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 — pick it below.
Eastern Standard Time · North America
03:53:59
Thursday, 13 August 2026
- abbreviation denotes
- -05:00
- in force right now
- EDT (UTC-04:00) · DST
- use in code
- America/New_York
- also valid
- America/Toronto, America/Detroit
- next clock change
- 1 Nov 2026 01:00 → EST
US and Canadian east coast, winter half of the year.
Right now this zone is on EDT, not EST —
they are the same place at different times of year.
Eastern Standard Time (Australia) · Oceania
17:53:59
Thursday, 13 August 2026
- abbreviation denotes
- +10:00
- in force right now
- AEST (UTC+10:00)
- use in code
- Australia/Sydney
- next clock change
- 4 Oct 2026 03:00 → AEDT
Historic Australian usage, now written AEST to avoid the clash.
Right now this zone is on AEST, 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: 03:53 on Thursday (EDT); Eastern Standard Time (Australia): 17:53 on Thursday (AEST).
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.
Why does my computer show EDT instead of EST?
Because America/New_York is currently on EDT (UTC-04:00), its daylight-saving variant. EST (-05:00) applies during the other half of the year. Both names refer to the same place, one hour apart.