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About Unix Timestamps

A Unix timestamp (also known as Unix time, POSIX time, or Epoch time) is a system for describing a point in time. It is the number of seconds that have elapsed since the Unix epoch, which was at 00:00:00 Coordinated Universal Time (UTC) on Thursday, 1 January 1970. It is widely used in operating systems and file formats.

How to Use This Tool

This tool allows you to convert between Unix timestamps and human-readable dates.

• To convert a timestamp to a date: Enter a Unix timestamp (in seconds or milliseconds) into the input field. The corresponding date will be displayed in UTC, your local timezone, and ISO 8601 format.
• To convert a date to a timestamp: Enter a date string (e.g., "2026-07-15", "July 15, 2026", or "2026-07-15T10:00:00Z") into the input field. The corresponding Unix timestamp will be generated.
• Current Timestamp: Click the "Current" button to populate the input with the current Unix timestamp.

Seconds vs. Milliseconds

While the formal definition of a Unix timestamp is in seconds, many systems (like JavaScript's `Date.now()`) work with milliseconds. This tool automatically detects whether the input is in seconds or milliseconds based on its magnitude.

Why are Timestamps Useful for Developers?

Timestamps are language-agnostic and timezone-independent, making them a universal standard for representing time in software. They are useful for:

• Logging events and tracking when they occurred.
• Storing dates and times in databases in a compact, numerical format.
• Performing date and time arithmetic.
• Caching and cache invalidation.