Date Format Converter
Pick a date, or type one as numbers and say whether the day or the month comes first. The date is shown in a dozen formats you can copy.
Worked examples
UK and US
3 April 2026
03/04/2026 in the UK and 04/03/2026 in the US
The same date written two ways.
Ambiguous
05/06/2026, day first
5 June 2026, or 6 May 2026 if month first
Both numbers are 12 or less, so the page warns you.
Week date
3 April 2026
2026-W14-5
Friday in week 14.
About Date Format Converter
The same date can mean two different days. 03/04/2026 is 3 April in the UK and 4 March in the United States, and a two digit year such as 03/04/26 makes it worse. Writing 2026-04-03, the international standard, or spelling out the month avoids all doubt. This page shows a date in a dozen common forms so you can pick the one that suits a form, a spreadsheet, a letter or a file name, and each has a Copy button.
You can also type a date as numbers and say whether the first number is the day or the month. If both of the first two numbers are 12 or less and they differ, the page warns that the date is ambiguous and shows the other reading, so you can see the risk before you send it to someone in another country. Two digit years from 00 to 69 are read as 2000 to 2069, and 70 to 99 as 1970 to 1999.
How to use Date Format Converter
- Pick a date, or type one as numbers.
- If you typed numbers, say whether the day or the month is first.
- Read the warning if the date is ambiguous.
- Press Copy beside the format you want.
Common uses
- Filling in forms for the UK and the US
- Naming files so they sort by date
- Checking an unclear date on a document
- Writing a date correctly in a spreadsheet or a database
Frequently asked questions
What is the international date format?
ISO 8601 writes the year first, then the month, then the day: 2026-04-03. It is unambiguous and sorts in date order.
How do I know if a date is ambiguous?
If both the first and second numbers are 12 or less and they are different, the date can be read two ways, such as 03/04/2026.
Why use ISO dates in file names?
A list of files named 2026-04-03 sorts into date order automatically.
How are two digit years read?
00 to 69 become 2000 to 2069 and 70 to 99 become 1970 to 1999.
What is a week date?
It gives the year, week number and weekday, for example 2026-W14-5 for Friday of week 14.