<P> Date and time notation in the United States differs from that used in other English - speaking countries; in particular, the date notation is not used commonly by virtually every other country in the world . Traditionally, dates are written in the "month - day - year" order ("April 4, 2018") with a comma before and after the year if it is not at the end of a sentence, and time in 12 - hour notation ("11: 00 p.m."). The internationally more common notations are used in some professional environments, such as the military . </P> <P> In the United States, dates are traditionally written in the "month - day - year" order, with neither increasing nor decreasing order of significance . This order is used in both the traditional all - numeric date (e.g., "1 / 21 / 16" or "01 / 21 / 2016") as well as in the expanded form (e.g., "January 21, 2016"--usually spoken with the year as a cardinal number and the day as an ordinal number, e.g., "January twenty - first, two thousand sixteen"), with the historical rationale that the year was often of lesser importance . The most commonly used separator in the all - numeric form is the slash (/), although the hyphen (-) and period (.) have also emerged in the all - numeric format recently due to globalization . 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 . </P>

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