Time Difference: Port-au-Prince vs London

Port-au-Prince (GMT-4) · London (GMT+1)

Port-au-Prince

GMT-4

--:--:--

London

GMT+1

--:--:--

London and Port-au-Prince are in the same UTC offset

Time Difference

Port-au-Prince Offset

GMT-4

America/Port-au-Prince

London Offset

GMT+1

Europe/London

Summary

Port-au-Prince and London share the same UTC offset

Business Hours Overlap (9 AM – 6 PM)

9 hours overlap during standard business hours in both cities.

Port-au-Prince	London	Overlap
9 AM	9 AM	Business hours
10 AM	10 AM	Business hours
11 AM	11 AM	Business hours
12 PM	12 PM	Business hours
1 PM	1 PM	Business hours
2 PM	2 PM	Business hours
3 PM	3 PM	Business hours
4 PM	4 PM	Business hours
5 PM	5 PM	Business hours
6 PM	6 PM	Outside

Did You Know? — Port-au-Prince & London

Time Zone Facts: Port-au-Prince

•Uses Port-au-Prince time, part of North American timezone system
•Part of the Americas business timezone chain
•Tropical latitude: Port-au-Prince has about 11–13 hours daylight depending on season

Time Zone Facts: London

•London sits on the Prime Meridian at 0° longitude, which is why Greenwich Mean Time (GMT/UTC+0) became the world's reference timezone in 1884 at the International Meridian Conference.
•The London Stock Exchange opens at 8:00 AM GMT and closes at 4:30 PM GMT, making London's morning the global overlap window where both European and (briefly) US pre-market traders are active.
•At 51.5°N — further north than most of Canada — London receives only about 7.5 hours of daylight at winter solstice but enjoys over 16.5 hours of daylight in midsummer.

Frequently Asked Questions

Port-au-Prince and London are in the same time zone offset, so there is no time difference between them.

There are 9 overlapping business hours (9 AM–6 PM) between Port-au-Prince and London. Scheduling during those hours ensures both parties are in their working day.

Port-au-Prince and London share the same UTC offset (GMT-4), so their workdays are completely synchronized — no conversion needed, identical real-time availability, and deadline alignment is automatic.

Port-au-Prince observes GMT-4 (America/Port-au-Prince). A standard 9:00 AM–6:00 PM workday in Port-au-Prince maps to specific UTC hours — use UTC-anchored deadlines when coordinating with Port-au-Prince-based teammates to avoid confusion from local clock changes.

London observes GMT+1 (Europe/London). A standard 9:00 AM–6:00 PM workday in London maps to specific UTC hours — use UTC-anchored deadlines when coordinating with London-based teammates to avoid confusion from local clock changes.

If {cityA} and {cityB} follow different DST schedules — common in North America–Europe, Southern Hemisphere, or no-DST pairings — the time difference shifts by 1 hour during each transition. The 1–3 weeks between the two cities' clock-change dates create a 'gap window' that frequently catches teams off guard. The difference displayed here is always live and accounts for current DST status.

The best time to call London from Port-au-Prince is during the 9-hour business-hours overlap window, when both cities are within their standard working day (9 AM–6 PM).

When it is midnight (00:00) in Port-au-Prince, it is 12 AM in London.

No — Port-au-Prince and London share the same UTC offset, so they are always on the same calendar date.

Port-au-Prince observes America/Port-au-Prince (GMT-4). For async-first teams, the most reliable approach is anchoring shared deadlines in UTC rather than any local time, and defining each member's 'availability window' — typically 9:00 AM–6:00 PM America/Port-au-Prince for Port-au-Prince. This eliminates confusion when DST transitions shift local clocks seasonally.

London observes Europe/London (GMT+1). For async-first teams, the most reliable approach is anchoring shared deadlines in UTC rather than any local time, and defining each member's 'availability window' — typically 9:00 AM–6:00 PM Europe/London for London. This eliminates confusion when DST transitions shift local clocks seasonally.

Yes — with 9 hours of overlapping business hours, Port-au-Prince and London teams can hold real-time standups and synchronous collaboration daily during that window.