Is the timestamp in seconds or milliseconds?

JavaScript Date.now() is milliseconds (13 digits); many backends use seconds (10)—this tool detects length and shows both.

Why does the same timestamp look different per timezone?

A timestamp is one UTC instant—local clocks differ by zone; pick a timezone to compare.

32-bit seconds overflow around 2038 (Y2K38); common positive timestamps are supported here.

Real-time Unix timestamp, updates every second

Seconds

1788589889

Milliseconds

1788589889800

Convert Unix timestamp to human-readable date and time

Enter Timestamp

Unit

Seconds

Milliseconds

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