Epoch Milliseconds Converter

Epoch time (Unix time, POSIX time) is the number of seconds since January 1, 1970, 00:00:00 UTC. It's the standard way computers store and compare timestamps. Milliseconds add three more digits for finer precision; microseconds add six.

JavaScript uses milliseconds (Date.now()). Many databases and APIs use seconds. This converter handles all three and detects the format automatically based on the number of digits.

Enter an epoch value (seconds, milliseconds, or microseconds) to see the corresponding date in ISO 8601, human-readable form, and relative time. Or enter a date to get the epoch in all three formats. The 'Now' button shows the current time, updating every second.

Common values: 0 = Jan 1, 1970 UTC. 86400 = Jan 2, 1970. 1704067200 = Jan 1, 2024. 2000000000 = May 18, 2033.

0 — Unix Epoch (Jan 1, 1970). 86400 — 1 day later. 31536000 — 1 year (non-leap). 946684800 — Jan 1, 2000. 1704067200 — Jan 1, 2024. 1735689600 — Jan 1, 2025. 2147483647 — 32-bit max (Jan 19, 2038). Multiply by 1000 for milliseconds, 1000000 for microseconds.