<convention, data> A string unique to a time duration of 24
hours between 2 successive midnights defined by the local time
zone. The specific representation of a date will depend on
which calendar convention is in force; e.g., Gregorian,
Islamic, Japanese, Chinese, Hebrew etc. as well as local
ordering conventions such as UK: day/month/year, US:
month/day/year.
Inputting and outputting dates on computers is greatly
complicated by these localisation issues which is why they
tend to operate on dates internally in some unified form such
as seconds past midnight at the start of the first of January
1970.
Many software and hardware representations of dates allow only
two digits for the year, leading to the year 2000 problem.
Unix manual page: date(1), ctime(3).
(1997-07-11)
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