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Convert Chatham Time to Greenwich Mean Time

CHAST · UTC+12:45 → GMT · UTC+0

CHAST is 12 hours 45 minutes ahead of GMT

Chatham · CHADT

Thursday, 8 October 2026

London · BST

Wednesday, 7 October 2026

When are both sides at work?

0003060912151821
ChathamCHADT · +13:45
0003060912151821
LondonBST · +01:00
1114172023020508

No overlap in standard working hours. Closest workable window: 09:00–12:00 in Chatham, which is 20:15–23:15 in London.

Working (09–18) Awake, off the clock Asleep (23–07)

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01:11 Thu 8 Oct Chatham = 12:26 Wed 7 Oct London

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Hour-by-hour conversion

Chatham (CHAST)London (GMT)
00:0011:15prev. day
01:0012:15prev. dayNow
02:0013:15prev. day
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11:0022:15prev. day
12:0023:15prev. day
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15:0002:15
16:0003:15
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18:0005:15
19:0006:15
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21:0008:15
22:0009:15
23:0010:15

About this conversion

CHAST here means Chatham Time, represented by Chatham (Pacific/Chatham), currently UTC+13:45. GMT means Greenwich Mean Time, represented by London (Europe/London), currently UTC+1.

GMT is used by 22 zones, including United Kingdom. See every meaning of GMT.

Working hours are shown as 09:00–18:00 local, and sleeping hours as 23:00–07:00. The hour table is anchored on the current day in Chatham; day boundaries are marked where the date differs.

Quick answers

  • 09:00 CHAST is 20:15 GMT
  • 12:00 CHAST is 23:15 GMT
  • 15:00 CHAST is 02:15 GMT
  • 18:00 CHAST is 05:15 GMT

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