Timestamp Converter
Convert Unix timestamps, milliseconds, and ISO 8601 dates in both directions. See UTC and local time side by side, generate a 'now' epoch, and copy values for logs, databases, and APIs without a round trip to a conversion API.
Runs in your browser. Nothing is uploaded.
About this tool
Convert Unix time (seconds or milliseconds) and ISO 8601 strings in both directions. Empty input follows the live clock; Now buttons stamp seconds or milliseconds. Local formatting uses Intl and your resolved IANA time zone so 'what is this epoch?' does not require a time API.
How to use: paste a 10-digit or 13-digit epoch, or an ISO string. Read UTC, local, and relative fields, then copy any single value or the whole summary from the tool chrome. Swap if you want to take a formatted time back into the input.
Example: 1710000000 becomes a calendar date; a JWT exp claim pasted here shows whether the token is still in its window. Handy for log lines and database epoch columns.
Conversion is Date math in the browser. There is no time API round trip, so internal event timestamps stay private. Related: JWT decoder for exp/iat, hash generator if you only needed a fingerprint.
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