CCT resolves cleanly here, but Asian labels often share letters with American or European ones — IST is shared between India and Israel, for instance. Pinning Indian/Cocos avoids that whole class of confusion.
Indian/Cocos does not show an offset change in the next year, which makes CCT 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 CCT is the exact IANA zone used by your city or system. Indian/Cocos sits at +06:30, 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.
Within this single zone (Indian/Cocos, +06:30), CCT is unambiguous, so the abbreviation and the IANA zone effectively interchange.