I believe it’s because of how it’s said colloquially in conversation. I.e. When is your birthday? “It’s August 3rd, 2018” then becomes 8/3/2018. So the more proper English Empire/Commonwealth answer being “The 3rd of August, 2018.” Which tracks to 3/8/2018. Would be a good follow on question for folks who speak other languages to find out if the language dictates/matches the formatting or not... Answer from CixelBroi on reddit.com
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ISO
iso.mit.edu › americanisms › date-format-in-the-united-states
Date Format in the United States | ISO
The United States is one of the few countries that use “mm-dd-yyyy” as their date format–which is very very unique! The day is written first and the year last in most countries (dd-mm-yyyy) and some nations, such as Iran, Korea, and China, write the year first and the day last (yyyy-mm-dd).
Discussions

american english - Date format in UK vs US - English Language & Usage Stack Exchange
Why is the most common date format in the US like mm/dd/yyyy, whereas in Europe (including the UK) it's more common to have dd/mm/yyyy? Looking around, I found that the US form is actually the more More on english.stackexchange.com
🌐 english.stackexchange.com
May 24, 2012
CMV: YYYY-MM-DD is the superior date format
There is something to be said for presenting the most useful information first. We typically don't need to say the year. For example, If i told you I was going to do something January 10th, you would know what I mean. We also don't ways need to say the month. If i told you i'd do something on the 21st, you'd assume i'm meant the 21st of this month. So we we start with the most relevant information first, there a decent debate to be had over whether we should say the day or the month first. But definitely the year is not very relevant. Very often we only need MM/DD or DD/MM. YYYY/xx/xx is a waste of some space. Especially when speaking. In terms of sorting, most of the time dates are stores as dates and rendered in any format selected. So you can sort properly regardless of format. YYYY-MM-DD has its place. Its good when communicating between different applications which don't share a common data structure. Like between Excel and a database. Its also good when embedded into text fields which you want to sort. Although really you shouldn't be doing that. More on reddit.com
🌐 r/changemyview
101
26
December 13, 2018
Date format
The only logical way is the ISO-8601 standard, going from largest to smallest: yyyy-mm-dd hh:mm:ss. That's the way we write all numbers, every digit has more weight than the digit to the right and less weight than the digit to the left. The ISO standard is particularly good for software, because all you need to sort a list of dates in chronological order is to sort the strings by alphabetical order. More on reddit.com
🌐 r/Metric
36
25
July 24, 2022
Is there anything actually wrong or illogical about the American date format (MM/DD/Y)?
No. It is merely non-intuitive and inconvenient to sort algorithmically. More on reddit.com
🌐 r/NoStupidQuestions
22
2
December 22, 2022
I believe it’s because of how it’s said colloquially in conversation. I.e. When is your birthday? “It’s August 3rd, 2018” then becomes 8/3/2018. So the more proper English Empire/Commonwealth answer being “The 3rd of August, 2018.” Which tracks to 3/8/2018. Would be a good follow on question for folks who speak other languages to find out if the language dictates/matches the formatting or not... Answer from CixelBroi on reddit.com
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Wikipedia
en.wikipedia.org › wiki › Date_and_time_notation_in_the_United_States
Date and time notation in the United States - Wikipedia
2 days ago - In traditional American usage, dates are written in the month–day–year order (e.g. March 11, 2026) with a comma before and after the year if it is not at the end of a sentence, and time is written in 12-hour notation (e.g. 9:17 pm). International date and time formats typically follow the ...
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Maps International
mapsinternational.co.uk › home › why does the usa use its current calendar date format?
Why does the USA use its current calendar date format? - Maps International Blog
August 26, 2020 - The answer is 0. The United States is surprisingly alone in the world to exclusively use MM/DD/YYYY as a format. A vast majority of the world including the UK uses Date first. There are some exceptions, where countries use both of course but ...
Find elsewhere
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Wikipedia
en.wikipedia.org › wiki › List_of_date_formats_by_country
List of date formats by country - Wikipedia
3 days ago - For instance, depending on the order style, the abbreviated date "01/11/06" can be interpreted as "1 November 2006" for DMY, "January 11, 2006" for MDY, or "2001 November 6" for YMD. The ISO 8601 format YYYY-MM-DD (2026-03-10) is intended to harmonise these formats and ensure accuracy in all ...
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Laughing Squid
laughingsquid.com › home › why the united states displays the date in a different format than most of the world
Why the United States Displays the Date In a Different Format Than Most of the World
July 31, 2017 - In a timely episode of Today I Found Out, host Simon Whistler explains the mysterious history of the specifically American format of plotting the date leading with month then the date ((MM/DD/YYYY) rather than the more established format of ...
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Oracle
docs.oracle.com › cd › E41183_01 › DR › Date_Format_Types.html
Date Format Types
You are here: Function Reference > Date Functions > Date Formats > Date Format Types · Month abbreviations consist of the first three characters of the month’s name. Months with four-character names, such as June, are not abbreviated. Here are some examples, using December 18, 2010: © Copyright 2014, Oracle and/or its affiliates.
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Adobe
adobe.com › acrobat › resources › how-to-write-the-date.html
How to write dates correctly | Adobe Acrobat
If you plan to include the day of the week, then use the weekday, followed by the month, day, and then the year. Here are some examples of how to write the date in American English: ... Mar. 15, 2025 ... American English requires writers to separate the day and the year with a comma. You should also place a comma after the weekday. If you’re learning how to write the date in MLA format, which is a specific citation style, then write the date in the day-month-year order.
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Quora
quora.com › Why-do-we-write-dates-MM-DD-YYYY-in-America-but-Brits-and-others-write-DD-MM-YYYY
Why do we write dates MM/DD/YYYY in America but Brits and others write DD/MM/YYYY? - Quora
Answer (1 of 181): Answer the following before you read on. > Which do you say: “October the 20th”, or “The 20th of October”? Now the question above was me tricking you. While I’m kind of interested in which option you picked, but I actually wanted to do was see whether you responded “Neither!...
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W3C
w3.org › International › questions › qa-date-format › 1000
Date formats
Visitors to a web site from varying locales may be confused by date formats. The format MM/DD/YY is unique to the United States (but sometimes used in Canada, too, which can obviously create some confusion there). Most of Europe uses DD/MM/YY. Japan uses YY/MM/DD.
Top answer
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18

Although there are people who will sometimes say:

  1. Today is Thursday, the 24th of May, 2012.

There are also others who instead say the same thing this way:

  1. Today is Thursday, May 24th, 2012.

Certainly in the United States, the second way of mentioning a date is more common than the first. The long form sounds more formal to us, as in “on the Fourth of July” being more formal and long-winded than simply saying “on July 4th”.

It was pronouncing the month before the day out loud that gave to retaining that same original order when converted to digits: merely convert the month name to a natural number, and there you have your answer. What’s today’s date? It’s May 24th. Instead of writing May-24, we simply change the “May” to “5” and write 5-24 or ⁵⁄₂₄.

That way it follows the natural language order and so requires no mental gymnastics to switch things around when speaking the date aloud. Similarly “September 11th” gets written ⁹⁄₁₁, etc.

The full spoken form with the year, “May 24th, 2012”, then becomes the written shorthand “5/24/2012”, or often just “5/24/12”. “Christmas of 2001” can be, and somewhat annoying often is, written “12/25/1”, while “January 25th, 2012” becomes “1/25/12”.

This isn’t usually any sort of problem because of universal consensus on how to interpret such things in the United States. If you write day/month/year in America, you will not be understood. Although I myself prefer the ISO notation, normal people do not use it in their daily affairs.

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It's very possible that the US inherited this from an outdated English format - much like the length unit, after Henry III's foot and which the English have left behind in favour of the more logical metric system.

One argument I've heard in favour of the American system of dating is that the numbers of months in a year is smaller than the number of days in a month which itself is smaller than the number of possible years. So you would have 12/31/2013, in ascending order. I don't really buy this argument, but OP might be interested in it anyway so here it is.

Meanwhile, in Northern Europe they've moved on to an opposite, descending date standard: year/month/day.

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Quora
quora.com › Why-does-the-U-S-use-the-most-confusing-date-format-in-the-world
Why does the U.S. use the most confusing date format in the world? - Quora
The United States and their largest trading partner Canada use “mm-dd-yyyy”, however, Canada also employs the “dd-mm-YYYY” format internally. When English settlers came to the New World, they brought this particular sequence from England. American colonists maintained this format and it’s been that way ever since. Although GB may have changed the way they write the date, the U.S.
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Adams on Contract Drafting
adamsdrafting.com › home › blog › the u.s. date format: going rogue
The U.S. Date Format: Going Rogue - Adams on Contract Drafting
November 1, 2015 - For one thing, it can create confusion: when it comes to dates, 10/6/15 could mean October 6, 2015 (US) or 10 June 2015 (elsewhere). If you have the urge to strike a blow for rationality, you could start using in contracts and elsewhere the format dd-mm-yyyy, which is used by the countries ...
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ADEX
adextesting.org › home › adex dental
Dental (ADEX) | American Board of Dental Examiners
September 12, 2022 - The ADEX exam features five skill-specific components, including a high-fidelity computerized OSCE. View exam calendars here.
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Microsoft Support
support.microsoft.com › en-us › office › format-a-date-and-time-field-47fbbdc1-52fa-416a-b8d5-ba24d881b698
Format a date and time field - Microsoft Support
Right-click the date field, and then click Properties. In the Property Sheet, select the format you want from the Format property list. ... Use the FormatDateTime function to format a date value into one of several predefined formats.
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YouTube
youtube.com › lost in the pond
Why Do Americans Write the Date Like This? | #shorts - YouTube
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Published   November 12, 2023
Views   3M
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Grammarly
grammarly.com › blog › writing-tips › how-to-write-dates
How to Write Dates Correctly | Grammarly
July 1, 2023 - Many people get confused about how to write dates with commas, so here is a rule of thumb: In the month-day-year format (used in the United States), place commas after the day and year.
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Quora
quora.com › Why-is-the-USA-the-only-country-to-use-MM-DD-YYYY-format-and-the-world-uses-DD-MM-YYYY
Why is the USA the only country to use MM/DD/YYYY format and the world uses DD/MM/YYYY? - Quora
Answer (1 of 113): To paraphrase Halon’s Razor, never attribute to self-righteous exceptionalism that which is adequately explained by laziness. The date is formulated this way in the US simply because that’s the way it is spoken. People generally say month first, then day.