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Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds.

Current Timestamp

Unix → Human Date

Human Date → Unix

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What is a Unix Timestamp Converter?

A Unix timestamp converter translates between Unix epoch time (seconds or milliseconds since January 1, 1970 UTC) and human-readable date formats. Unix timestamps are the universal time representation in programming — they're timezone-independent, easy to store as integers, simple to compare and sort, and used by databases, APIs, operating systems, and logging frameworks worldwide. This tool shows you the current timestamp in real-time and converts in both directions instantly.

How to Use This Tool

  1. Unix → Human: Paste a numeric timestamp (10 digits for seconds, 13 for milliseconds) and click "Convert →" to see the full date in ISO, local, and UTC formats.
  2. Human → Unix: Use the date/time picker to select any date and click "Convert →" to get both seconds and milliseconds timestamps.
  3. Live reference: The current Unix timestamp updates every second at the top of the tool for quick reference.

Common Use Cases for Developers

  • API debugging: Convert timestamp fields in API responses (JWT exp claims, created_at fields, event timestamps) to verify they represent the expected times.
  • Database queries: Convert specific dates to Unix timestamps for WHERE clauses in databases that store time as integers.
  • Log investigation: Translate epoch timestamps in application logs and monitoring tools to understand when events occurred.
  • Cron job scheduling: Calculate future timestamps for scheduled tasks, cache expiration, and token validity windows.
  • Time zone debugging: Verify that timestamps represent the correct moment across different time zones by comparing UTC output.

Tips & FAQ

  • Seconds vs milliseconds: If your timestamp is 10 digits (e.g., 1700000000), it's in seconds. If 13 digits (e.g., 1700000000000), it's milliseconds. JavaScript's Date.now() returns milliseconds; most Unix tools and databases use seconds.
  • The Year 2038 problem: Systems storing Unix timestamps as 32-bit signed integers will overflow on January 19, 2038. Modern systems use 64-bit integers, which won't overflow for billions of years.
  • Always store UTC: Store timestamps in UTC and convert to local time only for display. This prevents bugs when users change time zones or during daylight saving transitions.