America/Chicago, -05:00; cities Chicago, United States, Houston, United States, and San Antonio, United States; countries United States, Canada, and Mexico.

Open CDT

To side: IOT

nearby

IST and IOT are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.

Current side: IST: India Time via Asia/Kolkata, +05:30; cities Mumbai, India, Delhi, India, and Bengaluru, India; countries India, Israel, and Sri Lanka.
Neighbor side: IOT: Indian Ocean Time via Indian/Chagos, +06:00; cities No country breakdown available; countries British Indian Ocean Territory.

Open IOT

To side: AFT

nearby

IST and AFT are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.

Current side: IST: India Time via Asia/Kolkata, +05:30; cities Mumbai, India, Delhi, India, and Bengaluru, India; countries India, Israel, and Sri Lanka.
Neighbor side: AFT: Afghanistan Time via Asia/Kabul, +04:30; cities Kabul, Afghanistan, Herāt, Afghanistan, and Kandahār, Afghanistan; countries Afghanistan.

Open AFT

To side: BST

nearby

IST and BST are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.

Current side: IST: India Time via Asia/Kolkata, +05:30; cities Mumbai, India, Delhi, India, and Bengaluru, India; countries India, Israel, and Sri Lanka.
Neighbor side: BST: Bangladesh Time via Asia/Dhaka, +06:00; cities Dhaka, Bangladesh, London, United Kingdom, and Abidjan, Ivory Coast; countries Bangladesh, United Kingdom, and Ivory Coast.

Open BST

To side: BTT

nearby

IST and BTT are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.

Current side: IST: India Time via Asia/Kolkata, +05:30; cities Mumbai, India, Delhi, India, and Bengaluru, India; countries India, Israel, and Sri Lanka.
Neighbor side: BTT: Bhutan Time via Asia/Thimphu, +06:00; cities Thimphu, Bhutan, Phuntsholing, Bhutan, and Tsirang, Bhutan; countries Bhutan.

Open BTT

To side: CCT

nearby

IST and CCT are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.

Current side: IST: India Time via Asia/Kolkata, +05:30; cities Mumbai, India, Delhi, India, and Bengaluru, India; countries India, Israel, and Sri Lanka.
Neighbor side: CCT: Cocos Islands Time via Indian/Cocos, +06:30; cities West Island, Cocos Islands; countries Cocos Islands.

Open CCT

To side: FSAT

nearby

IST and FSAT are close enough to be confused in search, but they are not the same clock label and should be pinned to exact IANA zones.

Current side: IST: India Time via Asia/Kolkata, +05:30; cities Mumbai, India, Delhi, India, and Bengaluru, India; countries India, Israel, and Sri Lanka.
Neighbor side: FSAT: French Southern & Antarctic Time via Indian/Kerguelen, +05:00; cities Port-aux-Français, French Southern Territories; countries French Southern Territories.

Open FSAT

Jurisdiction and city roster

Abbreviations with the same UTC offset can still represent different countries, cities, currencies, languages, and civil-time histories. This roster keeps theCST to IST page grounded in those concrete places.

CST: Mexico (MX); 470 mapped cities; zones America/Mexico City, America/Matamoros; city anchors Mexico City (America/Mexico_City, pop 12,294,193), Iztapalapa (America/Mexico_City, pop 1,835,486), Puebla (America/Mexico_City, pop 1,692,181), Ecatepec de Morelos (America/Mexico_City, pop 1,645,352); official United Mexican States; capital Mexico City; region Americas; subregion North America; population 130,575,786; area 1,964,375 km2; languages Spanish; currency MXN Mexican peso.

CST: United States (US); 899 mapped cities; zones America/Chicago; city anchors Chicago (America/Chicago, pop 2,664,452), Houston (America/Chicago, pop 2,314,157), San Antonio (America/Chicago, pop 1,526,656), Dallas (America/Chicago, pop 1,326,087); official United States of America; capital Washington, D.C.; region Americas; subregion North America; population 340,110,988; area 9,525,067 km2; languages English; currency USD United States dollar.

CST: Cuba (CU); 140 mapped cities; zones America/Havana; city anchors Havana (America/Havana, pop 2,163,824), Santiago de Cuba (America/Havana, pop 555,865), Camagüey (America/Havana, pop 347,562), Holguín (America/Havana, pop 319,102); official Republic of Cuba; capital Havana; region Americas; subregion Caribbean; population 9,748,007; area 109,884 km2; languages Spanish; currency CUC Cuban convertible peso, CUP Cuban peso.

CST: Guatemala (GT); 102 mapped cities; zones America/Guatemala; city anchors Guatemala City (America/Guatemala, pop 994,938), Villa Nueva (America/Guatemala, pop 618,397), Mixco (America/Guatemala, pop 465,773), Cobán (America/Guatemala, pop 212,047); official Republic of Guatemala; capital Guatemala City; region Americas; subregion Central America; population 18,079,810; area 108,889 km2; languages Spanish; currency GTQ Guatemalan quetzal.

IST: Israel (IL); 108 mapped cities; zones Asia/Jerusalem; city anchors Jerusalem (Asia/Jerusalem, pop 971,800), Tel Aviv (Asia/Jerusalem, pop 432,892), West Jerusalem (Asia/Jerusalem, pop 400,000), Haifa (Asia/Jerusalem, pop 285,316); official State of Israel; capital Jerusalem; region Asia; subregion Western Asia; population 10,134,800; area 21,937 km2; languages Arabic, Hebrew; currency ILS Israeli new shekel.

IST: Sri Lanka (LK); 60 mapped cities; zones Asia/Colombo; city anchors Colombo (Asia/Colombo, pop 648,034), Dehiwala-Mount Lavinia (Asia/Colombo, pop 219,827), Maharagama (Asia/Colombo, pop 195,355), Jaffna (Asia/Colombo, pop 169,102); official Democratic Socialist Republic of Sri Lanka; capital Sri Jayawardenepura Kotte; region Asia; subregion Southern Asia; population 21,763,170; area 65,610 km2; languages Sinhala, Tamil; currency LKR Sri Lankan rupee.

Abbreviation identity dossier

Same-offset converter pages can look deceptively alike. These records pin the page to the exact abbreviations, IANA zones, countries, and city anchors behind CST and IST.

From side meaning roster

CST (cst) is ambiguous in the abbreviation catalog. Meaning records: Central Time at UTC-06:00; listed zones America/Belize; America/Guatemala; America/Managua; America/Mexico City; America/Costa Rica; America/El Salvador; America/Regina; America/Tegucigalpa; America/Chicago; America/Matamoros; America/Winnipeg; source label Central Time - Belize City, San Pedro, Orange Walk, Belmopan | Cuba Time at UTC-05:00; listed zones America/Havana; source label Cuba Time - Havana, Santiago de Cuba, Camagüey, Holguín | China Time at UTC+06:00; listed zones Asia/Urumqi; source label China Time - Ürümqi, Shihezi, Korla, Aqsu | China Time at UTC+08:00; listed zones Asia/Macau; Asia/Shanghai; source label China Time - Macau, Taipa, Sé, Luhuan.

From side country footprint

CST currently maps to 8 country footprints in the converter dataset: China (CN), Mexico (MX), United States (US), Cuba (CU), Guatemala (GT), Nicaragua (NI), Honduras (HN), Canada (CA). The footprint spans 11 IANA zones across 10 city anchors.

From side city anchors

CST city anchors in this indexed page family: Shanghai [shanghai-CN, CN, Asia/Shanghai, pop 24,874,500]; Beijing [beijing-CN, CN, Asia/Shanghai, pop 18,960,744]; Shenzhen [shenzhen-CN, CN, Asia/Shanghai, pop 17,494,398]; Guangzhou [guangzhou-CN, CN, Asia/Shanghai, pop 16,096,724]; Chengdu [chengdu-CN, CN, Asia/Shanghai, pop 13,568,357]; Mexico City [mexico-city-MX, MX, America/Mexico_City, pop 12,294,193]; Tianjin [tianjin-CN, CN, Asia/Shanghai, pop 11,090,314]; Wuhan [wuhan-CN, CN, Asia/Shanghai, pop 10,392,693]; Dongguan [dongguan-CN, CN, Asia/Shanghai, pop 9,644,871]; Xi’an [xi-an-CN, CN, Asia/Shanghai, pop 9,600,000].

From side jurisdiction dossier

CST: China (CN); 2078 mapped cities; zones Asia/Shanghai, Asia/Urumqi; city anchors Shanghai (Asia/Shanghai, pop 24,874,500), Beijing (Asia/Shanghai, pop 18,960,744), Shenzhen (Asia/Shanghai, pop 17,494,398), Guangzhou (Asia/Shanghai, pop 16,096,724); official People's Republic of China; capital Beijing; region Asia; subregion Eastern Asia; population 1,408,280,000; area 9,706,961 km2; languages Chinese; currency CNY Chinese yuan. CST: Mexico (MX); 470 mapped cities; zones America/Mexico City, America/Matamoros; city anchors Mexico City (America/Mexico_City, pop 12,294,193), Iztapalapa (America/Mexico_City, pop 1,835,486), Puebla (America/Mexico_City, pop 1,692,181), Ecatepec de Morelos (America/Mexico_City, pop 1,645,352); official United Mexican States; capital Mexico City; region Americas; subregion North America; population 130,575,786; area 1,964,375 km2; languages Spanish; currency MXN Mexican peso. CST: United States (US); 899 mapped cities; zones America/Chicago; city anchors Chicago (America/Chicago, pop 2,664,452), Houston (America/Chicago, pop 2,314,157), San Antonio (America/Chicago, pop 1,526,656), Dallas (America/Chicago, pop 1,326,087); official United States of America; capital Washington, D.C.; region Americas; subregion North America; population 340,110,988; area 9,525,067 km2; languages English; currency USD United States dollar. CST: Cuba (CU); 140 mapped cities; zones America/Havana; city anchors Havana (America/Havana, pop 2,163,824), Santiago de Cuba (America/Havana, pop 555,865), Camagüey (America/Havana, pop 347,562), Holguín (America/Havana, pop 319,102); official Republic of Cuba; capital Havana; region Americas; subregion Caribbean; population 9,748,007; area 109,884 km2; languages Spanish; currency CUC Cuban convertible peso, CUP Cuban peso. CST: Guatemala (GT); 102 mapped cities; zones America/Guatemala; city anchors Guatemala City (America/Guatemala, pop 994,938), Villa Nueva (America/Guatemala, pop 618,397), Mixco (America/Guatemala, pop 465,773), Cobán (America/Guatemala, pop 212,047); official Republic of Guatemala; capital Guatemala City; region Americas; subregion Central America; population 18,079,810; area 108,889 km2; languages Spanish; currency GTQ Guatemalan quetzal.

To side meaning roster

IST (ist) is ambiguous in the abbreviation catalog. Meaning records: Israel Time at UTC+02:00; listed zones Asia/Jerusalem; source label Israel Time - Jerusalem, Tel Aviv, West Jerusalem, Haifa | India Time at UTC+05:30; listed zones Asia/Colombo; Asia/Kolkata; source label India Time - Colombo, Dehiwala-Mount Lavinia, Maharagama, Jaffna.

To side country footprint

IST currently maps to 3 country footprints in the converter dataset: India (IN), Israel (IL), Sri Lanka (LK). The footprint spans 3 IANA zones across 10 city anchors.

To side city anchors

IST city anchors in this indexed page family: Mumbai [mumbai-IN, IN, Asia/Kolkata, pop 12,691,836]; Delhi [delhi-IN, IN, Asia/Kolkata, pop 11,034,555]; Bengaluru [bengaluru-IN, IN, Asia/Kolkata, pop 8,495,492]; Hyderabad [hyderabad-IN, IN, Asia/Kolkata, pop 6,993,262]; Ahmedabad [ahmedabad-IN, IN, Asia/Kolkata, pop 6,357,693]; Chennai [chennai-IN, IN, Asia/Kolkata, pop 4,681,087]; Kolkata [kolkata-IN, IN, Asia/Kolkata, pop 4,631,392]; Surat [surat-IN, IN, Asia/Kolkata, pop 4,591,246]; Pune [pune-IN, IN, Asia/Kolkata, pop 3,124,458]; Jaipur [jaipur-IN, IN, Asia/Kolkata, pop 3,046,163].

To side jurisdiction dossier

IST: India (IN); 3776 mapped cities; zones Asia/Kolkata; city anchors Mumbai (Asia/Kolkata, pop 12,691,836), Delhi (Asia/Kolkata, pop 11,034,555), Bengaluru (Asia/Kolkata, pop 8,495,492), Hyderabad (Asia/Kolkata, pop 6,993,262); official Republic of India; capital New Delhi; region Asia; subregion Southern Asia; population 1,417,492,000; area 3,287,263 km2; languages English, Hindi, Tamil; currency INR Indian rupee. IST: Israel (IL); 108 mapped cities; zones Asia/Jerusalem; city anchors Jerusalem (Asia/Jerusalem, pop 971,800), Tel Aviv (Asia/Jerusalem, pop 432,892), West Jerusalem (Asia/Jerusalem, pop 400,000), Haifa (Asia/Jerusalem, pop 285,316); official State of Israel; capital Jerusalem; region Asia; subregion Western Asia; population 10,134,800; area 21,937 km2; languages Arabic, Hebrew; currency ILS Israeli new shekel. IST: Sri Lanka (LK); 60 mapped cities; zones Asia/Colombo; city anchors Colombo (Asia/Colombo, pop 648,034), Dehiwala-Mount Lavinia (Asia/Colombo, pop 219,827), Maharagama (Asia/Colombo, pop 195,355), Jaffna (Asia/Colombo, pop 169,102); official Democratic Socialist Republic of Sri Lanka; capital Sri Jayawardenepura Kotte; region Asia; subregion Southern Asia; population 21,763,170; area 65,610 km2; languages Sinhala, Tamil; currency LKR Sri Lankan rupee.

From side timezone narrative

CST is reused across 4 different meanings in this dataset — China Time, Central Time, and Cuba Time — which is why the short code alone is not enough to identify a place. Each meaning maps to its own IANA zone family and its own DST behavior, and they happen to share the same letters by historical accident more than by design. The busiest cities using CST in the current catalog are Shanghai, Beijing, Shenzhen, Guangzhou, and Chengdu. The lead live reference on this page is Shanghai (Asia/Shanghai), currently at +08:00 (GMT+8). Those cities are what give CST its actual feel rather than the abstract offset. CST has a local identity beyond its offset: an overloaded label spanning North American Central Time, Cuba Time, and China-related meanings in the catalog. Calendar signals such as US and Canadian DST windows, Mexico and Central America holidays, Cuba public holidays, and China-related civil-calendar context and operational signals such as Chicago, Dallas, Mexico City, Havana, Macau, Shanghai, and Urumqi schedule disambiguation are why this abbreviation should not be flattened into a same-offset neighbor. Because CST spans UTC-06:00 to UTC+08:00 across the active meanings, software, calendars, and contracts should always pin a specific IANA zone such as Asia/Shanghai or a literal UTC offset. The short label is fine for headlines and chat; it is the wrong primitive for storing or scheduling timestamps.

From side policy and precision notes

CST appears with 4 distinct meanings in current data, splitting across UTC-06:00 to UTC+08:00. The short label looks tidy in writing but quietly hides which place you mean — pick a city, a country, or an IANA zone before it matters. CST is never safe without a place name: the legal-time rule changes when the source is America/Chicago, America/Havana, Asia/Shanghai, or another listed zone. Not the same as ICT or WIB: CST is usually the source ambiguity, while ICT and WIB are target-region labels with different country calendars. Asia/Shanghai does not show an offset change in the next year, which makes CST predictable for short-term scheduling. Predictable is not the same as permanent — civil-time rules still get changed by governments on relatively short notice. For precise work, the safest equivalent of CST is the exact IANA zone used by your city or system. Asia/Shanghai sits at +08:00, ahead of UTC, which means daily logs in this zone reach a new calendar date before UTC does — a small detail that breaks date-based reporting if missed.

From side nearby abbreviations

CST should not be blindly swapped with nearby labels. Adjacent references in the catalog: WITA (+08:00, Shares the central time family); ACWST (+08:45, Shares the central time family); ACDT (+09:30, Shares the central time family); ACST (+09:30, Shares the central time family); CAT (+02:00, Shares the central time family); CDT (-05:00, Shares the central time family).

From side answer profile

CST has 4 meaning records, offset range UTC-06:00 to UTC+08:00, labels China Time, Central Time, Cuba Time, and 12 country footprints across 15 IANA zones.

To side timezone narrative

IST is reused across 2 different meanings in this dataset — India Time and Israel Time — which is why the short code alone is not enough to identify a place. Each meaning maps to its own IANA zone family and its own DST behavior, and they happen to share the same letters by historical accident more than by design. The busiest cities using IST in the current catalog are Mumbai, Delhi, Bengaluru, Hyderabad, and Ahmedabad. The lead live reference on this page is Mumbai (Asia/Kolkata), currently at +05:30 (GMT+5:30). Those cities are what give IST its actual feel rather than the abstract offset. Because IST spans UTC+02:00 to UTC+05:30 across the active meanings, software, calendars, and contracts should always pin a specific IANA zone such as Asia/Kolkata or a literal UTC offset. The short label is fine for headlines and chat; it is the wrong primitive for storing or scheduling timestamps.

To side policy and precision notes

IST appears with 2 distinct meanings in current data, splitting across UTC+02:00 to UTC+05:30. The short label looks tidy in writing but quietly hides which place you mean — pick a city, a country, or an IANA zone before it matters. Asia/Kolkata does not show an offset change in the next year, which makes IST predictable for short-term scheduling. Predictable is not the same as permanent — civil-time rules still get changed by governments on relatively short notice. For precise work, the safest equivalent of IST is the exact IANA zone used by your city or system. Asia/Kolkata sits at +05:30, ahead of UTC, which means daily logs in this zone reach a new calendar date before UTC does — a small detail that breaks date-based reporting if missed.

To side nearby abbreviations

IST should not be blindly swapped with nearby labels. Adjacent references in the catalog: IOT (+06:00, Runs on a nearby UTC offset); AFT (+04:30, Runs on a nearby UTC offset); BST (+06:00, Runs on a nearby UTC offset); BTT (+06:00, Runs on a nearby UTC offset); CCT (+06:30, Runs on a nearby UTC offset); FSAT (+05:00, Runs on a nearby UTC offset).

To side answer profile

IST has 2 meaning records, offset range UTC+02:00 to UTC+05:30, labels India Time, Israel Time, and 3 country footprints across 3 IANA zones.

From side country reference summary

CST country anchor China: China, officially the People's Republic of China (PRC), is a country in East Asia. It is the second-most populous country after India, with a population exceeding 1.4 billion, representing 17% of the world's population. China borders fourteen countries by land across an area of 9.6 million square kilometers (3,700,000 sq mi), making it the third-largest country by area. The country is divided into 33 province-level divisions: 22 provinces, 5 autonomous regions, 4 municipalities, and 2 semi-autonomous special administrative regions. Beijing is the capital, while Shanghai is the most populous city by urban area and largest financial center. Source: Wikipedia.

To side country reference summary

IST country anchor India: India, officially the Republic of India, is a country in South Asia. It is the seventh-largest country by area; the most populous country in the world and, since its independence in 1947, the world's most populous democracy. Bounded by the Indian Ocean on the south, the Arabian Sea on the southwest, and the Bay of Bengal on the southeast, it shares land borders with Pakistan to the west; China, Nepal and Bhutan to the north; Bangladesh and Myanmar to the east. In the Indian Ocean, India is near Sri Lanka and the Maldives. Its Andaman and Nicobar Islands share a maritime border with Myanmar, Thailand and Indonesia. Source: Wikipedia.

From side trust note 1

From side trust note 2

Pair identity check

CST/IST uses Asia/Shanghai -> Asia/Kolkata, offset delta -2h 30m, overlap 5.5h, route /convert/cst/ist/, and live abbreviation readings GMT+8/GMT+5:30.

Reference data for CST to IST

Reference fields include this converter pair's abbreviation records, representative IANA zones, current offsets, city anchors, country profiles, overlap math, conversion examples, and dossier notes.

centraltimebelizecitysanpedroorangewalkbelmopancubatimehavanasantiagodecubacamagüeyholguínchinatimeürümqishihezikorlaaqsuchinatimemacautaipaséluhuanisraeltimejerusalemtelavivwestjerusalemhaifaindiatimecolombodehiwalamountlaviniamaharagamajaffnaasiashanghaiasiakolkatachinatimeindiatime1130ampreviousday500pmpreviousdayunitedstatessrilankashanghaicnshanghaibeijingcnshenzhencnshenzhenguangzhoucnguangzhoumexicocitymxmexicocityamericamexicocitymumbaiinbengaluruinbengaluruhyderabadinhyderabadchineseyuaneasternasiamexicanpesoamericasnorthamericawashingtondcunitedstatesdollarcubanconvertiblepesocubanpesocaribbeanguatemalaguatemalacityguatemalanquetzalcentralamericanewdelhiindianrupeesouthernasiajerusalemisraelinewshekelwesternasiasrijayawardenepurakottesrilankanrupeeasiashanghaiasiaurumqicapitalbeijingchinesecnychineseyuanamericamexicocityamericamatamoroscapitalmexicocityspanishmxnmexicanpesoamericachicagocapitalwashingtondcenglishusdunitedstatesdollaramericahavanacapitalhavanaspanishcuccubanconvertiblepesocupcubanpesoamericaguatemalacapitalguatemalacityspanishgtqguatemalanquetzalcapitalnewdelhienglishhinditamilinrindianrupeereferencepairasiashanghaiasiakolkataliveoffsetscst0800vsist0530meaningsplitchinatimeindiatimecountryanchorschinamexicoandunitedstatesindiaisraelandsrilankacityanchorsshanghaibeijingshenzhenguangzhoumumbaidelhibengaluruhyderabadworkdayoverlap55hwindowcst1130ampreviousday500pmpreviousdaymorninganswer9amcst630amistsamedayeveninganswer6pmcst330pmistsamedaycstlocalintent1cstlocalintent2exactpairidentitycivilcalendardifferencessameoffsetcautionjurisdictionevidenceoffsetbehaviorclassdstasymmetrycheckcalendarevidencedayshiftfingerprintindexingposturesameoffsetmathcheckneighborauditcanonicalevidencefromsidesharesthecentraltimefamilyrunsonanearbyutcoffsetfromsidemeaningrosterfromsidecountryfootprintfromsidecityanchorsfromsidejurisdictiondossiertosidemeaningrostertosidecountryfootprinttosidecityanchorstosidejurisdictiondossierfromsidetimezonenarrativefromsidepolicyandprecisionnotesfromsidenearbyabbreviationsfromsideanswerprofiletosidetimezonenarrativetosidepolicyandprecisionnotestosidenearbyabbreviationstosideanswerprofilefromsidecountryreferencesummarytosidecountryreferencesummaryfromsidetrustnote1fromsidetrustnote2pairidentitycheckistcentralcentraltimetimebelizebelizecity

Market coverage on both sides

CST coverage on this page is led by Shanghai, China, Beijing, China, Shenzhen, China, and Guangzhou, China, with 2 more in the live dataset. That mix is what makes CST feel anchored to East Asian financial centers in practice rather than just an abbreviation on a chart. Local signals include Chicago, Dallas, Mexico City, Havana, Macau, Shanghai, and Urumqi schedule disambiguation.

IST coverage is led by Mumbai, India, Delhi, India, Bengaluru, India, and Hyderabad, India, with 2 more anchoring the wider label family. Combined with the CST side, this conversion ends up describing intra-Asia regional logistics and travel coordination.

Digit-roll converter

Adjust the time. Digits roll like an odometer, and the swap button flips the zones.

From

Common meeting times

CST to IST meeting times

Quick conversions for 9 AM, noon, 3 PM, 6 PM, and 9 PM based on today's local calendar.

CST	IST	Day relation
9:00 AM	6:30 AMMon, May 25	same day
12:00 PM	9:30 AMMon, May 25	same day
3:00 PM	12:30 PMMon, May 25	same day
6:00 PM	3:30 PMMon, May 25	same day
9:00 PM	6:30 PMMon, May 25	same day

IST to CST meeting times

Quick conversions for 9 AM, noon, 3 PM, 6 PM, and 9 PM based on today's local calendar.

IST	CST	Day relation
9:00 AM	11:30 AMMon, May 25	same day
12:00 PM	2:30 PMMon, May 25	same day
3:00 PM	5:30 PMMon, May 25	same day
6:00 PM	8:30 PMMon, May 25	same day
9:00 PM	11:30 PMMon, May 25	same day

Operational notes

CST to IST ranges from CST 9:00 AM (which lands at IST 6:30 AM) through CST 9:00 PM (IST 6:30 PM). The -2h 30m gap is small enough that CST mornings still reach IST working hours, so most invites scheduled in CST land cleanly without confusing the IST recipient.

IST to CST ranges from IST 9:00 AM (which lands at CST 11:30 AM) through IST 9:00 PM (CST 11:30 PM). The -2h 30m gap is small enough that IST mornings still reach CST working hours, so most invites scheduled in IST land cleanly without confusing the CST recipient.

Overlap window and DST radar

The live gap is -2h 30m right now, based on Asia/Shanghai at +08:00 and Asia/Kolkata at +05:30. Neither reference zone shows an offset change in the next year, so the gap should stay stable.

The most usable workday block right now is about 5.5 hours: CST 11:30 AM previous day to 5:00 PM previous day, which lines up with IST 9:00 AM previous day to 2:30 PM previous day.

Reference zones

Asia/Shanghai

GMT+8 · +08:00

Asia/Kolkata

GMT+5:30 · +05:30

These are the busiest live references selected from the abbreviation families on this page.

Conversion Table

CST	IST
08:00	05:30
09:00	06:30
10:00	07:30
11:00	08:30
12:00	09:30
13:00	10:30
14:00	11:30
15:00	12:30
16:00	13:30
17:00	14:30
18:00	15:30
19:00	16:30
20:00	17:30
21:00	18:30
22:00	19:30
23:00	20:30
00:00	21:30
01:00	22:30
02:00	23:30
03:00	00:30
04:00	01:30
05:00	02:30
06:00	03:30
07:00	04:30

Top cities using CST

Countries represented here include China, Mexico, and United States.

ShanghaiChina BeijingChina ShenzhenChina GuangzhouChina Mexico CityMexico

Top cities using IST

Countries represented here include India, Israel, and Sri Lanka.

MumbaiIndia DelhiIndia BengaluruIndia HyderabadIndia

FAQ

How many hours is IST ahead of CST?: IST is currently -2h 30m relative to CST, using Asia/Shanghai and Asia/Kolkata as the live reference zones on this page.
What is the best workday overlap between CST and IST?: The current 9-to-5 overlap is about 5.5 hours: CST 11:30 AM previous day to 5:00 PM previous day, which matches IST 9:00 AM previous day to 2:30 PM previous day.
Does the CST-IST time difference change during DST?: The live gap is -2h 30m right now, based on Asia/Shanghai at +08:00 and Asia/Kolkata at +05:30. Neither reference zone shows an offset change in the next year, so the gap should stay stable.
Which cities commonly use CST and IST?: CST commonly covers cities such as Shanghai, Beijing, Shenzhen, and Guangzhou, while IST commonly covers cities such as Mumbai, Delhi, Bengaluru, and Hyderabad.
Should I use CST/IST or exact IANA zones?: Use the abbreviations for a quick read, but use exact IANA zones such as Asia/Shanghai and Asia/Kolkata when you need something precise in software, travel plans, or long-range scheduling.

Open Interactive Converter

Related Conversions

EST → CST EST → IST PST → CST PST → IST CST → MST CST → GMT CST → UTC CST → CET CST → CEST CST → JST CST → AEST CST → AEDT

Related planning pages

Once a conversion pair matters, people usually need a city page, compare page, or a broader browse surface next.

Interactive converter

Move from this static pair into the full timezone converter with more cities and abbreviations.

Compare city pairs

Use compare pages when the practical question is overlap, not just offset arithmetic.

World clock

Open live city clocks after narrowing the timezone pair you care about.

Browse city pages

Jump into the strongest city pages when you want location-specific timezone context.

CST to IST Converter.

Ambiguity note

CST

IST

Scheduling snapshot

Pair context

Pair details

Calendar and scheduling context

Exact pair identity

Civil calendar differences

Same-offset caution

Jurisdiction evidence

Pair fingerprint

Offset behavior class

DST asymmetry check

Calendar evidence

Day-shift fingerprint

Same-offset and canonical audit

Indexing posture

Same-offset math check

Neighbor audit

Canonical evidence

Local intent behind each abbreviation

CST local intent 1

CST local intent 2

Country calendar contrast

China

Mexico

United States

Cuba

Guatemala

India

Neighboring abbreviation checks

From side: WITA

From side: ACWST

From side: ACDT

From side: ACST

From side: CAT

From side: CDT

To side: IOT

To side: AFT

To side: BST

To side: BTT

To side: CCT

To side: FSAT

Jurisdiction and city roster

Abbreviation identity dossier

From side meaning roster

From side country footprint

From side city anchors

From side jurisdiction dossier

To side meaning roster

To side country footprint

To side city anchors

To side jurisdiction dossier

From side timezone narrative

From side policy and precision notes

From side nearby abbreviations

From side answer profile

To side timezone narrative

To side policy and precision notes

To side nearby abbreviations

To side answer profile

From side country reference summary

To side country reference summary

From side trust note 1

From side trust note 2

Pair identity check

Market coverage on both sides

Digit-roll converter

Common meeting times

CST to IST meeting times

IST to CST meeting times

Operational notes

Popular hour answers

What is 8 AM CST in IST?

What is 9 AM CST in IST?

What is 10 AM CST in IST?

What is 11 AM CST in IST?

What is 12 PM CST in IST?