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Sommerzeit-Prüfer

Prüfen Sie Sommerzeit-Status und Umstellungstermine für jede Region.

Check a zone for a year

Next clock change in this zone

Funktionsweise

  1. The checker samples the chosen zone at every month boundary of the selected year and binary-searches between samples to find every offset change, including zones that change more than twice a year (such as Morocco’s Ramadan-related shifts).
  2. Each change is reported with the exact local date and time of the jump and both offsets (for example, clocks jump from 02:00 to 03:00, UTC−05:00 → UTC−04:00).
  3. A second panel scans forward from now for the zone’s next upcoming change, so you can see how long the current offset lasts.

Gut zu wissen

  • Many zones never change: most of Asia and Africa have no DST. The tool reports what the rules actually are for the zone you pick, not an assumption.
  • Transition times come from the IANA database built into your browser. Governments can change the rules, so re-check future years when a schedule matters.
  • Year range is 1900–2200; earlier history exists but old rules were local laws rather than systematic data.
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Häufig gestellte Fragen

Does every country observe daylight saving time?
No. Most of Asia and Africa do not; the EU and North America, among others, do, and transition dates differ. This tool reports actual rules for the chosen zone.
What exactly does the tool show for a clock change?
The transition instant and both offsets (e.g. clocks jump from 02:00 to 03:00 local, or fall back). The exact minute and date come from your browser IANA database.
Why check a specific year?
DST rules are set by governments and do change. Checking the year you actually care about (e.g. next year’s meeting schedule) protects you from stale assumptions.