7 · 30 · 90-day windows

Global DST and clock change center

See upcoming daylight-saving and UTC-offset changes, filter affected cities, download open data and enable transparent browser alerts.

Filter city or IANA zone

Method and privacy. Time-zone calculations use IANA identifiers through the browser or edge runtime. Inputs remain local unless you explicitly create a share link, vote, or booking. Share records expire automatically. Reviewed 2026-07-29. Sources · Privacy · Accuracy