Is DST Transition Checker free?

Yes, DST Transition Checker is completely free to use with no signup required.

Does DST Transition Checker send my data to a server?

No. DST Transition Checker runs entirely in your browser using client-side JavaScript. Your data never leaves your device.

Analyze named timezones for daylight saving time (DST) shifts. Locates exact transition hours offline.

DevTab

Never leaves your browser

Audit daylight saving time transition offsets and dates for named timezones client-side.

Select Year

Named Timezone

DST Transition Audit Summary

No DST transitions found for this timezone in 2026.
Offset remains constant throughout the year.

Transitions AuditedZone: America/New_York | Year: 2026