Epoch / Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates instantly. Everything runs in your browser.
Current Unix Timestamp
Timestamp → Date
UTC
Local
ISO 8601
Relative
Day of week
Week of year
Date → Timestamp
What Is a Unix Timestamp?
A Unix timestamp (also called Epoch time or POSIX time) is the number of seconds that have elapsed since January 1, 1970 at 00:00:00 UTC — a point in time known as the Unix Epoch. It's the standard way computers represent time internally.
Why Developers Use Unix Timestamps
- Timezone-independent — A Unix timestamp means the same instant everywhere in the world. No timezone ambiguity.
- Easy math — Calculating durations is simple subtraction. "How many seconds between two events?" is just
t2 - t1. - Compact storage — A single integer is smaller and faster to process than a formatted date string.
- Universal — Every programming language and database supports Unix timestamps natively.
Seconds vs. Milliseconds
Traditional Unix timestamps are in seconds. JavaScript and some APIs use milliseconds (13 digits instead of 10). This tool auto-detects which format you enter — if your number has 13+ digits, it's treated as milliseconds.
Common Timestamps
0— January 1, 1970 00:00:00 UTC (the Unix Epoch)1000000000— September 9, 2001 01:46:40 UTC (the "billion seconds" milestone)2000000000— May 18, 2033 03:33:20 UTC (the next billion-second milestone)2147483647— January 19, 2038 03:14:07 UTC (the Y2K38 problem for 32-bit systems)