🕐 Timestamp Converter

About the Unix Timestamp Converter

A Unix timestamp (also called Epoch time or POSIX time) is the number of seconds that have elapsed since January 1, 1970 00:00:00 UTC — the Unix epoch. It is a timezone-independent, language-agnostic way to represent a precise moment in time as a single integer, used universally in databases, APIs, log files, and programming languages.

Seconds vs milliseconds

Most Unix systems use second-precision timestamps (e.g., 1700000000). However, many environments use millisecond-precision timestamps — JavaScript's Date.now() and Java's System.currentTimeMillis() both return milliseconds. A millisecond timestamp is roughly 1,000× larger than its second-precision equivalent. This tool automatically detects which unit you are using and converts accordingly.

Common use cases

• Decoding created_at, updated_at, or exp fields returned by APIs
• Converting timestamps found in server log files to human-readable dates
• Calculating the elapsed time between two events
• Generating future expiry times for JWTs, cache headers, or session tokens
• Converting user-friendly date inputs into numeric timestamps for database storage

How to use this tool

• Timestamp → Date: Paste or type a Unix timestamp (seconds or milliseconds) into the left panel. The date is displayed instantly in UTC, your local timezone, and ISO 8601 format.
• Date → Timestamp: Type a date string such as 2024-01-15 09:00:00 or 2024-01-15T09:00:00Z into the right panel and click Convert.
• Click Now to populate the current Unix timestamp.