A LITTLE ORDER, A LOT LESS WORK.
Timestamp Converter
Distinguish seconds from milliseconds and inspect UTC and local time.
01 — 18Start with data. Make room for work.
Batch processing available
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Results will appear here
ONE OPERATION, MULTIPLE FILES
Do repeated work in one pass.
Files use the options above. Up to 10 files, 2 MiB each.
Files stay on your device. Download each result independently.
No files selected.
All processing happens in this browser.
How to use it
- Choose seconds or milliseconds explicitly before converting a timestamp.
- For the reverse conversion, use an ISO timestamp with a timezone, such as 2026-10-25T12:00:00+08:00.
- Results include UTC, the browser timezone, seconds and milliseconds.
Why are displayed times different?
Different timezones can display the same instant differently.
Are negative timestamps supported?
Yes. They represent times before 1970-01-01T00:00:00Z.