Where Do You Put the Comma in a Date?
Understanding how to punctuate dates correctly is essential for clear, professional writing. Misplaced commas can confuse readers, undermine credibility, and even change the meaning of a sentence. This guide explains the rules for comma placement in dates across the most common formats, highlights differences between American and British conventions, and offers practical tips to avoid frequent errors.
Understanding Date Formats
Before deciding where a comma belongs, identify the format you are using. The three most prevalent styles are:
- Month‑Day‑Year (MDY) – typical in the United States.
Example: July 4, 2023 - Day‑Month‑Year (DMY) – standard in the United Kingdom, Canada, Australia, and many other countries.
Example: 4 July 2023 - Year‑Month‑Day (YMD) – the ISO 8601 international standard.
Example: 2023-07-04
Each format treats commas differently. In MDY, a comma separates the day from the year; in DMY and YMD, commas are generally omitted unless the date is embedded in a larger sentence that requires punctuation for clarity.
American (Month‑Day‑Year) Convention
Basic Rule
When writing a full date in the MDY style, place a comma after the day and before the year:
- July 4, 2023
- December 25, 2022
When the Date Appears Mid‑Sentence
If the date is not the final element of the sentence, add a second comma after the year to set off the date as a parenthetical element:
- On July 4, 2023, the fireworks lit the sky.
- The conference begins December 25, 2022, and ends January 5, 2023.
When the Date Ends a Sentence
If the date concludes the sentence, do not place a comma after the year:
- The deadline is July 4, 2023.
- She was born on December 25, 2022.
Month and Year Only
When only the month and year are given, no comma is used:
- July 2023
- December 2022
Day of the Week Included
When the day of the week precedes the date, treat the weekday as an introductory element and follow it with a comma; then apply the MDY rule for the rest of the date:
- Monday, July 4, 2023, was a holiday.
- Sunday, December 25, 2022, marked the celebration.
If the weekday follows the date (rare in formal prose), the same comma pattern applies:
- July 4, 2023, Monday (generally avoided; prefer the weekday first).
Ordinal Numbers
Formal writing discourages ordinal suffixes (st, nd, rd, th) in dates, but if they appear, the comma placement remains unchanged:
- July 4th, 2023 (informal)
- July 4, 2023 (preferred)
British (Day‑Month‑Year) Convention
Basic Rule
In the DMY style, commas are not used between the day, month, and year:
- 4 July 2023
- 25 December 2022
When the Date Appears Mid‑Sentence
If the date is embedded in a sentence, you may still need commas for grammatical reasons, but they are not placed between the day and month or between the month and year:
- On 4 July 2023, the fireworks lit the sky.
- The conference begins 25 December 2022 and ends 5 January 2023.
Notice that the comma after the year serves to separate the date from the rest of the sentence, not to separate date components Less friction, more output..
Month and Year Only
As with the American style, no comma appears between month and year:
- July 2023
- December 2022
Day of the Week Included
When the weekday precedes the date, follow it with a comma; the date itself remains unpunctuated:
- Monday, 4 July 2023 was a holiday.
- Sunday, 25 December 2022 marked the celebration.
If the weekday follows the date (again, uncommon), place a comma before the weekday:
- 4 July 2023, Monday (generally reordered for clarity).
Ordinal Numbers
British usage sometimes includes ordinal suffixes, especially in spoken language, but the comma rules stay the same:
- 4th July 2023 (informal)
- 4 July 2023 (formal)
ISO 8601 (Year‑Month‑Day) Format
The ISO 8601 standard is designed for
