Date & time
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Calculators / Date & time / Time-zone offset
Time-zone offset calculator
Convert an hour using a signed offset between two time zones.
On this page
Unwrapped target hour15hours
Calculator controls
How to calculate
Convert an hour using a signed offset between two time zones.
Unwrapped target hour = hour+offset
Worked example
Starting hour (0–23): 12; Target minus source offset (hours): 3.
Unwrapped target hour: 15 hours.
Assumptions and limits
If the result is below 0 or at least 24, wrap it into the previous or next day. Daylight-saving rules can change offsets by date.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Convert an hour using a signed offset between two time zones. The displayed figures use the inputs and formula shown on this page.
When this tool is useful
Use the time-zone offset to compare a scenario, check an estimate, or verify a manual calculation.
Understanding your inputs
| Input | What to enter |
|---|---|
| Starting hour (0–23) | Enter a number of at least 0 and no more than 23. |
| Target minus source offset (hours) | Enter a number of at least -24 and no more than 24. |
Frequently asked questions
What should I check before using the time-zone offset result?
If the result is below 0 or at least 24, wrap it into the previous or next day. Daylight-saving rules can change offsets by date.
Is this time-zone offset result exact?
It is exact for the stated mathematical model and entered values. Real-world results can differ when rates, timing, fees, definitions or measurement conditions differ.