How to Write Dates in English: British vs. American Style

A hotel in Chicago confirms your booking for 05/12/2026. You read it as December 5th; they've entered it in the system as May 12th. A seven-month gap fits neatly into one line of six digits, and both sides are convinced they're right.

Dates are where English splits most clearly into two camps, more clearly than colour versus color. The British write the day first, Americans write the month first, and any date where both numbers are smaller than thirteen is ambiguous to half the world. On top of that, the way it's written on paper and the way it's spoken aloud don't match, so knowing how to write it doesn't mean you can say it.

This page covers it all: the two orders and how to choose between them, how to write dates in formal emails, ordinal numbers that go with dates, how to say a date out loud, how to say years, and then the hardest part — hearing someone else say a date without missing anything. If you're still not sure of the seven day names or the twelve month names, keep the two articles days of the week in English and months in English open in another tab.

• The two date orders and how to choose
• Writing dates in formal emails
• Ordinal numbers that go with dates
• Saying a date out loud
• How to say years
• What on, in, at go before
• Hearing dates in real speech
• Seven common mistakes
• Frequently asked questions
• What to do next

The two date orders and how to choose

There are only two orders to remember, plus a third form for machines. Master these three forms and you can handle everything from text messages to contracts.

The danger zone is the numeric form. 12/05/2026 is May 12th to the British and December 5th to Americans, and there's no way to look at that string of digits and tell which camp the writer belongs to. The safe rule is simple: any date where both leading numbers are smaller than thirteen is ambiguous, so in anything sent abroad, always spell the month out in words. Write 12 May 2026 and no one can misread it, whether they're in London or Houston.

The ISO form 2026-05-12 isn't used in running text, but it's the form you should use for file names, folder names, and database entries, because it sorts correctly alphabetically and doesn't depend on regional habits. Plenty of international forms online quietly use this format.

There's one more style that often shows up in invitations and older documents: spelling it all out as the twelfth of May, two thousand and twenty-six. It's formal but slow and clunky, so outside of wedding invitations you rarely need it.

Writing dates in formal emails

In work emails, what makes the reader judge you isn't whether you pick the British or American camp, but whether you're consistent and avoid the ambiguous form. The table below is organized by context, not by country.

The comma is where learners tend to forget. In American style, there's always a comma between the day and the year: May 12, 2026. If that phrase sits in the middle of a sentence, there's an extra comma after the year too: On May 12, 2026, the office will be closed. In British style, 12 May 2026 has no comma at all, and adding one is wrong.

As for whether to write 12th May 2026 with the ordinal suffix, current style guides recommend dropping the suffix in formal writing, because it's redundant: the reader still reads it as the twelfth of May even when the page just shows the number 12. The form with the suffix isn't wrong and you'll still see it often, but 12 May 2026 is leaner and more modern.

Month names are always capitalized, even in the middle of a sentence, the same rule as day names. When you have to spell out a month name over the phone for someone to write down, knowing the names of the English letters is what you need to have down cold, and the article the English alphabet has the name of every letter along with phonetic transcriptions.

Ordinal numbers that go with dates

The day of the month is always an ordinal number when spoken, even when you write it as a plain number. This rule has no exceptions, and it's the source of most date-pronunciation mistakes. The table below keeps only the tricky cases; the full list from one to thirty-one is in the article ordinal numbers in English.

A compact rule for the whole month: there are only four suffixes — st, nd, rd, and th. A number ending in 1 takes st, ending in 2 takes nd, ending in 3 takes rd, and everything else takes th. The only exceptions are 11, 12, and 13, which take th even though they end in 1, 2, 3, so it's 11th, 12th, 13th.

Saying a date out loud

Between what's written and what's spoken there's a gap that a phonetic table doesn't show. You write 12 May but your mouth says the twelfth of May, adding two words that aren't on the page at all. This is where learners tend to say twelve May, and that sentence sounds wrong immediately.

The difference lies in two small words. The British keep both the and of, Americans drop both and put the month first. Neither camp is wrong, and each understands the other without a hitch. What you need is to pick one style and use it consistently, because mixing the two styles in one sentence is what sounds strangest.

One more detail: when the day stands alone in a context where the month is already clear, people often just say the twelfth without mentioning the month, similar to how Vietnamese speakers just say "mùng mười hai" without naming the month either. The sentence I will send it on the twelfth is completely natural in an exchange where both sides already know which month is being discussed.

How to say years

Years aren't read like ordinary cardinal numbers. People split the four digits into two pairs and read each pair, so 1999 is nineteen ninety-nine, not one thousand nine hundred and ninety-nine. The years around the two-thousand mark are an exception, and that's where confusion is most common.

The hidden rule behind this table is the rule of saving breath. From 2000 to around 2009, splitting into pairs produces awkward strings like twenty oh seven, so people chose two thousand and seven instead. From 2010 onward, twenty ten is a syllable and a half shorter than two thousand and ten, so the split-pair method came back. That's why you hear two different styles depending on the period, with no one ever explaining it.

For years before the Common Era, people add BC after the number and say each letter, so 44 BC is read as forty-four B C. The more neutral form in academic writing is BCE and CE. The letters AD go before the number in traditional usage, giving AD 1066.

What on, in, at go before

These three prepositions divide up their roles by the size of the time span: at for the narrowest point, on for a single day, in for a span wider than a day.

A familiar trap for Vietnamese speakers is using in for a specific date, because in Vietnamese the same word — vào — covers both cases, as in "vào ngày mười hai tháng Năm" ("on the twelfth of May"). In English, whenever there's a day number, use on; when there's no day number and only a month, use in. A sentence combining both still follows that rule: on 12 May in 2026 is grammatically correct but wordy, and in practice people say on 12 May 2026. The full set of time prepositions is laid out in the article English grammar.

Hearing dates in real speech

Write a date wrong and someone asks you to confirm it. Mishear a date and you book the wrong flight. And dates happen to hit three weak spots in Vietnamese listeners' ears all at once, which makes them the piece of information most often missed in work calls.

The first weak spot is the word the. In the twelfth of May, the shrinks down to a faint, blurry /ðə/ and of becomes almost just /ə/, so the whole phrase flows together into one block. A beginner will only catch twelfth and May and lose their bearings, because the start of the phrase sounds like noise.

The second weak spot is the stacked final consonants in fifth, sixth, twelfth. The clusters /fθ/ and /ksθ/ are so hard to produce that even native speakers drop parts of them when talking fast, so the fifth of May comes out sounding almost like fif-ə-May. If you wait to hear a clear th ending before you're willing to recognize the word, you'll wait forever.

The third weak spot, and the costliest one, is pairs that differ by only one syllable or one consonant cluster, the most notorious being the teen-versus-ty ending pair in years.

No trick fixes these three weak spots, because they aren't gaps in knowledge but gaps in reflex. What fixes them is how many times your ear hears the correct form of that sound and gets caught out the moment it mishears. That's the whole point of dictation practice: you listen to a short sentence, transcribe it word for word, and the gap between what you thought you heard and what's actually in the sentence shows up right in front of you.

On WELE, you dictate from a library of more than 800 podcast episodes with transcripts, the system grades word by word, and the words you miss get slotted into spaced-repetition review so they come back around right when you're about to forget them. One sentence with a date that you get wrong three times over three different weeks will teach your ear more than reading ten phonetic tables. Getting started is free, and if you want to know where you stand before picking lessons, the listening level test takes just a few minutes.

The phenomenon of words running together like in the twelfth of May has its own name and clear rules — it isn't native speakers being sloppy. The article connected speech describes each type of linking. And the purely numerical side, from reading number strings to the teen-versus-ty pair, is covered in the article cardinal numbers in English.

Seven common mistakes

1. Sending a plain numeric date abroad. 05/12/2026 has two meanings. Spelling out the month settles it.
2. Writing the month in lowercase. may, december are both wrong. Month names are capitalized in every position in a sentence.
3. Forgetting the comma in American style. May 12 2026 is missing a comma between the day and the year.
4. Adding a comma to British style. 12 May, 2026 mixes the two styles. British style has no comma at all.
5. Reading the day as a cardinal number. Saying twelve May instead of the twelfth of May. The day of the month is always an ordinal number when spoken.
6. Reading a year digit by digit. 2026 is not two zero two six. Split it into twenty twenty-six.
7. Using in before a specific date. In 12 May is wrong, on 12 May is right. In only goes before months, years, seasons.

Frequently asked questions

So what date is 12/05/2026, exactly?

It depends on the writer. If the writer is in the UK, Australia, India, or most of Europe, it's May 12th. If the writer is in the US, it's December 5th. When you receive a numeric date from someone you don't know and both numbers are smaller than thirteen, the only safe move is to ask.

Should I write 12 May 2026 or May 12, 2026?

Choose based on your reader. For American partners, write May 12, 2026 so it looks familiar to them; in every other case, including when you don't know where the reader is, use 12 May 2026. This form is clear to everyone and doesn't need a comma.

Do I have to write st, nd, rd, th after the day number?

Not when writing. Formal writing today favors the plain form 12 May 2026, while 12th May 2026 is still acceptable and still common. But when spoken aloud, the ordinal suffix is always there, whether or not it's written on the page.

How do you say the year 2026 naturally?

Twenty twenty-six is what you'll hear most in podcasts and the news. Two thousand and twenty-six isn't wrong but it's longer and sounds a bit formal. In everyday speech, go with the first one.

How do you write dates on an English CV?

The experience section usually only needs the month and year, with the month spelled out or abbreviated to three letters: May 2023 or May 2023 to Jun 2025. A specific day is only needed for your date of birth if the form asks for it, and in that case spell out the month so a foreign employer doesn't have to guess.

What to do next

Take your actual date of birth and write it out three times in the three forms from the first table, then read all three aloud, remembering to add the and of for British pronunciation. This two-minute exercise clears up most of the fumbling when someone asks you when were you born. Once you've got the date down, add the time to it and put together a complete appointment using the article how to say the time in English.