GNU tar 1.34: 7.2 Calendar date items
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7.2 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:
2020-07-20 # ISO 8601. 20-7-20 # Assume 19xx for 69 through 99, # 20xx for 00 through 68 (not recommended). 7/20/2020 # Common U.S. writing. 20 July 2020 20 Jul 2020 # Three-letter abbreviations always allowed. Jul 20, 2020 20-jul-2020 20jul2020
The year can also be omitted. In this case, the last specified year is used, or the current year if none. For example:
7/20 jul 20
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
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