WorldTime Grid tool

International Date Line Visualizer

See how one instant maps to the previous, same or next date across regions.

Honolulu

Tuesday, 2026-06-30 12:00

Same day
Auckland

Wednesday, 2026-07-01 10:00

Same day
Seoul

Wednesday, 2026-07-01 07:00

Same day
Los Angeles

Tuesday, 2026-06-30 15:00

Same day
London

Tuesday, 2026-06-30 23:00

Same day

Method and limitations

This tool uses named IANA time zones and calculates the applicable offset for the selected date. Time-zone rules can change, browser data versions can differ, and important future events should be confirmed in participants’ calendars.

No account or server database is required. Values entered into the calculator remain in the browser unless you deliberately create and share a URL.