Unix Time Converter (Seconds/Milliseconds ↔ Date)
Convert Unix time (unixtime) to date/time and back in seconds or milliseconds.
Input & Output
Unix time (seconds/milliseconds) → Date
Date → Unix time (seconds/milliseconds)
Interpret the input as this timezone
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Batch conversion (multiple lines)
Paste one value per line. Whitespace, tabs, and commas are supported.
Batch conversion (multiple lines)
Paste one value per line. Whitespace, tabs, and commas are supported.
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Paste a Unix time or a date/time
Check unit and timezone
Copy the result
All conversions run in your browser.
Unix time → date
Date → Unix time
Notes & Tips
Unix time basics
Quick reminders about digits and timezones.
Unix time basics
Quick reminders about digits and timezones.
What is Unix time?
- Unix time (epoch seconds) is the number of seconds since 1970-01-01 00:00:00 UTC.
- Milliseconds are 1000× seconds and are often 13 digits in logs or APIs.
10 vs 13 digits
- 10 digits usually means seconds; 13 digits means milliseconds.
- Seconds will grow in digits over time, so a manual switch is provided.
Timezone notes
- Unix time is always UTC-based.
- Display can be Local/JST/UTC.
- For date → Unix, the input timezone matters.
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Frequently asked
Common questions about digits, timezones, and ISO format.
Frequently asked
Common questions about digits, timezones, and ISO format.
10 digits or 13 digits?
We auto-detect (10 digits = seconds, 13 digits = milliseconds). You can manually switch if needed.
What about timezone?
Switch Local / JST / UTC for display. For date → Unix, you can also choose which timezone the input should be interpreted as.
I need ISO format
ISO 8601 output is available (e.g., 2026-01-31T12:34:56+09:00 or ...Z for UTC).
How to get the current Unix time quickly?
Use the Now button to fill the current time in seconds or milliseconds.
Can I convert multiple values?
Use Batch conversion to paste multiple lines at once.