DevsToolkit

Timestamp Converter

Converters

Convert between Unix timestamps and human-readable dates. Supports seconds, milliseconds, ISO 8601, and relative time formats.

All processing happens locally in your browser — your data never leaves your machine.
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Examples

Unix timestamp (seconds) to date

Input
1700000000
Output
2023-11-14T22:13:20.000Z

Unix timestamp (milliseconds) to date

Input
1700000000000
Output
2023-11-14T22:13:20.000Z

ISO date string to timestamp

Input
2024-07-04T12:00:00Z
Output
1720094400

Frequently Asked Questions

What is a Unix timestamp (epoch time)?
A Unix timestamp, also known as 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 widely used standard for representing points in time in computing, databases, APIs, and log files. Millisecond timestamps multiply this value by 1,000.
How do I tell if a timestamp is in seconds or milliseconds?
Unix timestamps in seconds are typically 10 digits long (e.g., 1700000000), while millisecond timestamps are 13 digits (e.g., 1700000000000). This tool automatically detects which format you've entered and converts accordingly.
What is ISO 8601 date format?
ISO 8601 is an international standard for representing dates and times. The most common format is 'YYYY-MM-DDTHH:mm:ss.sssZ', where T separates the date and time, and Z indicates UTC. It is the preferred format for data interchange because it is unambiguous and sorts correctly as a string.
Why do developers use Unix timestamps instead of regular dates?
Unix timestamps are timezone-independent, making them ideal for storing and comparing times across distributed systems. They are simple integers, which are easy to store, sort, and compute with. They avoid ambiguity from date format differences (e.g., MM/DD vs DD/MM) and are natively supported by virtually every programming language and database.

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