GMT to CAT Time Converter
CAT is 1 hour ahead of GMT. The UK and Ireland are currently on BST (UTC+1:00), and CAT is UTC+2:00.
Best Time to Call Between GMT and CAT
Both zones are inside normal business hours between 9:00 AM and 4:00 PM GMT — that's 10:00 AM to 5:00 PM CAT. That's a 7-hour window.
both at work GMT only CAT only neither — hours along the strip are GMT.
Common Times Converted
GMT on the left, CAT on the right.
GMT to CAT: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| GMT | CAT | Working hours |
|---|---|---|
| 12:00 AM | 1:00 AM | — |
| 1:00 AM | 2:00 AM | — |
| 2:00 AM | 3:00 AM | — |
| 3:00 AM | 4:00 AM | — |
| 4:00 AM | 5:00 AM | — |
| 5:00 AM | 6:00 AM | — |
| 6:00 AM | 7:00 AM | — |
| 7:00 AM | 8:00 AM | — |
| 8:00 AM | 9:00 AM | CAT only |
| 9:00 AM | 10:00 AM | Both zones |
| 10:00 AM | 11:00 AM | Both zones |
| 11:00 AM | 12:00 PM | Both zones |
| 12:00 PM | 1:00 PM | Both zones |
| 1:00 PM | 2:00 PM | Both zones |
| 2:00 PM | 3:00 PM | Both zones |
| 3:00 PM | 4:00 PM | Both zones |
| 4:00 PM | 5:00 PM | GMT only |
| 5:00 PM | 6:00 PM | — |
| 6:00 PM | 7:00 PM | — |
| 7:00 PM | 8:00 PM | — |
| 8:00 PM | 9:00 PM | — |
| 9:00 PM | 10:00 PM | — |
| 10:00 PM | 11:00 PM | — |
| 11:00 PM | 12:00 AM next day | — |
What GMT and CAT Actually Are
GMT — Greenwich Mean Time
The UK and Ireland in winter, plus Iceland, Portugal and much of West Africa. Standing at UTC as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, October 25, 2026, to GMT. Often used loosely as a synonym for UTC. They differ by less than a second, so for scheduling they are interchangeable.
Britain ran an experiment from 1968 to 1971 on permanent UTC+1, abandoning GMT entirely. It was scrapped after complaints about dark winter mornings in Scotland.
CAT — Central Africa Time
Harare, Lusaka, Maputo, Khartoum. Standing at UTC+2:00 as written, and the region does not change its clocks, so that offset holds all year.
Central Africa Time has never used daylight saving. Near the equator the length of the day changes so little that there would be nothing to shift.
What This Means in Practice
This gap is not fixed
GMT changes its clocks and CAT does not, so the difference between them moves by an hour twice a year. A recurring meeting set now will drift for one side from Sunday, October 25, 2026 unless someone resets it.
Close enough to share a working day
At only 1 hour apart, the two working days overlap almost completely. Scheduling is barely constrained by the difference.
Major Cities in Each Zone
Cities on GMT
Cities on CAT
Frequently Asked Questions
What is the time difference between GMT and CAT?
CAT is 1 hour ahead of GMT. That is the live figure. Taken strictly as written, the gap between GMT and CAT is 2 hours — the two differ because at least one of these regions is currently on daylight saving.
What is 9:00 AM GMT in CAT?
9:00 AM GMT is 10:00 AM CAT.
What are the best hours to schedule a call between GMT and CAT?
Between 9:00 AM and 4:00 PM GMT, which is 10:00 AM to 5:00 PM CAT. Both sides are inside normal business hours through that window.
Does the difference between GMT and CAT change during the year?
Yes. GMT observes daylight saving and CAT does not, so the gap shifts by an hour at least twice a year. The next clock change is on Sunday, October 25, 2026.
Does GMT always mean Greenwich Mean Time?
Often used loosely as a synonym for UTC. They differ by less than a second, so for scheduling they are interchangeable.