Timestamp Converter
Convert between Unix timestamp (seconds or milliseconds) and human-readable dates. Auto-detects the format. Shows ISO, UTC, local time and relative distance.
What is a Unix timestamp?
A Unix timestamp (also called epoch time) is the number of seconds that have elapsed since January 1, 1970 UTC, ignoring leap seconds. It's the default way most databases, log formats, and APIs represent points in time because it's unambiguous, timezone-independent, and compact.
Seconds vs milliseconds
Many systems use milliseconds (Unix epoch × 1000) because JavaScript Date and many APIs operate in milliseconds. A rule of thumb: if the number is below ~10^10 it's seconds; above ~10^12 it's milliseconds. This tool auto-detects and converts accordingly.