Time Zone Converter
Convert a time from one time zone to another using UTC offsets.
Inputs
Converted Time
01:00
Day
next day
Step by step
Input time and source zone
14:30 in UTC−05:00 (EST)
Shift to UTC (subtract source offset)
870 min − (-300 min offset) = 1170 min since midnight UTC
Negative UTC minutes are valid — they indicate a time before midnight UTC.
Shift from UTC to target zone (add destination offset)
1170 min + (330 min offset) = 1500 min
= 01:00 UTC+05:30 (IST)
Result crosses midnight — reported as the next day.
How it works
The source time is first shifted to UTC by removing its offset, then shifted again by the destination offset. If the result crosses midnight, the day indicator shows whether it lands on the previous or next day.
Formula
UTC time = source time (minutes) − source UTC offset (minutes). Target time = UTC time + destination UTC offset (minutes). If target < 0, add 1440 (previous day); if target ≥ 1440, subtract 1440 (next day).
- 1440
- Minutes in a day — used to wrap times that cross midnight
- source offset
- Minutes east of UTC for the source zone (negative for west)
- destination offset
- Minutes east of UTC for the target zone
Frequently Asked Questions
Does this handle daylight saving time?
It uses fixed UTC offsets, so pick the offset that matches the date in question (for example PST vs PDT). It does not auto-adjust for DST transitions.
Why UTC offsets instead of city names?
Offsets keep the tool fast and fully offline. Choose the offset label that matches your city's current standard or daylight time.