1 The rule in plain terms
The Associated Press Stylebook provides clear guidelines for formatting dates and times to ensure consistency across news copy. The core rule is straightforward: abbreviate months with six or more letters when they appear with a specific date. This means January becomes Jan., February becomes Feb., and so on, but March, April, May, June, and July are never abbreviated because they are short enough to spell out. For example, write 'Jan. 15, 2024' but 'March 15, 2024.' When a month is used alone or with just a year, spell it out: 'January 2024' or 'the January meeting.'
For times, AP style calls for numerals with lowercase a.m. or p.m., each followed by a period. Use a colon to separate hours and minutes, but omit ':00' when the time is on the hour. So '3 p.m.' is correct, not '3:00 p.m.' or '3 PM.' Also, avoid redundant phrases like '12 noon' or '12 midnight'; simply use 'noon' or 'midnight.' These rules apply to all general copy unless a specific exception is noted.
The reasoning behind these conventions is rooted in readability and space efficiency. Abbreviating longer months saves space in headlines and tight copy, while spelling out shorter months avoids awkward abbreviations. Lowercase a.m. and p.m. with periods are standard and prevent misreading. Consistently applying these rules helps readers quickly parse dates and times without stumbling over variations.
2 Why editors enforce it
Editors enforce AP date and time style because consistency is the bedrock of credible journalism. When a publication uses 'Jan. 15' in one story and 'January 15' in another, it signals a lack of attention to detail that can erode reader trust. Uniform formatting also aids comprehension: readers scanning a page can instantly recognize a date or time without having to interpret different styles. In a fast-paced news environment, where copy is often repurposed across platforms, adhering to a single style reduces the risk of errors during editing and production.
Moreover, AP style is the industry standard for many English-language news outlets, so following it ensures that copy aligns with expectations from syndication partners, aggregators, and readers accustomed to that format. Editors also appreciate that these rules are practical: they save space in print and digital layouts, and they eliminate ambiguity. For instance, '3 p.m.' is unambiguous, whereas '3PM' could be misread as a military time or a typo. By enforcing these conventions, editors maintain a professional, polished appearance that reflects well on the publication.
Finally, consistent date and time formatting streamlines the editing process. When writers follow the rules, editors spend less time correcting minor style issues and more time focusing on substance, accuracy, and fairness. This efficiency is crucial on deadline, where every minute counts. Thus, enforcing AP style is not about pedantry; it is about producing clean, clear copy that serves the reader.
3 Where writers usually slip
Writers frequently stumble on month abbreviations. A common error is spelling out months that should be abbreviated when paired with a date, such as writing 'January 15, 2024' instead of 'Jan. 15, 2024.' This often happens because writers are accustomed to formal writing or because they forget the six-letter rule. Another slip is abbreviating months that should not be abbreviated, like 'Mar. 15' instead of 'March 15.' Both mistakes disrupt consistency and can make copy look unprofessional.
Time formatting is another minefield. Writers often use uppercase 'AM' and 'PM' without periods, or they add periods but keep them uppercase: '3 P.M.' Both are incorrect in AP style. Some writers also include ':00' for on-the-hour times, writing '3:00 p.m.' instead of '3 p.m.' This redundancy clutters copy and slows reading. Additionally, phrases like '12 noon' or '12 midnight' creep in, which are redundant because noon and midnight are already specific times. Writers may also forget to lowercase a.m. and p.m., especially when they are used to other style guides that capitalize them.
These errors often stem from habit, haste, or confusion with other style manuals. On deadline, writers may default to what they learned in school or see in other publications. The copy desk's job is to catch these slips and correct them consistently, but writers can help by memorizing the core rules and doing a quick self-check before filing. A moment spent verifying date and time format can save an editor valuable time and prevent inconsistencies that distract readers.
4 Applying the rule on deadline
When you are on deadline, applying AP date and time style quickly requires mental shortcuts. First, remember the six-letter rule: if a month has six or more letters, abbreviate it when used with a date. So Jan., Feb., Aug., Sept., Oct., Nov., Dec. are your abbreviations; March, April, May, June, July are spelled out. For times, think 'lowercase, periods, no zeros.' That means '3 p.m.' not '3:00 PM.' If you are unsure, say it aloud: 'three pee em' sounds like 'p.m.,' not 'PM.' Also, drop '12' before noon and midnight.
On deadline, it helps to have a mental checklist: Does the month have six or more letters? Is it with a date? If yes, abbreviate. Is the time on the hour? If yes, omit ':00.' Are a.m. and p.m. lowercase with periods? If not, fix them. Is there a redundant '12' before noon or midnight? Remove it. This checklist can be run in seconds, even under pressure. Another tip is to use your word processor's find-and-replace feature to catch common errors, such as replacing 'AM' with 'a.m.' or 'PM' with 'p.m.' globally, but be careful not to change legitimate uses like 'AM radio.'
Practicing these rules until they become second nature is the best way to ensure accuracy on deadline. The more you write and self-edit, the faster you will internalize the style. When in doubt, consult the AP Stylebook or ask a colleague. But with a little repetition, these formats will become automatic, allowing you to focus on the story rather than the mechanics.
5 Legitimate exceptions
While AP style is designed for general news copy, there are legitimate exceptions where the rules bend. One key exception is in formal invitations, programs, or certain promotional materials where a more formal tone is desired. In those contexts, spelling out months and using uppercase AM/PM may be acceptable, but such exceptions should be rare and deliberate. Another exception is when a month is used alone or with just a year: always spell it out. For example, 'January 2024' is correct, not 'Jan. 2024.' This is because the abbreviation is only needed to save space when a specific date is present.
Times also have exceptions. In military or 24-hour time formats, which are sometimes used in international or technical contexts, AP style does not apply; those formats use numerals without a.m./p.m. and often include leading zeros (e.g., 1500 hours). However, for general news, stick with the 12-hour clock and a.m./p.m. Additionally, when quoting directly from a source, you may preserve the original formatting if it is integral to the quote, but generally, you should adapt to AP style unless it would alter the meaning. Finally, some publications have their own style guides that deviate from AP; in those cases, follow your house style, but for AP-centric copy, these exceptions are limited.
It is important to note that exceptions should not become the norm. The goal is consistency, so if you must deviate, do so knowingly and ensure the rest of the copy adheres to AP style. When in doubt, default to the standard rule. The copy desk can always adjust if a specific exception is warranted, but starting from a consistent baseline makes editing easier.
6 A worked example from the copy desk
Imagine a reporter files a story with the following sentence: 'The event will take place on January 15, 2024, at 3:00 PM.' The copy editor immediately spots several AP style violations. First, 'January' should be abbreviated to 'Jan.' because it has more than six letters and is used with a specific date. Second, '3:00 PM' should be '3 p.m.'—lowercase with periods and no ':00' for an on-the-hour time. The corrected sentence reads: 'The event will take place on Jan. 15, 2024, at 3 p.m.'
Now consider a second sentence: 'The deadline is 12 noon on March 15.' Here, '12 noon' is redundant; it should be simply 'noon.' Also, 'March' is correctly spelled out because it has fewer than six letters. The corrected version: 'The deadline is noon on March 15.' If the year were included, it would be 'March 15, 2024.'
A third example: 'The meeting is scheduled for 9:30 AM on Feb. 3.' The error is 'AM'—it should be 'a.m.' So the corrected sentence is: 'The meeting is scheduled for 9:30 a.m. on Feb. 3.' Note that 'Feb.' is correctly abbreviated. These small edits ensure consistency and clarity. The copy desk might also check for parallel structure: if one date is abbreviated, all similar dates should be. By applying these rules methodically, editors maintain a clean, professional standard throughout the publication.
7 Quick reference and related rules
For quick reference, keep these key points in mind: Abbreviate months with six or more letters when used with a date (Jan., Feb., Aug., Sept., Oct., Nov., Dec.). Spell out March, April, May, June, and July. Spell out all months when used alone or with just a year. Use numerals for years and times. For times, use lowercase a.m. and p.m. with periods, and omit ':00' for on-the-hour times. Use 'noon' and 'midnight' instead of '12 p.m.' and '12 a.m.' Avoid redundant phrases like '12 noon.'
Related AP style rules include: Use commas to set off the year when a date includes month, day, and year (e.g., 'Jan. 15, 2024, was a cold day'). Do not use 'st,' 'nd,' 'rd,' or 'th' with dates (e.g., 'Jan. 15,' not 'Jan. 15th'). For date ranges, use an en dash with no spaces (e.g., 'Jan. 15-20'). When writing decades, use an apostrophe before the abbreviated year (e.g., 'the '90s'). For centuries, spell out and lowercase (e.g., 'the 21st century').
These related rules complement the core date and time guidelines and help maintain overall consistency. Always consult the AP Stylebook for the most up-to-date guidance, as style evolves. But mastering these fundamentals will cover the vast majority of situations you encounter on the copy desk. Remember, the goal is clarity and consistency, so when in doubt, choose the format that is easiest for readers to understand at a glance.