Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and dates back to epoch seconds, in your browser. Detects seconds vs milliseconds automatically.
Private by construction. The conversion happens in this page's JavaScript. Nothing you paste here leaves your machine, and the tool keeps working with the network unplugged.
Paste an epoch value or a date string and get every common representation at once: seconds, milliseconds, UTC, ISO 8601, and your local timezone. Ten-digit values are read as seconds and thirteen-digit values as milliseconds, so log entries from either convention convert without you counting digits. Typing now converts the current moment.
Questions this tool gets asked
How does it tell seconds from milliseconds?
Values above 99,999,999,999 are treated as milliseconds. In practice, 10-digit timestamps are seconds and 13-digit timestamps are milliseconds, and the output states which interpretation was used.
What date formats can I paste?
ISO 8601 strings like 2026-01-01T00:00:00Z are the reliable choice. Most browser-parseable formats also work, and the word now converts the current time.
Is the local time based on my machine?
Yes. The local rendering uses your operating system's timezone, computed entirely in your browser.