Unix timestamp converter

About Unix timestamp converter

Convert Unix timestamps to human-readable dates and back, with auto seconds/ms detection, timezone display, batch paste, and relative time.

Log files and APIs disagree about seconds versus milliseconds. Values above 9,999,999,999 are treated as milliseconds; otherwise seconds. The detected unit is shown so you are not guessing.

The datetime picker writes a timestamp from this browser's local clock. The timezone selector only changes how the absolute time is displayed — Unix time itself is UTC-based.

Batch mode accepts one timestamp per line and builds a table with absolute and relative columns. Relative strings use Intl.RelativeTimeFormat (“3 days ago”, “in 2 hours”).

How to use Unix timestamp converter

1. 1Paste a timestamp or click Now (seconds) / Now (ms).
2. 2Optionally change the display timezone.
3. 3For logs, paste many timestamps into Batch and read the table.

What it won't do

• ·Datetime-local input uses the browser's local zone, not an arbitrary IANA zone for entry.
• ·Leap seconds are not modeled; Date math is ordinary ECMAScript time.

Common questions

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