Converters
Convert a time of day between two UTC offsets — the result shows whether the target time falls on the same, previous, or next day.
Results update as you type. No calculate button. All calculations run locally in your browser.
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Offsets are fixed numbers of hours from UTC. They do not encode daylight-saving rules, which change by place and date.
Target time = source time − source UTC offset + target UTC offset, wrapped to 24 hours. In minutes: target minutes = hour × 60 + minute − source offset × 60 + target offset × 60; if the result is negative, add 1,440 (24 hours) and count one day earlier; if it reaches 1,440 or more, subtract 1,440 and count one day later.
Offsets in the dropdowns are standard-time examples for the named places. Several places shift by one hour during daylight saving, and governments occasionally change offset rules — the offset that applies on a specific date must be confirmed with an official source for that place and date.
09:00 at UTC+8 is 9 × 60 = 540 minutes; 540 − 480 (UTC+8) + (−300) (UTC−5) = −240 minutes. Adding 1,440 gives 1,200 minutes = 20:00, one day earlier — so 09:00 in Beijing is 20:00 the previous day in New York standard time.
This page converts times of day using fixed UTC offsets only. It does not know dates, daylight-saving transitions, or historical offset changes, and it cannot tell you whether a given place observes daylight saving on a given date. For scheduling, confirm the offset for the actual date with an official source. Times are given to the minute; seconds are not handled.
No. The offsets are fixed numbers. A place on daylight saving is typically one hour ahead of its standard offset — for example New York is UTC−4 on daylight saving instead of UTC−5. Check the offset for your actual date.
Because subtracting the offsets can push the time before midnight. 09:00 in Beijing is still the previous evening in New York — the day shift makes that explicit instead of silently showing 20:00.
They are included: UTC+05:30 (India) and UTC+09:30 (Adelaide, standard) are in the dropdowns, and the formula works in minutes so they convert exactly.
Not on this page: it converts a time of day plus a day shift. For a dated event, apply the day shift to your date by hand and confirm daylight saving for that date.
London is UTC+00:00 in winter and UTC+01:00 (British Summer Time) in summer. The dropdown gives the standard offset; pick +01:00 for summer dates.
Results are estimates only and do not constitute professional advice.