The short answer

3am in Chatham Standard Time is 10:15am in Eastern Standard Time on the previous day.

Chatham Standard Time is 16 hours 45 minutes ahead of Eastern Standard Time. It falls outside the 9-to-5 in Chatham Standard Time but lands inside working hours in Eastern Standard Time.

Chatham Standard Time☾
3am
Eastern Standard Time☀
10:15am
previous day
Right now
10:25am+12:45 · UTC+12:45 · Thu, Jun 25
5:40pmEDT · UTC-04:00 · Wed, Jun 24
Read across to convert
Chatham Standard Time
+12:45 · UTC+12:45
10:25am ☀
Eastern Standard Time
EDT · UTC-04:00
5:40pm ☀
Pinned3amChatham Standard Time=10:15amEastern Standard Time · Wed (previous day)
12amThu
7:15amWed ·−1d
1am
8:15amWed ·−1d
2am
9:15amWed ·−1d
WORK
PINNED
3am
10:15amWed ·−1d
WORK
4am
11:15amWed ·−1d
WORK
5am
12:15pmWed ·−1d
WORK
6am
1:15pmWed ·−1d
WORK
7am
2:15pmWed ·−1d
WORK
8am
3:15pmWed ·−1d
WORK
9am
WORK
4:15pmWed ·−1d
WORK
NOW
10am
WORK
5:15pmWed ·−1d
11am
WORK
6:15pmWed ·−1d
12pm
WORK
7:15pmWed ·−1d
1pm
WORK
8:15pmWed ·−1d
2pm
WORK
9:15pmWed ·−1d
3pm
WORK
10:15pmWed ·−1d
4pm
WORK
11:15pmWed ·−1d
5pm
12:15amThu
6pm
1:15am
7pm
2:15am
8pm
3:15am
9pm
4:15am
10pm
5:15am
11pm
6:15am
daylightnightworking hoursoverlap
Convert a specific time12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
Best time to meet
Best for a call
Chatham Standard Time
9am–10am
=
Eastern Standard Time
4:15pm–5:15pm
previous day
Popular conversions

Quick reference.

9amChatham Standard Time=4:15pmEastern Standard Time · prev day
12pmChatham Standard Time=7:15pmEastern Standard Time · prev day
3pmChatham Standard Time=10:15pmEastern Standard Time · prev day
5pmChatham Standard Time=12:15amEastern Standard Time
9pmChatham Standard Time=4:15amEastern Standard Time
In context

What each side covers.

Chatham Standard Time
+12:45 · UTC+12:45
10:25am

Chatham Standard Time

Eastern Standard Time
EDT · UTC-04:00
5:40pm
Cities on this clock
Washington, D.C.New YorkBrooklynQueens
Did you mean…? “EDT” is shared by several places. This page shows Eastern Standard Time (US & Canada) — or switch to Australian Eastern Standard Time.

Frequently asked

Quick answers about converting between Chatham Standard Time and Eastern Standard Time. Can't find what you need? Email [email protected].

What is the time difference between Chatham Standard Time and Eastern Standard Time?
Chatham Standard Time is 16 hours 45 minutes ahead of Eastern Standard Time right now. We always show the live, daylight-saving-correct difference, so this figure already accounts for whichever side is observing summer time today.
When it's 3am in Chatham Standard Time, what time is it in Eastern Standard Time?
3am in Chatham Standard Time is 10:15am in Eastern Standard Time on the previous day. It falls outside the 9-to-5 in Chatham Standard Time but lands inside working hours in Eastern Standard Time. Use the hour-by-hour table above to read any other time across.
What's the best time for a call between Chatham Standard Time and Eastern Standard Time?
9am–10am in Chatham Standard Time lines up with 4:15pm–5:15pm in Eastern Standard Time the previous day — both sides are inside a 9-to-5 working day.
Does this account for daylight saving time?
Yes. We track every clock change in both places, so the abbreviations you see — +12:45 and EDT — are the ones actually in effect right now, not a fixed all-year value. When either side changes its clocks, this page updates automatically.
Why is the date sometimes different on each side?
When two places are far enough apart, the same moment can fall on different calendar days. That is why some conversions are marked "previous day" or "next day" — it is the same instant in time, read off two clocks that crossed midnight at different points.