Time Zone Converter
Converting a time across time zones is really just adding and subtracting UTC offsets — the tricky part is handling the wraparound when the result crosses midnight into the previous or next day.
Inputs
Result
03:30
Same day
How the time zone converter works
Target hour = source hour − source UTC offset + target UTC offset.
If the result falls below 0 or reaches 24 or beyond, 24 is added or subtracted repeatedly until it lands in the normal 0-24 range, and the day shift (previous/next/same day) is tracked separately.
Worked example: 14:00 in India (UTC+5:30) converted to New York (UTC−5:00)
- 14 − 5.5 + (−5) = 3.5, which is 3:30 in 24-hour format.
- No wraparound was needed here since 3.5 already falls within 0-24, so the result is 03:30, same day.
Common mistakes to avoid
Forgetting some time zones use half-hour or quarter-hour offsets
Not every time zone is a whole-hour offset from UTC — India (UTC+5:30) and parts of Australia and Iran use half or even quarter-hour offsets, which need to be entered as decimals (5.5, not 5) for an accurate conversion.
Not accounting for daylight saving time changes
UTC offsets for many regions shift by an hour during daylight saving periods — this calculator uses whatever fixed offset is entered, so the correct current offset (which may differ from a region's 'standard' offset) needs to be checked separately for the specific dates involved.
Frequently asked questions
Why does the result sometimes say 'Next day' or 'Previous day'?
Converting between time zones can push the clock time past midnight in either direction — if the calculated hour would be negative or 24 or more before wraparound, the actual calendar date shifts by one day relative to the source date.
How do I find a specific location's current UTC offset, accounting for daylight saving?
This varies by season and location — checking a current, region-specific reference for the exact dates in question is the reliable way to get the correct offset, since it can differ from the 'standard' offset for parts of the year.
Why is UTC used as the reference point rather than a specific country's time?
UTC (Coordinated Universal Time) doesn't observe daylight saving and isn't tied to any single country, making it a stable, unambiguous reference point that every other time zone's offset is defined relative to.
Can this handle converting across the International Date Line?
The underlying hour-wraparound math handles any offset difference correctly, including large ones that cross the date line, correctly identifying whether the result lands on the previous or next calendar day.
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