Time Converter
Developer tool to convert between Unix timestamps and human-readable dates, supporting various formats.
About Time Converter
The Time Converter is a free, browser-based tool that converts between Unix timestamps and human-readable dates and reformats a date into many output formats. It runs entirely in your browser, so the dates you enter never leave your device.
The tool combines three converters on one page: a Unix timestamp converter that switches between seconds and milliseconds and updates the timestamp and date together, a date format converter that shows the same moment as ISO 8601, UTC, a local string, YYYY-MM-DD, HH:mm:ss, and Unix time in seconds and milliseconds, and a Linux date formatter that builds strftime-style strings such as %Y-%m-%d %H:%M:%S.
It is aimed at developers and anyone working with logs, APIs, filenames, or shell scripts. You can paste a timestamp from a log to read it as a date, or pick a date to get its epoch value, copy any result with one click, set a live clock that ticks every second, and define custom dayjs format tokens that are saved in your browser for next time. The Linux section also generates editable shell command examples for tools like tar and zip.
Dates display in your computer's local time zone, with UTC shown as a separate row. Custom formats are stored only in your browser's local storage, and the share button copies a link containing your saved formats so you can reopen the same setup elsewhere; nothing is uploaded to a server.
Frequently asked questions
- Does it use timestamps in seconds or milliseconds?
- Both. The Unix timestamp converter has a seconds/milliseconds toggle, and the date format table also lists the result in both units so you can copy the value you need.
- Which time zone do the results use?
- Dates are shown in your computer's local time zone. The format table includes a separate UTC row so you can compare local time and UTC at a glance.
- Are my custom formats saved, and is my data safe?
- Custom formats are kept in your browser's local storage, so they stay on your device. All conversion happens in the browser with no server upload, and the share button only builds a link that carries your formats.