Enter a Unix timestamp to convert
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Convert Unix timestamps (epoch time) to human-readable dates and back instantly. Supports both seconds and milliseconds with automatic detection, timezone-aware conversion, and a live clock. All processing happens in your browser.
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. It is widely used in programming, databases, APIs, and server logs as a compact, timezone-independent way to represent a point in time. Timestamps in milliseconds (13 digits) are common in JavaScript, Java, and many web APIs.
Working with timestamps in your code? Here's how to get and convert them in popular languages:
Paste your Unix timestamp (in seconds or milliseconds) into the input field. The tool automatically detects the format and shows the converted date with day of week, relative time, and multiple output formats including ISO 8601 and RFC 2822.
Unix timestamps in seconds are 10 digits long (e.g., 1700000000), while millisecond timestamps are 13 digits (e.g., 1700000000000). Languages like JavaScript use milliseconds (Date.now()), while most Unix systems and languages like Python use seconds. This tool auto-detects which format you enter.
Unix timestamps are always in UTC. When converting to a human-readable date, the timezone determines how the date and time are displayed. For example, the same timestamp shows different clock times in New York (EST/EDT) and Tokyo (JST). Use the timezone selector to see the date in any timezone.
The Year 2038 problem affects systems storing timestamps as 32-bit signed integers. On January 19, 2038, at 03:14:07 UTC, these systems will overflow. Modern systems use 64-bit integers, which won't overflow for billions of years. This tool handles timestamps well beyond 2038.
The live clock at the top shows the current Unix timestamp updating in real-time. You can also click "Use current timestamp" to paste it into the converter. In code: JavaScript uses Date.now(), Python uses time.time(), and most other languages have similar functions.
Yes. All conversions happen entirely in your browser using JavaScript's built-in Date and Intl APIs. No timestamps or dates are sent to any server. Your last input and timezone preference are saved in your browser's localStorage for convenience.
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