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(Business events, which are increasingly scheduled using groupware calendar applications, are less vulnerable to such ambiguity, since the software itself can be modified to take care of the naming conventions.) Where the a.m.–p.m. It is also not uncommon for AM and PM to be shortened to A and P.
convention is inconvenient typographically (e.g., in dense tables), different fonts or colors are sometimes used instead. The 24-hour clock is used in military and scientific contexts in the United States. military use, 24-hour time is traditionally written without a colon (1800 instead of ) and in spoken language in the Army, but not the Navy or Marine Corps, is followed by the word "hours" (e.g., "eighteen hundred hours").
Alternatively, people might specify "noon" or "midnight", after or instead of .:45 minutes is pronounced as "quarter to", "quarter of", "quarter until", or "quarter till".For example, " a.m." is often pronounced "fifteen till ten" or "quarter to ten", or sometimes "quarter to ten in the morning" (but rarely "quarter to ten a.m.").The Chicago Manual of Style discourages writers from writing all-numeric dates in this format, since it is not comprehensible to readers outside the United States.Many genealogical databases and the Modern Language Association citation style use this format. State Department also use the day-month-year order for human-readable dates and year-month-day for all-numeric encoding, in compliance with the International Civil Aviation Organization's standards for machine-readable travel documents.