123024.com · Unix Timestamp

Unix Timestamp Converter

A Unix timestamp is the number of seconds or milliseconds since 1970-01-01 00:00:00 UTC. It shows up everywhere in APIs, logs, cache expiry, and cross-timezone work. This tool shows a live clock and converts both ways between timestamps and readable dates.

When to use it

Debug createTime / expireAt fields from APIs, align with server log times, turn database epoch values into readable dates, or quickly spot timezone skew during front/back-end integration.

Second-level timestamps are usually 10 digits; millisecond ones are often 13. Mixing them up is a common cause of broken times in production — confirm the unit before converting.

How to use

The page shows your current local time and the matching timestamp. Paste a timestamp to get a date, or build a timestamp from a date. All math runs in your browser; time data is never sent to a server.

Tips

10 digits are usually seconds; 13 are usually milliseconds — check the unit first.
For cross-timezone work, prefer UTC or label the zone clearly to avoid “off by 8 hours” mistakes.