What this calculator does

This time zone converter changes a date and time from one UTC offset to another. It is useful for calls, releases and travel planning when you know the offsets.

Formula used

The input time is converted to UTC by subtracting the source offset, then converted to the target offset by adding the target offset.

How to read the result

UTC offsets do not automatically handle daylight saving time. Choose the offset that applies on the date you are converting.

Assumptions

  • Uses fixed UTC offsets.
  • Does not look up city daylight saving rules.
  • Shows the converted date when the time crosses midnight.

Sources and checks

This calculator uses a standard public formula. Where rules or thresholds can change, source links are listed on the relevant page.

Frequently asked questions

Why use UTC offsets instead of city names?

Offsets are clear and lightweight. City names need a timezone database because daylight saving rules change by date and location.