Time Zone Converter
Convert time between world time zones instantly.
Select two cities or UTC offsets and see the converted time and hour difference.
Time zones divide the world into regions that observe the same standard time. The system is based on Coordinated Universal Time (UTC), with each zone offset by a certain number of hours (and sometimes half-hours) from UTC. For example, New York operates on UTC-5 during standard time, while Tokyo is UTC+9, making Tokyo 14 hours ahead of New York in winter.
This calculator lets you convert a time from one zone to another by selecting the UTC offsets for both locations and entering your local time. The conversion formula is straightforward: take the source time, subtract the source UTC offset, then add the destination UTC offset. If the result goes past midnight (above 24 or below 0), the calculator adjusts the time and indicates a day change.
Understanding time zones is essential for international travel, scheduling calls across continents, coordinating business meetings, and catching live events broadcast from other countries. There are roughly 38 distinct time zone offsets in use worldwide, including unusual ones like UTC+5:30 (India), UTC+5:45 (Nepal), and UTC+9:30 (Central Australia).
Daylight saving time (DST) adds complexity, as many regions shift their clocks forward by one hour during summer months. Not all countries observe DST, and those that do may change on different dates. This calculator uses standard UTC offsets, so during DST periods you may need to adjust the offset by one hour for affected regions.
When planning international travel or meetings, always confirm whether DST is currently in effect for both locations. A good rule of thumb is to convert everything to UTC first, then to your target zone, which is exactly what this calculator does behind the scenes.