JST — Japan Standard Time
JST is Japan Standard Time, +09:00, used in Asia. In code, use Asia/Tokyo rather than the abbreviation.
Use the IANA name, not the abbreviation
Python
from datetime import datetime
from zoneinfo import ZoneInfo
# right: an IANA zone carries the full history of rule changes
now = datetime.now(ZoneInfo("Asia/Tokyo"))
print(now.isoformat(), now.tzname())
# wrong: an abbreviation is not resolvable, and a hard-coded offset
# silently rots the next time the rules change
# now = datetime.now(timezone(timedelta(hours=...))) # don'tJST questions
What does JST stand for?
JST is Japan Standard Time, +09:00, used in Asia. The IANA zone to use in code is Asia/Tokyo.
What time is it in JST right now?
Japan Standard Time: 09:15 on Thursday (JST).
Which IANA timezone should I use instead of JST?
Asia/Tokyo for Japan Standard Time. Date libraries cannot resolve bare abbreviations, and an abbreviation carries no daylight-saving history, so a stored offset silently rots when a government changes the rules.