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Unix Timestamp Converter

Convert between Unix timestamps (seconds/milliseconds) and human-readable dates. Auto-detect format, show ISO 8601, relative time, and timezone info.

Current Unix Timestamp:
1772199877

Conversion Results

Enter a Unix timestamp or date string and click Convert

Free Online Unix Timestamp Converter

Convert Unix timestamps (epoch time) to human-readable dates and vice versa. This tool auto-detects whether the input is in seconds or milliseconds, and converts to ISO 8601, UTC, local time, relative time, and more. Essential for developers working with APIs, databases, and logging systems.

How to Convert Unix Timestamps

  1. Enter a Unix timestamp (seconds or milliseconds) or a human-readable date
  2. The tool auto-detects the input format, or use the format toggle
  3. Click Convert to see all date representations
  4. Click the copy button next to any format to copy the value

Frequently Asked Questions

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, 00:00:00 UTC. It is widely used in programming, databases, and APIs as a universal time representation.
What is the difference between seconds and milliseconds timestamps?
A seconds-based Unix timestamp is typically 10 digits (e.g., 1700000000), while a milliseconds-based timestamp is 13 digits (e.g., 1700000000000). JavaScript Date.now() returns milliseconds, while most Unix systems use seconds.
What is the Year 2038 problem?
The Year 2038 problem occurs because 32-bit systems store Unix timestamps as a signed 32-bit integer, which overflows on January 19, 2038. Modern 64-bit systems are not affected.
How does the auto-detect feature work?
If the input number has 13 or more digits, it is treated as milliseconds. Numbers with 10 or fewer digits are treated as seconds. Non-numeric input is parsed as a date string.
What timezone is used for conversion?
Unix timestamps are always in UTC. The tool shows both UTC and your local timezone based on your browser settings.

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How to Use

  1. Enter a Unix timestamp to convert to a human-readable date
  2. Or enter a date string to convert to a Unix timestamp
  3. The tool auto-detects seconds vs milliseconds
  4. View results in UTC, local time, and ISO format

Common Use Cases

  • Converting API timestamps to readable dates
  • Debugging date-related issues
  • Comparing timestamps across systems
  • Working with JWT token expiration times

Frequently Asked Questions

What is a Unix timestamp?
A Unix timestamp is the number of seconds elapsed since January 1, 1970 00:00:00 UTC (the Unix epoch). It's a universal way to represent time in computing.
What's the difference between seconds and milliseconds?
Unix timestamps in seconds are 10 digits (e.g., 1700000000), while milliseconds are 13 digits (e.g., 1700000000000). JavaScript uses milliseconds, most systems use seconds.
Does this tool handle timezones?
Yes. The tool shows both UTC and your local timezone when converting timestamps, so you can see the exact time in both.