Unix Timestamp Converter
Convert Unix time to ISO-8601 UTC and the other way around.
Your input stays in your browser. Nothing is uploaded.
About this tool
Unix time is seconds since 1970-01-01T00:00:00Z. Values with 13+ digits are treated as milliseconds.
How it works
Enter a timestamp or an ISO date. Conversion is instant and local.
Date = new Date(seconds * 1000)
Examples
0
Unix 0 is 1970-01-01T00:00:00.000Z.
FAQ
Local time or UTC?
ISO output is UTC (the Z suffix).
Milliseconds?
If the absolute value is ≥ 1e12, it is treated as milliseconds.