The strptime(3) function reads a time and date in a
character string (buf converts it according to the format
specified by format, and stores the information in the
struct tm pointed to by tm.
The format string consists of directives; a directive is
one or more white-space characters followed by an ordinary
character or a conversion specification. (An ordinary character is
any character other than a % or a white-space character; a
conversion specification is one of the following conversion
characters after a % character.) There must be white space or
non-alphanumeric characters between any two conversion
specifications.
Here's how the directives are interpreted while scanning
buf:
For a whitespace directive, strptime(3) scans the input
to the first non-whitespace character or until there are no more
characters. That non-whitespace character remains unscanned.
For an ordinary character directive, strptime(3) scans the next
character from the buffer. If it matches the ordinary character
directive, scanning continues to the next directive. If it doesn't
match, the directive fails, and the differing and subsequent
characters remain unscanned.
For a series of directives that deal only with whitespace (%n,
%t, and whitespace directives), strptime(3) scans up to the
first non-whitespace character or until there are no more
characters. That next non-whitespace character remains
unscanned.
For any other conversion directive, strptime(3) scans characters
until it reaches a charcter matching the next directive or until no
more characters can be scanned. These characters (excluding the one
for the next directive) are compared to the values for the
conversion specifier in the appropriate locale. If it matches,
strptime(3) fills in the values of the tm
structure. If there is no match, the strptime(3) call fails.
The following conversion specifications are supported; for
names, case is not important:
%a
The day of the week in the current locale, either the
abbreviated or full name.
%A
Same as %a.
%b
The month in the current locale, either the abbreviated or the
full name.
%B
Same as %b.
%c
The appropriate date and time representation for the
locale.
%C
The century number as a number from 0-99. Leading zeroes are
permitted but not required.
%d
The day of the month as a number from 1-31. Leading zeroes are
permitted but not required.
%D
Equivalent to %m/%d/%y.
%e
The same as %d.
%h
The same as %b.
%H
The hour in a 24-hour clock (a number from 0-23). Leading
zeroes are permitted but not required.
%I
The hour in a 12-hour clock (a number from 1-12). Leading
zeroes are permitted but not required.
%j
The day of the year as a number from 1-366. Leading zeroes are
permitted but not required.
%m
The month as a number from 1-12. Leading zeroes are permitted
but not required.
%M
The minute of the hour as a number from 0-59. Leading zeroes
are permitted but not required.
%n
Any white space.
%p
The equivalent of a.m. or p.m. in the current locale.
%r
The time in the format %I:%M:%S %p.
%R
The time in the format %H:%M.
%S
The seconds of the current minute as a number from 0-61.
Leading zeroes are permitted but not required.
%t
Any white space.
%T
The time, equivalent to %H:%M:%S.
%U
The week number of the year, as a decimal number in the range
00-53. Sunday is considered the first day of the week. Leading
zeroes are permitted but not required.
%w
The week day as a number in the range 0-6, where 0 represents
Sunday. Leading zeroes are permitted but not required.
%W
Like %U, but Monday is considered the first day of the week.
The week number of the year, as a decimal number in the range
00-53. Leading zeroes are permitted but not required.
%x
The date in the format of the current locale.
%X
The time, in the format of the current locale.
%y
The year within the century, as a digit from 00-99. The week
number of the year, as a decimal number in the range 00-53. If no
century is specified, values from 69-99 refer to the twentieth
century (that is, 1969-1999), and values from 00-68 refer to years
in the twenty-first century (the years 2000 to 2068). Sunday is
considered the first day of the week. Leading zeroes are permitted
but not required.
%Y
The year, including the century, such as 2001 or 1984.
%%
A per cent character.
Some of the directives can be modified by the characters E and O
to indicate that they use an alternative format or specification.
(For locales where this alternative specification doesn't exist,
strptime(3) behaves as if the modifying E or O
weren't present.)
%Ec
The alternative appropriate representative for the date and
time.
%EC
The name of the base year (or time period) in the alternative
representation for the locale.
%Ex
The alternative date representation for the locale.
%EX
The alternative time representation for the locale.
%Ey
The offset from the year (%EC) in the alternative
representation of the year.
%EY
The full year representation in the locale's alternative
representation.
%Od
The day of the month in the alternative representation of the
locale. Leading zeroes are permitted but not required.
%Oe
The same as %Od.
%OH
The hour in the 24-hour clock using the alternative numeric
symbols of the locale.
%OI
The hour in the 12-hour clock using the alternative numeric
symbols of the locale.
%Om
The month using the alternative numeric symbols of the
locale.
%OM
The minutes using the alternative numeric symbols of the
locale.
%OS
The seconds using the alternative numeric symbols of the
locale.
%OU
The week of the year as a number, using the alternative numeric
symbols of the locale. Sunday is considered the first day of the
week.
%Ow
The day of the week as a number using the alternative numeric
symbols of the locale. Sunday is considered day 0.
%OW
The week of the year as a number, using the alternative numeric
symbols of the locale. Monday is considered the first day of the
week.
%Oy
The year, offset from %C, using the alternative numeric symbols
of the locale.
Upon a successful completion, strptime(3) function returns
a pointer to the character following the last character parsed. On
failure, it returns a null pointer.
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