Seconds vs milliseconds?

10-digit values are usually Unix seconds; 13-digit are milliseconds. Pick the wrong unit and dates shift by 1000×.

Both are shown so you can match UTC server logs with your local debugging clock.

Is Y2038 still a concern?

32-bit second counters overflow in 2038; JS millisecond math in this tool handles far-future dates safely.

Home ToolboxTimestamp Converter

Convert Unix timestamps and datetime. Supports seconds/milliseconds.

Convert Unix timestamps and datetime. Supports seconds/milliseconds with local, UTC, and ISO formats.

Seconds vs milliseconds?: 10-digit values are usually Unix seconds; 13-digit are milliseconds. Pick the wrong unit and dates shift by 1000×.
Local time or UTC?: Both are shown so you can match UTC server logs with your local debugging clock.
Is Y2038 still a concern?: 32-bit second counters overflow in 2038; JS millisecond math in this tool handles far-future dates safely.