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Unix Timestamp Converter
Convert between Unix seconds, milliseconds, and an ISO date.
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How to use unix timestamp converter
- Enter a timestamp or an ISO date-time with Z or a numeric UTC offset.
- Choose the matching Input format: Unix seconds, Unix milliseconds, or ISO date.
- Select Process input and compare UTC ISO, seconds, milliseconds, and local fields.
Work through an example
Convert a known timestamp to UTC, supply an explicit ISO offset, and avoid treating a local display as the source time zone.
Tell Unix seconds from milliseconds in a log entry →Formats, privacy, and practical limits
This tool processes the values you enter in your browser. No account or upload to ERITHRA is required.
Files and generated results exist only for this tab session. Download any result you want to keep before leaving the page. Browsers may use temporary memory or disk cache while processing.
Frequently asked questions
Why does a timestamp produce a date near 1970?
Check the selected unit. Treating Unix seconds as milliseconds describes a different instant much nearer the epoch.
Why does the local field differ between devices?
It uses the browser device's configured local time zone. The UTC ISO field identifies the same instant across those displays.