Timestamp -> ISO
2026-08-18T15:02:45.779Z
Timestamp Converter
Convert Unix timestamps in seconds or milliseconds to ISO date format and back.
Free · no login · browser-based
Converter
Results
ISO -> Unix seconds
1787065365
ISO -> Unix milliseconds
1787065365779
How it works
The converter reads Unix timestamp input (seconds or milliseconds), normalizes to milliseconds, and formats an ISO date. It also parses ISO input back to Unix values.
Formula
if timestamp < 10^10: milliseconds = timestamp * 1000
iso = new Date(milliseconds).toISOString()Useful for debugging logs, API payloads and event correlation across systems.
Example
Input 1710000000 converts to a UTC ISO timestamp; entering ISO converts back to Unix seconds and milliseconds.
FAQ
Does this use UTC?
Yes, ISO output is generated in UTC format.
Can I paste milliseconds directly?
Yes, both seconds and milliseconds are supported.
Is timezone conversion included?
Not in this version; focus is Unix/ISO conversion.