Time zone converter

Convert dates and times between IANA time zones

From

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

Time zone
UTC

Offset: UTC+00:00

To

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

Time zone
America/New_York

Offset: UTC-05:00

Details

ISO 86012026-01-01T12:00:00.000Z
UTCThu, 01 Jan 2026 12:00:00 GMT
Unix timestamp (ms)1767268800000
Unix timestamp (s)1767268800

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 field you edited most recently is used as the source. The tool converts that instant to UTC, then shows the equivalent local time in the other time zone.
  • Use Now to fill the current time quickly, or Swap to reverse the comparison. Offsets can change around daylight saving time transitions.

How to use

Enter a local date and time on either side, choose both IANA time zones, then use the automatically converted value and copy the timestamp format you need.