The short answer
Chatham Daylight Time is 12 hours 45 minutes ahead of British Summer Time.
Chatham Daylight Time☀
1:55:42pm
+13:45 · UTC+13:45 · Thu, Oct 15
British Summer Time☾
1:10:42am
BST · UTC+01:00 · Thu, Oct 15
Read across to convert
Chatham Daylight Time
+13:45 · UTC+13:45
British Summer Time
BST · UTC+01:00
Click any row to pin that hour across both zones.
12amThu
11:15amWed ·−1d
WORK1am
12:15pmWed ·−1d
WORK2am
1:15pmWed ·−1d
WORK3am
2:15pmWed ·−1d
WORK4am
3:15pmWed ·−1d
WORK5am
4:15pmWed ·−1d
WORK6am
5:15pmWed ·−1d
7am
6:15pmWed ·−1d
8am
7:15pmWed ·−1d
9am
WORK8:15pmWed ·−1d
10am
WORK9:15pmWed ·−1d
11am
WORK10:15pmWed ·−1d
12pm
WORK11:15pmWed ·−1d
NOW
1pm
WORK12:15amThu
2pm
WORK1:15am
3pm
WORK2:15am
4pm
WORK3:15am
5pm
4:15am
6pm
5:15am
7pm
6:15am
8pm
7:15am
9pm
8:15am
10pm
9:15am
WORK11pm
10:15am
WORKdaylightnightworking hoursoverlap
Best time to meet=
Closest workable window
Just outside the working window — early on one side, late on the other.
Chatham Daylight Time
7am–8am
British Summer Time
6:15pm–7:15pm
previous day
Popular conversions
Quick reference.
9amChatham Daylight Time=8:15pmBritish Summer Time · prev day
12pmChatham Daylight Time=11:15pmBritish Summer Time · prev day
3pmChatham Daylight Time=2:15amBritish Summer Time
5pmChatham Daylight Time=4:15amBritish Summer Time
9pmChatham Daylight Time=8:15amBritish Summer Time
In context
What each side covers.
Chatham Daylight Time
1:55pm+13:45 · UTC+13:45
Chatham Daylight Time
British Summer Time
1:10amBST · UTC+01:00
Cities on this clock
Related converters
Other popular pairs.
Pacific Time
5:10pm
India Standard Time
5:40am
Pacific Time to India12 hours 30 minutes behind
Eastern Daylight Time
8:10pm
Central European Time
2:10am
Eastern Time to Central Europe6 hours behind
India Standard Time
5:40am
Eastern Daylight Time
8:10pm
India to Eastern Time9 hours 30 minutes ahead
British Summer Time
1:10am
India Standard Time
5:40am
London to India4 hours 30 minutes behind
Pacific Daylight Time
5:10pm
Eastern Daylight Time
8:10pm
Pacific to Eastern Time3 hours behind
Central European Time
2:10am
India Standard Time
5:40am
Central Europe to India3 hours 30 minutes behind
Frequently asked
Quick answers about converting between Chatham Daylight Time and British Summer Time. Can't find what you need? Email [email protected].
- What is the time difference between Chatham Daylight Time and British Summer Time?
- Chatham Daylight Time is 12 hours 45 minutes ahead of British Summer 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 Daylight Time, what time is it in British Summer Time?
- 9am in Chatham Daylight Time is 8:15pm in British Summer 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 Daylight Time and British Summer Time?
- There's no comfortable 9-to-5 overlap between Chatham Daylight Time and British Summer 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 — +13:45 and BST — 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.