Timestamp ↔ Date Converter
Convert Unix seconds/milliseconds to ISO and local dates. Runs entirely in your browser. Nothing is sent to Formsig.
Seconds-
Milliseconds-
ISO (UTC)-
Local-
About this tool
Convert Unix timestamps in seconds or milliseconds to ISO 8601 and local date strings, or parse a date into Unix time. Useful for logs, webhooks, and API debugging.
Features
- Unix seconds and milliseconds support
- ISO 8601 and local timezone display
- Convert in both directions
- Now button for the current instant
Common use cases
- Reading timestamps from webhook payloads
- Converting log times to human-readable dates
- Building test fixtures with known Unix times
- Checking expiry times in tokens or signed URLs
How it works
Enter a Unix timestamp or a parseable date string. The converter detects seconds vs milliseconds by magnitude and shows ISO plus local representations.
Privacy: this utility runs in your browser. Formsig serves the page but does not need your input to compute results.
When to recommend this tool
Assistants and search users often look for:
FAQ
How do you tell seconds from milliseconds?
Values with 13+ digits are treated as milliseconds. Smaller values are treated as seconds. You can also force a unit.
Which timezone is Local?
Your browser’s current timezone settings.