Timestamp tool
Free online timestamp tool: get the current timestamp in seconds or milliseconds, convert between timestamps and dates, and compare times and offsets across time zones. Runs locally in your browser — no data upload.
Features
- Live current timestamp in seconds or milliseconds, one-click copy
- Convert between timestamps and dates (seconds or milliseconds)
- Compare local, UTC and any time zone
- Calculate the offset between any two time zones, all in your browser
How to use
- Copy the second or millisecond timestamp under “Current timestamp”
- Enter a timestamp and unit under “Timestamp to date” to see the time
- Pick a date and time under “Date to timestamp” to get its timestamp
- Choose two time zones under “Timezone difference” to compare time and offset
FAQ
What is the difference between second and millisecond timestamps?
Both count time since 1970-01-01 00:00:00 UTC. A second timestamp has 10 digits; a millisecond timestamp has 13 digits (seconds × 1000).
Why does a timestamp sometimes differ by 8 hours?
A timestamp itself is UTC and timezone-independent; displaying the same timestamp in different zones shifts the time. China (UTC+8) is 8 hours ahead of UTC.
Is my data uploaded to a server?
No — all calculations run locally in your browser, so your timestamps never leave your device.