Time Zone Difference Calculator
Time Zone Difference
Calculate the hour difference between two time zones
Formula
Difference = Zone 2 UTC Offset - Zone 1 UTC Offset
Frequently Asked Questions
How do I calculate the time difference between two cities?
Find each city's UTC offset and subtract them. For example, New York (UTC-5) and London (UTC+0) differ by 5 hours. London is 5 hours ahead of New York.
Do time zone differences change with daylight saving time?
Yes. When one region observes DST and the other does not, the effective difference changes by 1 hour. For example, the UK-US Eastern difference is normally 5 hours but can be 4 or 6 during DST transition periods.
What are half-hour and quarter-hour time zones?
Some regions use offsets that are not whole hours. India is UTC+5:30, Nepal is UTC+5:45, Iran is UTC+3:30, and parts of Australia use UTC+9:30.
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