Date Format Converter

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Convert any date string into all common formats at once — ISO, Unix, US, EU, relative, and more.

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About Date Format Converter

Enter a date in any common format and instantly see it expressed in every standard representation. The tool accepts ISO 8601 (with or without time), US date notation (MM/DD/YYYY), EU notation (DD.MM.YYYY), Unix timestamps in seconds, and millisecond timestamps. Output includes the ISO 8601 string, Unix timestamp, US and EU formatted dates, a long human-readable form, a relative description (e.g. "3 days ago"), the day of the week, and the ISO week number. Ideal for QA engineers comparing timestamps across logs and API responses.

How to use

  1. Paste a date string — in any supported format — into the input panel.
  2. All output formats appear instantly in the output panel.
  3. Copy the format you need for your test case or documentation.

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Frequently Asked Questions

FAQs about Date Format Converter

Which input formats are accepted?

The tool accepts ISO 8601 (with or without a time component), US format MM/DD/YYYY, EU format DD.MM.YYYY, Unix timestamps in seconds (up to 10 digits), and millisecond timestamps.

What is a Unix timestamp?

A Unix timestamp is the number of seconds elapsed since January 1, 1970 00:00:00 UTC. It is used widely in APIs, databases, and log files because it is timezone-independent and easy to compare.

What does the relative time show?

The relative time compares the input date to the current moment and expresses the difference in human-readable terms such as "3 days ago", "in 2 hours", or "just now".

How is the week number calculated?

The tool divides the day of the year by 7 and rounds up to give a week number starting from week 1 on January 1st. This is a simple approximation rather than strict ISO week numbering.

Does the tool handle timezones?

Input is parsed using the browser's JavaScript Date object. ISO strings with a "Z" suffix are treated as UTC. Strings without timezone information are interpreted in the local timezone of the browser.