Unix Timestamp Converter

What is Unix Timestamp Converter?

Unix Timestamp Converter is a free online tool for converting between unix timestamps (seconds or milliseconds since the 1970-01-01 UTC epoch) and human-readable dates. Epoch values are everywhere — API payloads, JWT exp claims, database rows, log lines — but they mean nothing at a glance. Paste one above and get the ISO 8601 date, the UTC string, your local time, and a relative reading like "2 hours ago" instantly. Going the other way, type or pick a date and get the exact epoch seconds and milliseconds back.

Features

• Unix → date — Paste epoch seconds or milliseconds; auto-detection picks the right unit (absolute values of 1e12 and above are treated as milliseconds), or force one explicitly
• Date → unix — Enter an ISO 8601 date or use the date-time picker; strings without a timezone offset are interpreted as UTC, never as browser-local time
• Live "now" strip — The current unix time in seconds and milliseconds, ticking every second, with one-click copy
• Four views of every date — ISO 8601, UTC, your local timezone, and a live-updating relative reading
• Deterministic and exact — Fractional seconds are supported, and every conversion is pure math with no guesswork

How to use

The top strip always shows the current time as epoch seconds, milliseconds, and ISO 8601 — click any value to copy it. To decode a timestamp, paste it into the "Unix to date" card and pick a unit (auto, seconds, or milliseconds). To encode a date, type an ISO 8601 string or use the picker in the "Date to unix" card; both inputs stay in sync. Every output row has its own copy button.

Privacy

Conversion runs locally in the browser UI. Timestamps and dates you convert on the page are not uploaded or logged.