TimeStopwatch

UTC / GMT Converter

Convert local time to UTC (GMT) and back. Live UTC clock included.

Current UTC
Your local time
= UTC

Convert between your local time and Coordinated Universal Time (UTC), the world's time reference. Includes a live UTC clock that ticks every second.

How it works

JavaScript's `Date.toISOString()` returns UTC directly. To convert local → UTC we parse your input, apply your local offset (accounting for DST) and format the result in ISO 8601.

Key features

  • Live UTC clock
  • Local timezone displayed
  • ISO 8601 output
  • Datetime input for arbitrary conversion

Common use cases

API development
Most APIs use UTC — quickly convert local test times.
Log analysis
Server logs are almost always UTC; convert them to your local time for readability.
International coordination
Announcing an event? UTC removes all ambiguity.

Pro tips

  • ◆Always store timestamps as UTC in databases. Convert only at the presentation layer.

Common mistakes to avoid

  • ✕Confusing UTC with your local time on a machine that's misconfigured to run in UTC.

Frequently asked questions

What does UTC stand for?▼

Coordinated Universal Time. The abbreviation is deliberately language-neutral.

Is UTC the same as GMT?▼

Effectively yes for civilian use.