Dev / Time
Timezone Converter.
Pick a wall-clock date and time as it would read on a clock in the first timezone — then see that same instant in the second. DST rules come from your browser's IANA zone data.
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IANA zones
Zones like America/New_York encode DST rules. Offsets alone (UTC+5) do not. This tool lists zones your browser supports via Intl.supportedValuesOf when available.
Further reading: ISO 8601 vs Unix epoch.