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Date and time notation in the United States differs from that used in other English-speaking countries. Traditionally, dates are written in the "month day, year" order ("December 12, 1999"), and time in 12-hour notation ("11:00 p.m.") The internationally more common notations are used in some professional environments, such as in the military. ==Date== In the United States, dates are traditionally written in the "month day, year" order, that is, in neither descending nor ascending order of significance. This order is used in both the traditional all-numeric date (e.g., "12/31/99" or "12/31/1999") as well as in the expanded form (e.g., "December 31, 1999") (usually spoken with the year as a cardinal number and the day as an ordinal number; e.g., "December thirty-first, nineteen ninety-nine"), 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 (-) is also common. Periods (.) have also emerged in the all-numeric format recently due to globalization. The day-month-year order has increased in usage notably since the early 1980s. The month is usually written as a name, as in "12-Dec-1999". Many genealogical databases and the Modern Language Association citation style use this format. When filling in the Form I-94 cards and new customs declaration cards used for people entering the U.S., passengers are requested to write pertinent dates in the numeric "dd mm yy" format. Visas and passports issued by the U.S. State Department also use this format. The fully written "day month year" (e.g., 9 April 2005) in written American English is starting to become more common outside of the media industry and legal documents, particularly in university publications and in some international-influenced publications as a means of dealing with ambiguity. However, most Americans write "April 9, 2005". Speaking the "day month year" format is still rarely used, with the exception of the Fourth of July. The ISO 8601 date notation YYYY-MM-DD is popular in computer applications because it reduces the amount of code needed to resolve and compute dates. It is also commonly used in software cases where there are many separately dated items, such as documents or media, because sorting alphabetically will automatically result in the content being listed chronologically. This format may be considered less of a break with tradition by U.S. users, since it preserves the familiar month-day order. Two U.S. standards mandate the use of ISO 8601-like formats: ANSI INCITS 30-1997 (R2008); and NIST FIPS PUB 4-2 (FIPS PUB 4-2 withdrawn in United States 2008-09-02〔 (). National Institute of Standards and Technology.〕), the earliest of which is traceable back to 1968. The ISO 8601 format is also used within the Federal Aviation Administration and military because of the need to eliminate ambiguity. The United States military normally uses a day month year format (e.g., 9 Apr 05 or 9 April 2005) for correspondence. The common US civilian format (e.g., April 9, 2005) is used when corresponding with civilians. The military date notation is similar to the date notation in British English and other variants outside the United States but is read cardinally (e.g. nine April) rather than ordinally. Weeks are generally referred to by the date of some day within that week (e.g., "the week of April 9"), rather than by a week number. Holidays are an exception; such days are typically identified by a week number, relative to the day of the week on which the holiday is fixed, either from the beginning of the month (first, second, etc.) or end (last, and far more rarely penultimate and antepenultimate). For example, Thanksgiving is defined as being on "the fourth Thursday in November." Calendars mostly show Sunday as the first day of the week. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Date and time notation in the United States」の詳細全文を読む スポンサード リンク
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