⏱️Unix Timestamp ↔ Date
Convert Unix timestamps (seconds or milliseconds) to human-readable dates and back. Supports ISO 8601, local, and UTC display. Useful for database log analysis, API debugging, checking cookie/JWT expiry, and timezone conversion work.
How to use
- 1Enter timestamp or date.
- 2Choose unit (s/ms) and display format (local/UTC/ISO).
- 3Result appears instantly.
FAQ
Seconds vs milliseconds?+
Unix standard uses seconds (10 digits); JavaScript Date uses milliseconds (13 digits). The tool auto-detects by digit count.
Why use Unix timestamps?+
It's a timezone- and locale-independent way to represent time — counting seconds since Jan 1, 1970 UTC.
What's the 2038 problem?+
32-bit signed integers representing seconds overflow on Jan 19, 2038 03:14:08 UTC. Systems using 64-bit are safe.
Current timestamp?+
The tool shows 'now' automatically and refreshes on reload.
How is timezone applied?+
The timestamp itself is absolute UTC. Display converts to the browser's timezone (KST in Korea).
ISO 8601 format common in JSON?+
Like 2026-05-17T15:30:00.000Z. The 'Z' means UTC time.