Time Zone Converter

Convert a date and time between time zones with daylight saving support. Compare offsets and copy ISO/UTC formats.

From
Format: YYYY-MM-DD HH:mm:ss.SSS

Offset: UTC+00:00

Format: YYYY-MM-DD HH:mm:ss.SSS

To
Format: YYYY-MM-DD HH:mm:ss.SSS

Offset: UTC-04:00

Format: YYYY-MM-DD HH:mm:ss.SSS

Details
Convert a date and time between time zones with daylight saving support. Compare offsets and copy ISO/UTC formats.

ISO 8601

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UTC

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Unix timestamp (ms)

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Unix timestamp (s)

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What this tool is for

Use this converter to turn a local date and time in one IANA time zone into the equivalent local time in another zone. It helps when you need to compare schedules across cities without manually adding offsets or guessing whether daylight saving time is active.

Common use cases

  • Checking whether a meeting in Tokyo lands on the same calendar day in New York or London.
  • Verifying offsets before publishing schedules, alerts, or support hours.
  • Copying the matching ISO 8601, UTC, or Unix timestamp values for logs and APIs.

How this converter works

  • Enter a local date and time in YYYY-MM-DD HH:mm:ss.SSS on either side, then choose the source and target time zones.
  • The side you edited most recently becomes the source of truth. The tool converts that instant to UTC internally, then renders the equivalent local time in the other zone.
  • Use Now to fill the current time quickly, or Swap to reverse the comparison. Offsets can change around daylight saving time transitions.