All tools on TimestampDecode
Everything on this site runs 100% in your browser. No uploads, no accounts, nothing sent anywhere.
TimestampDecode (main tool)
Free, 100% client-side Unix timestamp and epoch converter. Convert epoch seconds and milliseconds to ISO-8601, UTC, and local time.
Epoch Unit Detector (s, ms, µs, ns)
Paste epoch timestamps and see whether each is seconds, milliseconds, microseconds or nanoseconds, with the date it resolves to. Catches the off-by-1000 mistakes that land in 1970. Runs in your browser.
ISO-8601 to Epoch Converter
Convert ISO-8601 dates and date-times to Unix seconds and milliseconds. A time with no offset shows both its UTC and local readings instead of guessing, and impossible dates like 2026-02-30 are rejected, not rolled over.
Looking for explanations rather than a tool? TimestampDecode guides cover 2 worked examples and gotchas.
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