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Epoch ↔ Date Converter
One value per line: a Unix timestamp (seconds, or milliseconds when ≥ 10¹¹) becomes an ISO-8601 UTC date; an ISO/RFC date becomes epoch seconds and milliseconds. 1700000000 ↔ 2023-11-14T22:13:20.000Z.
A little guidance. A better result.
How to use Epoch ↔ Date Converter
Unix seconds/milliseconds ↔ ISO-8601 UTC, one per line — 1700000000 ↔ 2023-11-14T22:13:20.000Z.
Prepare your input
Enter Unix timestamps or date strings, one per line.
Use the workspace
Review UTC dates and epoch values.
Check your result
Check seconds versus milliseconds before using the output.
Know the limits
Numeric unit detection uses magnitude. Prefer explicit ISO dates with a timezone for unambiguous conversion.
Where does my input go?
This browser tool processes your input on your device. Optional analytics is a separate choice; it is not needed to use the tool. Keep your original until you have checked the result.
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