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Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa. Supports both seconds and milliseconds. Results update automatically as you type.

A Unix timestamp (also known as epoch time or POSIX time) is the number of seconds that have elapsed since January 1, 1970 at 00:00:00 UTC. It is widely used in programming, databases, APIs, and log files. This tool lets you quickly decode a timestamp into a readable date or convert any date back into a timestamp for use in your code or systems.

Current Unix Timestamp
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UTC Date/Time --
Local Date/Time --
ISO 8601 --
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About This Tool

The Unix Timestamp Converter helps developers, system administrators, and data analysts work with epoch time. Common use cases include:

  • Debugging API responses that contain timestamps
  • Converting log file timestamps to readable dates
  • Generating timestamps for database queries
  • Comparing event times across different time zones
  • Understanding when a cached resource was created or expires

The tool auto-detects whether your input is in seconds or milliseconds based on its magnitude. Values greater than 1 trillion are treated as milliseconds (common in JavaScript and Java), while smaller values are treated as seconds (common in Unix/C and Python).

FAQ

What is a Unix timestamp?
A Unix timestamp (also called epoch time or POSIX time) is the number of seconds that have elapsed since January 1, 1970 at 00:00:00 Coordinated Universal Time (UTC), not counting leap seconds. It is a simple, time-zone-independent way to represent a moment in time and is used extensively in programming, operating systems, databases, and web APIs.
What is the Y2038 problem?
The Y2038 problem (also known as the Year 2038 bug) affects systems that store Unix timestamps as a 32-bit signed integer. The maximum value of a 32-bit signed integer is 2,147,483,647, which corresponds to January 19, 2038 at 03:14:07 UTC. After that moment, the counter overflows and wraps to a negative number, potentially causing software to interpret dates as being in December 1901. Most modern systems now use 64-bit integers, which pushes this limit billions of years into the future.
What is the difference between seconds and milliseconds?
A Unix timestamp in seconds counts the whole seconds since the epoch. A timestamp in milliseconds is simply that value multiplied by 1,000, providing finer precision. JavaScript's Date.now() and Java's System.currentTimeMillis() return milliseconds, while Unix shell commands like "date +%s" and Python's time.time() return seconds. This tool auto-detects the format: if the number is greater than 1 trillion, it is treated as milliseconds.
What is epoch time?
Epoch time is another name for Unix time. The "epoch" refers to the reference point: January 1, 1970 at 00:00:00 UTC. All Unix timestamps are measured relative to this epoch. The term is sometimes used more broadly to mean any fixed reference date used as the start of a time-counting system, but in computing it almost always refers to the Unix epoch of 1970-01-01.

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