Timestamp Converter
Convert timestamps to human-readable dates and dates back to timestamps. Auto-detects seconds vs milliseconds, shows local, UTC and ISO 8601 formats.
Current timestamp (live)
What is the Timestamp Converter?
The ByteTools Timestamp Converter turns machine timestamps into readable dates and readable dates back into timestamps.
- Bidirectional: timestamp → date and date → timestamp
- Auto-detects seconds vs milliseconds input
- Shows local time, UTC and ISO 8601 simultaneously
- Live ticking current timestamp with copy buttons
- "Now" button fills the date picker instantly
- Runs entirely in your browser — safe for production data
How to use the Timestamp Converter
- 1
Copy the live current timestamp, or paste a timestamp into the converter — seconds vs milliseconds is detected automatically.
- 2
Read the result in local time, UTC and ISO 8601.
- 3
To go the other way, pick a date and time (or press Now) and copy the resulting timestamp in seconds or milliseconds.
About the Timestamp Converter
The ByteTools Timestamp Converter turns machine timestamps into readable dates and readable dates back into timestamps. Paste any Unix-style timestamp and it automatically detects whether it is in seconds or milliseconds, then shows the moment in your local time, UTC and ISO 8601 formats.
Going the other way, pick any date and time and get the matching timestamp in both seconds and milliseconds with one-click copy. A live, ticking display of the current timestamp sits at the top, and a "Now" button fills the picker instantly — perfect for developers debugging logs, APIs, databases and JWT expiry claims.
The whole tool runs client-side in your browser. No timestamps, logs or dates are uploaded anywhere, so it is safe to use with production data.
Frequently asked questions
How do I convert a timestamp to a date?
Paste the timestamp into the input. The tool multiplies seconds by 1000 if needed, creates a JavaScript Date from the milliseconds, and displays it in your local time zone, in UTC and as an ISO 8601 string.
How can I tell if a timestamp is in seconds or milliseconds?
Current Unix timestamps in seconds are 10 digits (about 1.7 billion), while millisecond timestamps are 13 digits. This converter checks the magnitude automatically, so a 13-digit value is treated as milliseconds and a 10-digit one as seconds.
What is ISO 8601 format?
ISO 8601 is the international standard for writing dates and times, e.g. 2026-07-04T12:30:00.000Z. The trailing Z means UTC. It sorts correctly as text and is unambiguous across regions, which is why APIs and databases prefer it.
Why does the converted date look different from what my server logged?
Most likely a time zone difference: this tool shows both your local time and UTC for the same instant. Servers usually log in UTC, so compare against the UTC line, not the local one.
Are timestamps affected by time zones?
No. A Unix timestamp identifies one absolute instant worldwide — only its human-readable representation changes with the zone. That is exactly why systems store timestamps and convert to local time only for display.
Guides for Timestamp Converter
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