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Time zone comparison

One instant, every local time.

Enter an exact ISO 8601 instant, choose the zones that matter, and compare the local date, time and offset for that same moment.

  • One exact UTC instant
  • Offsets for the selected date
  • Works in this browser

Choose the instant

Set one unambiguous moment

Use ISO 8601 with Z or a numeric UTC offset. A local clock time without an offset is deliberately rejected so daylight-saving gaps and repeated times are never guessed.

Examples: 2026-01-15T12:00:00Z or 2026-01-15T07:00:00-05:00.

Accepted UTC instant {{ acceptedUtc }}

The initial result is a snapshot from when this page opened. It does not tick automatically.

Add, remove and reorder time zones · Comparison settings

Choose zones

Add, remove and reorder time zones

Search by IANA time-zone ID. UTC is always kept in the comparison.

{{ catalogMessage }}

Suggestions

No matching suggested IDs. You can still try the complete IANA ID.

  1. {{ zone }} Reference

Compare

Local times for the same instant

Every row is calculated from the accepted UTC instant above, using the selected date rather than today’s offset.

{{ t('results.reference', { zone: comparison.referenceZone }) }}

Time zone Local date Local time UTC offset Date vs. reference
{{ row.zone }} {{ t('results.abbreviation', { label: row.abbreviation }) }} Reference
{{ row.date }}{{ row.weekday }}
{{ row.time }}
{{ row.offset }}
{{ relationLabel(row.relation) }}
{{ toast }}