Time Zone Difference Estimate Calculator
Enter the UTC offsets of two time zones to calculate the hour difference between them.
Time Zone Difference Estimate Calculator
Calculates the hour difference between two time zones from their UTC offsets.
This calculator simply subtracts one UTC offset from another to find the hour difference between two time zones, which is useful for scheduling calls, flights, or any coordination across regions. Because many regions shift their UTC offset for daylight saving time during part of the year, be sure to enter each zone's currently active offset (not just its standard-time offset) for an accurate difference.
Example
- With the default values shown above, this calculator returns: Hour Difference (B minus A) ≈ 6 hours.
Frequently Asked Questions
What does a positive result mean?
A positive result means Time Zone B is ahead of Time Zone A by that many hours; a negative result means B is behind A.
Does this account for daylight saving time?
No — enter the UTC offsets that are currently in effect for each location (including any daylight saving adjustment) rather than the standard-time offset, since offsets can shift twice a year in regions that observe DST.
Sources
- Standard formula, publicly documented method