This free online timestamp converter lets you convert between Unix timestamps and human-readable dates instantly in your browser. Whether you're debugging server logs, working with database records, or calculating time differences in API payloads, this tool handles seconds and milliseconds with full timezone support and zero server calls.
Step-by-Step
Enter a Unix timestamp — Paste a Unix timestamp (seconds or milliseconds since January 1, 1970) to convert it to a human-readable date and time.
Or pick a date — Select a date and time using the date picker to generate the corresponding Unix timestamp.
View results — See the output in multiple formats including UTC, your local timezone, ISO 8601, and relative time ("3 hours ago").
Features
Unix to Date — Convert epoch timestamps in seconds or milliseconds to formatted date strings.
Date to Unix — Convert any date and time to a Unix timestamp in both seconds and milliseconds.
Auto-detect format — Automatically determines whether the input is in seconds (10 digits) or milliseconds (13 digits).
Multiple output formats — ISO 8601, RFC 2822, locale-specific, and relative time display.
UTC and local time — View conversions in both UTC and your browser's local timezone.
Current timestamp — One-click button to grab the current Unix timestamp.
Client-side processing — All conversions use native JavaScript Date objects. No server required.
Common Use Cases
Server Log Analysis — Server logs and monitoring tools (Datadog, CloudWatch, Grafana) often use Unix timestamps. Convert them to readable dates to correlate events with incident timelines.
Database Debugging — PostgreSQL, MySQL, and MongoDB frequently store timestamps as Unix epochs. Convert them to verify that records have the correct creation and modification times.
JWT Expiration Checks — JWT tokens store exp and iat claims as Unix timestamps. Convert these to readable dates to debug authentication and token refresh issues.
API Development — REST and GraphQL APIs often return timestamps as epoch integers. Convert them to verify your API returns the correct date values.
Cron Job Verification — After setting up scheduled tasks, convert Unix timestamps from logs to confirm that jobs ran at the expected times.
Tips for Power Users
- Unix timestamps in seconds have 10 digits (e.g., 1700000000). Millisecond timestamps have 13 digits (e.g., 1700000000000). The tool auto-detects which format you've entered.
- JavaScript's Date.now() returns milliseconds. Divide by 1000 for seconds.
- The "current timestamp" button is useful for generating timestamps to use in API testing tools like Postman or curl.
- Pair this tool with the Cron Parser to verify both when a job is scheduled and when it actually ran.
- Remember that Unix timestamps are always UTC-based — timezone offsets are applied at display time.
Why Use This Tool?
This timestamp converter runs entirely in your browser using JavaScript's native Date API. No data is sent to any server, making it safe for converting timestamps from sensitive logs, database records, and authentication tokens. It's instant, accurate, and handles both seconds and milliseconds formats automatically.