What Is a Unix Timestamp?
The Unix Timestamp Converter translates between Unix timestamps and human-readable dates across multiple time zones. A Unix timestamp counts the seconds (or milliseconds) since the epoch, 1 January 1970 UTC, and is the universal way software stores and exchanges points in time — in databases, log files, APIs and JWT expiry claims. This tool auto-detects whether your value is in seconds or milliseconds and shows the corresponding date in UTC, São Paulo time and your browser’s local zone, along with ISO 8601 and RFC 2822 strings. A live mode ticks the current timestamp second by second, and the Now button captures the present instant for quick reference.
A Unix timestamp (also called Epoch time) is the number of seconds that have elapsed since 00:00:00 UTC on 1 January 1970 — the Unix epoch. It is the most common way computers store and exchange dates internally because it is a single integer with no timezone ambiguity. Converting between a timestamp and a human-readable date is one of the most frequent tasks in debugging, log analysis and API work.
How to Use the Timestamp Converter
- Paste a Unix timestamp into the input — seconds and milliseconds are detected automatically.
- Read the converted date in UTC, São Paulo and your local time zone, plus ISO 8601 and RFC 2822.
- Press Now to grab the current timestamp, or enable Live to watch it update every second.
Use Cases
- Reading a Unix timestamp from a log file, database record or API response and finding out what date and time it represents.
- Converting a specific date and time into a timestamp for use in a database query or API call.
- Debugging 'time in the past' or 'token expired' errors that show an epoch number.
- Comparing two timestamps to calculate elapsed time between events.
How Timestamp Conversion Works
JavaScript's Date object handles conversion natively. A timestamp (in milliseconds for JS, but divided by 1000 for Unix seconds) is passed to new Date(ms) and the result can be formatted to any timezone with toLocaleString(). Going the other direction, new Date('2024-01-01').getTime() / 1000 converts a human-readable date back to a Unix timestamp.
The tool shows the timestamp in your local timezone and in UTC, so the difference is always visible. It also handles millisecond timestamps (13 digits) automatically, since many modern APIs use millisecond precision.
Benefits and Use Cases
- Indispensable for developers debugging logs, database records and API responses that store time as Unix epochs.
- Shows several time zones at once, eliminating manual offset math when comparing events across regions.
- Works fully offline in your browser using the built-in Intl API — no data is ever sent anywhere.
Privacy
All conversion happens in your browser. The timestamps and dates you enter are never sent to our servers. The tool uses your device's own clock and timezone data.