EST: which one do you mean?
EST means 2 different things, and they are hours apart. If you received a timestamp labelled EST, the sender's location decides which of these applies, so pick it below.
Eastern Standard Time · North America
14:58:25
Sunday, 15 November 2026
- abbreviation denotes
- -05:00
- in force right now
- EST (UTC-05:00)
- use in code
- America/New_York
- also valid
- America/Toronto, America/Detroit
- next clock change
- 14 Mar 2027 03:00 → EDT
US and Canadian east coast, winter half of the year.
Eastern Standard Time (Australia) · Oceania
06:58:25
Monday, 16 November 2026
- abbreviation denotes
- +10:00
- in force right now
- AEDT (UTC+11:00) · DST
- use in code
- Australia/Sydney
- next clock change
- 4 Apr 2027 02:00 → AEST
Historic Australian usage, now written AEST to avoid the clash.
Right now this zone is on AEDT, not EST. They are the same place at different times of year.
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("America/New_York"))
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'tEST questions
What does EST stand for?
EST has 2 distinct meanings in active use: Eastern Standard Time (-05:00, America/New_York); Eastern Standard Time (Australia) (+10:00, Australia/Sydney). Which one applies depends entirely on who wrote the timestamp.
What time is it in EST right now?
Eastern Standard Time: 14:58 on Sunday (EST); Eastern Standard Time (Australia): 06:58 on Monday (AEDT).
Which IANA timezone should I use instead of EST?
America/New_York for Eastern Standard Time, Australia/Sydney for Eastern Standard Time (Australia). 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.