The short answer
Chatham Standard Time is 11 hours 45 minutes ahead of Irish Standard Time.
Chatham Standard Time☀
9:20:38am
+12:45 · UTC+12:45 · Thu, Jun 25
Irish Standard Time☾
9:35:38pm
IST · UTC+01:00 · Wed, Jun 24
Read across to convert
Chatham Standard Time
+12:45 · UTC+12:45
Irish Standard Time
IST · UTC+01:00
Click any row to pin that hour across both zones.
12amThu
12:15pmWed ·−1d
WORK1am
1:15pmWed ·−1d
WORK2am
2:15pmWed ·−1d
WORK3am
3:15pmWed ·−1d
WORK4am
4:15pmWed ·−1d
WORK5am
5:15pmWed ·−1d
6am
6:15pmWed ·−1d
7am
7:15pmWed ·−1d
8am
8:15pmWed ·−1d
NOW
9am
WORK9:15pmWed ·−1d
10am
WORK10:15pmWed ·−1d
11am
WORK11:15pmWed ·−1d
12pm
WORK12:15amThu
1pm
WORK1:15am
2pm
WORK2:15am
3pm
WORK3:15am
4pm
WORK4:15am
5pm
5:15am
6pm
6:15am
7pm
7:15am
8pm
8:15am
9pm
9:15am
WORK10pm
10:15am
WORK11pm
11:15am
WORKdaylightnightworking hoursoverlap
Best time to meet
No shared working hours.
Chatham Standard Time and Irish Standard Time are too far apart for a working-day overlap. The least-unsociable option is an early-morning call on one side and an evening one on the other — or hand work off asynchronously and let the planet do the waiting.
Popular conversions
Quick reference.
9amChatham Standard Time=9:15pmIrish Standard Time · prev day
12pmChatham Standard Time=12:15amIrish Standard Time
3pmChatham Standard Time=3:15amIrish Standard Time
5pmChatham Standard Time=5:15amIrish Standard Time
9pmChatham Standard Time=9:15amIrish Standard Time
In context
What each side covers.
Chatham Standard Time
9:20am+12:45 · UTC+12:45
Chatham Standard Time
Irish Standard Time
9:35pmIST · UTC+01:00
Cities on this clock
Related converters
Other popular pairs.
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1:35pm
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2:05am
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Eastern Standard Time
4:35pm
Central European Time
10:35pm
Eastern Time to Central Europe6 hours behind
India Standard Time
2:05am
Eastern Standard Time
4:35pm
India to Eastern Time9 hours 30 minutes ahead
Greenwich Mean Time
9:35pm
India Standard Time
2:05am
London to India4 hours 30 minutes behind
Pacific Standard Time
1:35pm
Eastern Standard Time
4:35pm
Pacific to Eastern Time3 hours behind
Central European Time
10:35pm
India Standard Time
2:05am
Central Europe to India3 hours 30 minutes behind
Frequently asked
Quick answers about converting between Chatham Standard Time and Irish Standard Time. Can't find what you need? Email [email protected].
- What is the time difference between Chatham Standard Time and Irish Standard Time?
- Chatham Standard Time is 11 hours 45 minutes ahead of Irish 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 9am in Chatham Standard Time, what time is it in Irish Standard Time?
- 9am in Chatham Standard Time is 9:15pm in Irish Standard Time on the previous day. Use the hour-by-hour table above to read any other time across — find the row and read the matching cell in the other column.
- What's the best time for a call between Chatham Standard Time and Irish Standard Time?
- There's no comfortable 9-to-5 overlap between Chatham Standard Time and Irish Standard Time — they sit on opposite sides of the planet's working day. Plan for an early or late call on one side, or hand work off asynchronously.
- Does this account for daylight saving time?
- Yes. We track every clock change in both places, so the abbreviations you see — +12:45 and IST — 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.