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Date Format Converter

Convert a date into ISO, US, EU, long, and word formats.

Privacy: your files never leave your device. All processing happens locally in your browser.

How to use

  1. 1.Pick a date in the date field; it defaults to today.
  2. 2.Read every format instantly below: ISO, US, European, long, weekday, ordinal, words, and Unix.
  3. 3.Click Copy on any line to put that exact format on your clipboard.

About Date Format Converter

This date format converter turns a single date into every common format the instant you pick it, so you never have to reformat a date by hand again. Choose a date and the tool shows the ISO 8601 form (2026-07-06), the US numeric form (07/06/2026), the European numeric form (06/07/2026), long month-name forms, a weekday form, the ordinal day, two date-to-words spellings, and the Unix timestamp, each on its own line with a one-click copy button.

The most important thing this converter gets right is the order of the numbers, because US and European dates look identical but mean different things. The US format is month/day/year, so 07/06/2026 is July 6. The European format used across most of the world is day/month/year, so the same 06/07/2026 is also July 6, but the digits are swapped. ISO 8601, the international standard, avoids the ambiguity entirely by going big-endian as year-month-day (2026-07-06), which is why it sorts correctly as plain text and is the safest choice for filenames, databases, and spreadsheets. The tool labels each line clearly so you always know whether you are looking at month-first or day-first.

For the long forms you get US style (July 6, 2026), European style (6 July 2026), and a full weekday style (Monday, July 6, 2026). The ordinal day (6th) follows the standard English rule: the suffix is normally -th, but a number ending in 1 takes -st, 2 takes -nd, and 3 takes -rd, with the important exception that 11th, 12th, and 13th always take -th because they are pronounced eleventh, twelfth, and thirteenth. So you get 21st, 22nd, and 23rd, but 11th, 12th, and 13th.

Date to words is offered in two accepted conventions. The British or formal style writes the day as an ordinal with of, as in the sixth of July, twenty twenty-six. The American style puts the month first, as in July sixth, two thousand twenty-six. Both spell the number fully, which is useful for cheques, contracts, invitations, and any text that must not be misread.

The Unix timestamp is calculated from the UTC midnight of the date you pick, so it is stable no matter what time zone you are in and will not drift to the previous day. That makes it safe to paste into code, logs, or APIs that expect seconds since the epoch.

Common uses include converting a US date to the European order or the reverse before sending it abroad, writing a date out in full words for a legal document, getting the correct ordinal like 3rd or 22nd for a heading, producing an ISO date for a filename or a database column, and grabbing a Unix timestamp for a script. Everything runs in your browser, so the date you enter never leaves your device and nothing is uploaded, with no signup and no limit on conversions. To add or subtract days from a date use a date add subtract calculator, to find just the weekday use a day of the week calculator, and to work out an age from a birth date use an age calculator.

Frequently asked questions

What is the difference between US and European date formats?
The US format is month/day/year, so 07/06/2026 means July 6. The European format used by most of the world is day/month/year, so 06/07/2026 also means July 6 but with the day first. ISO 8601 (2026-07-06) is year-month-day and avoids the ambiguity.
How do I convert a date to words?
The tool spells the date in two accepted styles: the British form the sixth of July, twenty twenty-six, and the American form July sixth, two thousand twenty-six. Both write the day and year in full, which is handy for cheques, contracts, and invitations.
How is the ordinal day suffix decided?
The suffix is normally -th. A number ending in 1 takes -st, ending in 2 takes -nd, and ending in 3 takes -rd, except 11th, 12th, and 13th, which always take -th. So the month gives 1st, 2nd, 3rd, 11th, 12th, 13th, 21st, 22nd, 23rd, and 31st.
Which date format should I use for filenames or spreadsheets?
Use ISO 8601 (year-month-day, like 2026-07-06). Because it is big-endian, it sorts correctly as plain text, is unambiguous worldwide, and is the safest choice for filenames, database columns, and spreadsheet cells.
How is the Unix timestamp calculated?
It is the number of seconds from January 1, 1970 UTC to the UTC midnight of the date you pick. Using UTC midnight keeps the value stable across time zones so it never drifts to the previous or next day.

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