Unix Timestamp Converter
Convert Unix epoch time to human-readable dates and back, with seconds/milliseconds support, ISO 8601, timezones, and a live current timestamp.
Convert a timestampNo signup. No server calls. Works offline once the page loads.
Timestamp → Human date
Human date → Timestamp
How It Works
Enter a value
Type a Unix timestamp on the left, or pick a date and time on the right — both update instantly.
Choose unit & timezone
Seconds or milliseconds are auto-detected from digit length, and you can pick any timezone for display.
Read & copy
View local time, UTC, ISO 8601, and relative time side by side, then copy whichever you need.
Privacy note: all conversion happens locally in your browser using JavaScript's built-in date engine. Nothing is sent to a server.
Common Uses
Debugging API responses
Quickly turn raw epoch values from logs or JSON payloads into readable dates.
Scheduling & cron jobs
Work out exact fire times for scheduled tasks across timezones.
Database timestamp checks
Verify that stored epoch values correspond to the dates you expect.
Comparing event times
See relative time ("3 days ago") alongside exact timestamps for log analysis.
Frequently Asked Questions
What is a Unix timestamp?
A Unix timestamp (or epoch time) is the number of seconds that have elapsed since 00:00:00 UTC on January 1, 1970, not counting leap seconds.
How do I know if my timestamp is in seconds or milliseconds?
A 10-digit number is typically seconds (covers dates up to the year 2286), while a 13-digit number is typically milliseconds. The tool auto-detects this based on digit length but you can override it manually.
Does this tool account for my timezone?
Yes. You can select any timezone to display the converted date in that timezone, in addition to UTC and your browser's local timezone.
What is ISO 8601 format?
ISO 8601 is an international standard for representing dates and times, such as 2026-08-06T12:00:00Z. This tool displays the ISO 8601 representation alongside every converted timestamp.
Can I convert a future or past date to a timestamp?
Yes. Enter any date and time in the human-date input and the tool immediately calculates the corresponding Unix timestamp in both seconds and milliseconds.
Is the current timestamp updated live?
Yes. The tool shows a live-updating current Unix timestamp that ticks every second, which you can click to copy or use as a starting point for conversion.
Embed This Tool
Add a compact version of this tool to your own site. Free, ad-free, and privacy-preserving — it links back to Sadevz.
<iframe src="https://sadevz.com/embed/timestamp-converter/" width="100%" height="440" loading="lazy" title="Timestamp Converter — Sadevz"> </iframe>
More Tools
Seconds vs milliseconds, and code examples in JS/Python/SQL — read the Unix Timestamp Cheat Sheet →