Time Zone Converter
Convert a time from one time zone to another. Supports UTC offsets for all major world time zones quickly and accurately.
Converted Time (24h)
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Converted Time (12h) —
Day Change —
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Result (24h)
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Result (12h) —
Day Change —
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UTC Time
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New York (UTC−5) —
London (UTC+0) —
Paris (UTC+1) —
Moscow (UTC+3) —
Mumbai (UTC+5:30) —
Beijing (UTC+8) —
Tokyo (UTC+9) —
Sydney (UTC+10) —
Auckland (UTC+12) —
How to Use This Calculator
- Enter the source hour and minute.
- Select the source UTC offset (the time zone the time is in).
- Select the target UTC offset (the time zone to convert to).
- The converted time is shown in both 24-hour and 12-hour formats.
Formula
UTC time = Source time − Source offset
Target time = UTC time + Target offset
Example
Example: 3:00 PM New York (UTC−5) → London (UTC+0) = 8:00 PM.
Frequently Asked Questions
- The converter uses UTC offsets to translate a local time into another time zone. The formula is: Target time = Source time − Source offset + Target offset. The calculator first converts your source time to UTC (subtract the source offset), then adds the target offset to get the local time in the destination zone. If the result crosses midnight it wraps around, and the day-change indicator tells you whether the converted time is on the previous or next calendar day. For example, 9:00 PM in New York (UTC−5) becomes 2:00 AM the next day in London (UTC+0), a shift of +5 hours.
- Eastern Standard Time (EST) is UTC−5, in effect from the first Sunday in November through the second Sunday in March. During summer, Eastern Daylight Time (EDT) applies at UTC−4. Central Standard Time (CST) is UTC−6 (CDT is UTC−5). Mountain Standard Time (MST) is UTC−7 (MDT is UTC−6). Pacific Standard Time (PST) is UTC−8 (PDT is UTC−7). Alaska is UTC−9 in standard time. Hawaii does not observe DST and stays at UTC−10 year-round. Always verify the current offset for the specific date, because DST rules change year to year.
- London follows two offsets during the year. Greenwich Mean Time (GMT/UTC+0) applies in winter, from the last Sunday in October until the last Sunday in March. British Summer Time (BST, UTC+1) applies in summer. Other major European cities: Paris/Berlin/Rome use CET (UTC+1) in winter and CEST (UTC+2) in summer. Moscow uses UTC+3 year-round (no DST since 2014). When scheduling calls with London, remember to check which side of the DST boundary the date falls on, as the US and UK switch DST on different dates, creating a brief window where the offset between New York and London changes.
- Yes — India Standard Time (IST) is UTC+5:30, which is a half-hour offset. Select UTC+5:30 from the dropdown or enter 5.5 as the decimal offset. India does not observe daylight saving time, so this offset is constant year-round. For example, 12:00 PM in London (UTC+0) is 5:30 PM in Mumbai. Other notable half-hour and quarter-hour offsets: Iran is UTC+3:30, Afghanistan is UTC+4:30, Myanmar is UTC+6:30, and Nepal is UTC+5:45. These fractional offsets are often missed when doing quick mental arithmetic, so the calculator handles them precisely.
- The calculator uses fixed UTC offsets that you select manually. It does not automatically apply DST rules based on the date. This means you are responsible for choosing the correct seasonal offset. In the US, DST starts the second Sunday in March (clocks spring forward one hour) and ends the first Sunday in November (clocks fall back). In the EU, DST starts the last Sunday in March and ends the last Sunday in October. If you are converting a time in July for a US location, select UTC−4 for EDT rather than UTC−5 for EST. A common mistake is using the standard-time offset in summer, causing a one-hour error.