(coreutils) Calendar date items

 
 28.2 Calendar date items
 ========================
 
 A "calendar date item" specifies a day of the year.  It is specified
 differently, depending on whether the month is specified numerically or
 literally.  All these strings specify the same calendar date:
 
      1972-09-24     # ISO 8601.
      72-9-24        # Assume 19xx for 69 through 99,
                     # 20xx for 00 through 68.
      72-09-24       # Leading zeros are ignored.
      9/24/72        # Common U.S. writing.
      24 September 1972
      24 Sept 72     # September has a special abbreviation.
      24 Sep 72      # Three-letter abbreviations always allowed.
      Sep 24, 1972
      24-sep-72
      24sep72
 
    The year can also be omitted.  In this case, the last specified year
 is used, or the current year if none.  For example:
 
      9/24
      sep 24
 
    Here are the rules.
 
    For numeric months, the ISO 8601 format `YEAR-MONTH-DAY' is allowed,
 where YEAR is any positive number, MONTH is a number between 01 and 12,
 and DAY is a number between 01 and 31.  A leading zero must be present
 if a number is less than ten.  If YEAR is 68 or smaller, then 2000 is
 added to it; otherwise, if YEAR is less than 100, then 1900 is added to
 it.  The construct `MONTH/DAY/YEAR', popular in the United States, is
 accepted.  Also `MONTH/DAY', omitting the year.
 
    Literal months may be spelled out in full: `January', `February',
 `March', `April', `May', `June', `July', `August', `September',
 `October', `November' or `December'.  Literal months may be abbreviated
 to their first three letters, possibly followed by an abbreviating dot.
 It is also permitted to write `Sept' instead of `September'.
 
    When months are written literally, the calendar date may be given as
 any of the following:
 
      DAY MONTH YEAR
      DAY MONTH
      MONTH DAY YEAR
      DAY-MONTH-YEAR
 
    Or, omitting the year:
 
      MONTH DAY
Info Catalog
(coreutils) General date syntax
(coreutils) Date input formats
(coreutils) Time of day items
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