Guide
Unix Timestamp Converter — complete guide
What is a Unix timestamp?
A Unix timestamp (epoch time) counts seconds — or sometimes milliseconds — since 1 January 1970 UTC. APIs, databases, and logs often store time this way because it is compact and timezone-agnostic at rest.
The Unix Timestamp Converter on space4.dev converts epoch values to human-readable dates and back, including common second vs millisecond confusion.
How to convert Unix time online
Typical tasks:
- Paste an epoch number to see the matching calendar date and time.
- Enter a date to generate a Unix timestamp for APIs or SQL seeds.
- Check whether your value is in seconds (10 digits) or milliseconds (13 digits).
- Compare results across time zones with the Time Zone Converter when needed.
Developer use cases
Debug JWT exp claims, interpret cloud log lines, set cache TTLs, or translate analytics event times — without opening a spreadsheet or writing a one-off script.