Batch Unix Timestamp Converter

Paste timestamps, one per line. Seconds (10-digit) and milliseconds (13-digit) are auto-detected.

About this tool

Paste a whole column of Unix timestamps and convert them all at once. Each line is parsed independently: a 13-digit value is treated as milliseconds and a 10-digit value as seconds, so mixed lists work fine. Blank lines are ignored and unparseable lines are flagged.

Dates are shown in your browser's local time zone. Copy the whole tab-separated table for pasting into a spreadsheet. Runs entirely in your browser — nothing is uploaded.

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