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Date format converter

Pick a date to see it in every common format, ready to copy.

How Date format converter works

Date Format Converter takes a single date and simultaneously displays it in six standard representations: ISO 8601 (YYYY-MM-DD), US style (MM/DD/YYYY), European style (DD/MM/YYYY), dotted notation (DD.MM.YYYY), compact integer (YYYYMMDD), and Unix timestamp in seconds. All conversion happens inside your browser using the JavaScript Date object; nothing you type is sent to any server, and the tool works without a network connection once the page has loaded.

The ISO 8601 output is particularly useful for database records and API calls where locale-ambiguous formats cause parsing errors. The Unix timestamp column lets you copy a value ready for use in spreadsheets, shell scripts or programming environments that count seconds since the Unix epoch (1 January 1970 UTC). Leap years and the varying lengths of months are handled correctly by the browser's Date engine. Alongside the numeric formats you also get the long written form for your language, the kind you would use in a letter rather than in a filename.

Written by Bastien Sulyan

How to use Date format converter, step by step

  1. Type or paste a date into the input field, or use the date picker.
  2. The six format outputs update instantly as you type.
  3. Click the copy icon beside any format to copy that specific string to the clipboard.
  4. Adjust the date to check neighbouring dates without clearing the field.

Common use cases

  • A developer needs to convert a date received from a US partner (MM/DD/YYYY) into ISO 8601 for storage in a PostgreSQL date column.
  • An accountant pastes a European date from a PDF invoice and quickly reads the equivalent Unix timestamp for importing into accounting software.
  • A content editor checks which compact format (YYYYMMDD) to use for naming archived files consistently across regions.
  • A student verifies the correct ISO representation of a date for a technical report that requires machine-readable references.

Frequently asked questions

Does this tool adjust for my local timezone when calculating the Unix timestamp?

The Unix timestamp output represents midnight on the entered date in UTC. If you enter a local date, the displayed timestamp corresponds to 00:00:00 UTC on that date, not midnight in your local timezone. For timezone-aware timestamp conversion, adjust the date in the input accordingly.

What happens if I enter an ambiguous date like 05/06/2024?

The tool reads the date from a structured date picker or from an unambiguous typed format. If you type a string, use a format the browser Date parser accepts without ambiguity, such as YYYY-MM-DD. The date picker avoids the problem entirely by separating day, month and year into distinct fields.

Does the converter support dates before 1970 or far in the future?

Yes. The JavaScript Date object supports a range of roughly 275 760 years either side of the epoch. Dates before 1970 produce negative Unix timestamps, which is a valid and standard representation used widely in computing.

Is any record kept of the dates I convert?

No. The conversion runs entirely in the browser tab using the JavaScript Date object. Nothing you type is transmitted, logged or stored anywhere outside your own device.

Why does ISO 8601 use hyphens while the compact format uses no separators?

ISO 8601 specifies hyphens as the standard separator for the extended format (YYYY-MM-DD), which is the most widely interoperable form for data exchange. The compact form (YYYYMMDD) is also defined by ISO 8601 as the basic format, used in contexts where separators would break parsing, such as filenames or database keys.

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