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US (MM/DD/YYYY)
Convert a date between US, international, ISO and written-out formats instantly.
Pick any date and this tool instantly displays it in four common formats side by side: the US convention (MM/DD/YYYY), the international convention used across most of the rest of the world (DD/MM/YYYY), the unambiguous ISO 8601 standard (YYYY-MM-DD), and a fully written-out form like 'Tuesday, March 3, 2026'.
A date written as 03/04/2026 means March 4th in the US convention but April 3rd almost everywhere else, since the day and month positions are swapped between the two systems. This ambiguity causes genuine confusion and errors in international communication, shipping labels, legal documents and software that mixes date formats without labeling them clearly — which is exactly the problem this tool is built to make visible and avoid.
The ISO 8601 standard, YYYY-MM-DD, was specifically designed to eliminate this confusion: because the year always comes first and uses four digits, and the month and day both use two digits, there's no possible ambiguity about which number represents what, and dates in this format also sort correctly as plain text or in a spreadsheet. It's widely used in software, databases, and international business precisely for this reason.
Use the US format for US-based forms and documents, the international format for most of the rest of the world (Europe, most of Asia, and many other regions), the ISO format whenever you need to avoid ambiguity entirely — such as filenames, spreadsheets, or cross-border communication — and the written-out format for anything meant to be read by a person rather than parsed by a system, where spelling out the month name removes any doubt.
Any date where both the day and month numbers are 12 or below is genuinely ambiguous without knowing the convention — 05/06/2026 could mean May 6th or June 5th depending on who wrote it. Dates where the first number is above 12, like 25/03/2026, are safe from that particular confusion since no month numbered above 12 exists, but it's still good practice to default to an unambiguous format whenever the audience isn't guaranteed to share your local convention.
The ISO 8601 format (YYYY-MM-DD) or the fully written-out format are both unambiguous choices, since neither depends on the reader guessing which number is the day and which is the month.
Because the US convention places the month first (MM/DD) while most other countries place the day first (DD/MM), the same two numbers in the same order represent two different calendar dates depending on which convention is being used.
Yes, beyond avoiding ambiguity, ISO 8601 dates sort correctly in plain alphabetical/text order because the components go from largest (year) to smallest (day), which is very convenient for databases, filenames and spreadsheets.
This tool converts date formats only, not times. For time zone or timestamp conversions, use the Timezone Converter or the Julian & Unix Timestamp Converter instead.
Yes, any valid calendar date can be converted into all four formats regardless of how far in the past or future it falls.