Unix Timestamp Converter
Epoch ↔ human date with timezone selection.
Fill either the numeric epoch or the calendar field. Now fills both.
Enter an epoch or a datetime.
How to use
Type epoch seconds (~10 digits) or milliseconds (~13); auto-detect picks the right unit. Or pick a datetime to derive the epoch the other way.
Now stamps the current instant into both fields—handy when converting timestamps from logs.
The time zone picker updates the human-readable row. The ISO line is always UTC with a `Z` suffix—use it when comparing APIs and databases.
Near the 2038 boundary, 32-bit second epochs can overflow on legacy stacks; prefer milliseconds and 64-bit clocks for long-range planning.