Convert AEST to EST
To convert AEST to EST: 10:00 AM AEST is 7:00 PM EST the previous day. AEST is UTC+10:00 and EST is UTC-05:00, so EST is 15 hours behind AEST, but not all year, as explained below.
In Eastern Standard Time
- 10:00 AM AEST
- 7:00 PM EST (previous day)
- On a 24-hour clock
- 10:00 AEST is 19:00 EST
- The offsets
- AEST is UTC+10:00, EST is UTC-05:00
- Difference
- EST is 15 hours behind AEST
- Date
- The previous day. Going back 15 hours crosses midnight from this time.
- This gap does NOT hold all year Convert through the offset in force on the date you care about.
- The two ends switch on different dates, or one does not switch at all.
- AEST is only in force part of the year South-eastern Australia: daylight time starts the first Sunday in October, at 02:00 local time and ends the first Sunday in April, at 03:00 local time (state legislation, aligned since 2008). In 2026 that is 2026-10-04 to 2026-04-05. Sydney is on AEDT between those dates.
- otherwise AEDT, UTC+11:00
- Military time zone letters Z (Zulu) is UTC. A to M run east of Greenwich an hour apart, N to Y west, and J is left out. A letter names an offset, so a zone that switches to daylight time changes letter: EST is R, EDT is Q.
- AEST is K (Kilo), EST is R (Romeo)
- In every zone
- HST 14:00 AKST 15:00 PST 16:00 AKDT 16:00 MST 17:00 PDT 17:00 CST 18:00 MDT 18:00 EST 19:00 CDT 19:00 EDT 20:00 UTC 00:00 GMT 00:00 BST 01:00 CET 01:00 CEST 02:00 EET 02:00 EEST 03:00 MSK 03:00 IST 05:30 SGT 08:00 HKT 08:00 JST 09:00 AEST 10:00 AEDT 11:00 NZST 12:00 NZDT 13:00
How the Time Zone Converter works
Australian Eastern Standard Time (AEST) is UTC+10:00 and Eastern Standard Time (EST) is UTC-05:00, so converting AEST to EST means subtracting 15 hours from the AEST time. EST is 15 hours behind AEST.
Worked through: 10:00 AM AEST is 7:00 PM EST the previous day. Note the date: this pair crosses midnight for much of the day, so the answer is often a different day as well as a different time. The day is the part a conversion done in your head tends to drop.
The gap between these two is not the same all year, which is the thing to get right. the two zones switch on different dates (AEST under the South-eastern Australia rule and EST under the United States one), so the difference moves. Convert through the offset in force on the date you care about rather than through the abbreviation somebody typed; the offsets above are definitions and the abbreviation is a claim about the calendar.
Fifteen hours back, and the pair where the hemispheres fight each other. Sydney's daylight saving runs October to April and New York's March to November, so the gap between them takes three different values across a year: 14, 15 and 16 hours depending on which end has switched. For about two weeks in April and again in October both ends are shifting in opposite directions at once. No other commonly searched pair is this unstable, and it is the clearest argument for storing an instant rather than a local time and a label.
One thing worth stating plainly, because it is the most common mistake in this whole subject: an abbreviation is not a place. AEST is Australian Eastern Standard Time, which Sydney uses only part of the year; the rest of the time it is on AEDT at UTC+11:00. EST is likewise only in force for part of the year in New York; otherwise it is EDT at UTC-04:00. If what you have is a city and a date rather than a pair of abbreviations, that is a different question and needs the tz database, not arithmetic. This is also why the shifting designations exist: ET means Eastern time whichever of the two is in force. Searching for ET and searching for AEST to EST are the same question in two vocabularies, which is why this converter answers both.
Common times for this pair:
- 9:00 AM AEST is 6:00 PM EST the previous day - 10:00 AM AEST is 7:00 PM EST the previous day - 3:00 PM AEST is 12:00 AM EST - 5:00 PM AEST is 2:00 AM EST
Time Zone Converter FAQ
What is the time difference between AEST and EST?
EST is 15 hours behind AEST. AEST is UTC+10:00 and EST is UTC-05:00, and both offsets are definitions rather than measurements, so the subtraction is exact.
What time is 10:00 AM AEST in EST?
10:00 AM AEST is 7:00 PM EST the previous day. Subtract 15 hours and carry the date if it crosses midnight.
Does the difference between AEST and EST change with daylight saving?
Yes, and this is the main thing to watch on this pair. the two switch under different rules and on different dates, so the difference takes more than one value across the year. In 2026 the South-eastern Australia switch runs from 2026-10-04 to 2026-04-05.
Is there anything specific to this pair worth knowing?
Fifteen hours back, and the pair where the hemispheres fight each other. Sydney's daylight saving runs October to April and New York's March to November, so the gap between them takes three different values across a year: 14, 15 and 16 hours depending on which end has switched. For about two weeks in April and again in October both ends are shifting in opposite directions at once. No other commonly searched pair is this unstable, and it is the clearest argument for storing an instant rather than a local time and a label.
Someone wrote AEST but it is summer. What do they mean?
Almost certainly the zone rather than the abbreviation: Sydney time, which in summer is AEDT at UTC+11:00 rather than AEST at UTC+10:00. People type the standard-time abbreviation all year round. If an invitation is an hour out from what you calculated, this is why.