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Created September 17, 2010 12:29
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STRFTIME
STRFTIME(3) BSD Library Functions Manual STRFTIME(3)
NAME
strftime, strftime_l -- format date and time
The conversion specifications are copied to the buffer after expansion as
follows:
%A is replaced by national representation of the full weekday name.
%a is replaced by national representation of the abbreviated weekday
name.
%B is replaced by national representation of the full month name.
%b is replaced by national representation of the abbreviated month
name.
%C is replaced by (year / 100) as decimal number; single digits are
preceded by a zero.
%c is replaced by national representation of time and date.
%D is equivalent to ``%m/%d/%y''.
%d is replaced by the day of the month as a decimal number (01-31).
%E* %O*
POSIX locale extensions. The sequences %Ec %EC %Ex %EX %Ey %EY %Od
%Oe %OH %OI %Om %OM %OS %Ou %OU %OV %Ow %OW %Oy are supposed to
provide alternate representations.
Additionly %OB implemented to represent alternative months names
(used standalone, without day mentioned).
%e is replaced by the day of month as a decimal number (1-31); single
digits are preceded by a blank.
%F is equivalent to ``%Y-%m-%d''.
%G is replaced by a year as a decimal number with century. This year
is the one that contains the greater part of the week (Monday as
the first day of the week).
%g is replaced by the same year as in ``%G'', but as a decimal number
without century (00-99).
%H is replaced by the hour (24-hour clock) as a decimal number
(00-23).
%h the same as %b.
%I is replaced by the hour (12-hour clock) as a decimal number
(01-12).
%j is replaced by the day of the year as a decimal number (001-366).
%k is replaced by the hour (24-hour clock) as a decimal number (0-23);
single digits are preceded by a blank.
%l is replaced by the hour (12-hour clock) as a decimal number (1-12);
single digits are preceded by a blank.
%M is replaced by the minute as a decimal number (00-59).
%m is replaced by the month as a decimal number (01-12).
%n is replaced by a newline.
%O* the same as %E*.
%p is replaced by national representation of either "ante meridiem" or
"post meridiem" as appropriate.
%R is equivalent to ``%H:%M''.
%r is equivalent to ``%I:%M:%S %p''.
%S is replaced by the second as a decimal number (00-60).
%s is replaced by the number of seconds since the Epoch, UTC (see
mktime(3)).
%T is equivalent to ``%H:%M:%S''.
%t is replaced by a tab.
%U is replaced by the week number of the year (Sunday as the first day
of the week) as a decimal number (00-53).
%u is replaced by the weekday (Monday as the first day of the week) as
a decimal number (1-7).
%V is replaced by the week number of the year (Monday as the first day
of the week) as a decimal number (01-53). If the week containing
January 1 has four or more days in the new year, then it is week 1;
otherwise it is the last week of the previous year, and the next
week is week 1.
%v is equivalent to ``%e-%b-%Y''.
%W is replaced by the week number of the year (Monday as the first day
of the week) as a decimal number (00-53).
%w is replaced by the weekday (Sunday as the first day of the week) as
a decimal number (0-6).
%X is replaced by national representation of the time.
%x is replaced by national representation of the date.
%Y is replaced by the year with century as a decimal number.
%y is replaced by the year without century as a decimal number
(00-99).
%Z is replaced by the time zone name.
%z is replaced by the time zone offset from UTC; a leading plus sign
stands for east of UTC, a minus sign for west of UTC, hours and
minutes follow with two digits each and no delimiter between them
(common form for RFC 822 date headers).
%+ is replaced by national representation of the date and time (the
format is similar to that produced by date(1)).
%% is replaced by `%'.
SEE ALSO
date(1), printf(1), ctime(3), printf(3), strptime(3), wcsftime(3),
xlocale(3)
STANDARDS
The strftime() function conforms to ISO/IEC 9899:1990 (``ISO C90'') with
a lot of extensions including `%C', `%D', `%E*', `%e', `%G', `%g', `%h',
`%k', `%l', `%n', `%O*', `%R', `%r', `%s', `%T', `%t', `%u', `%V', `%z',
and `%+'.
The peculiar week number and year in the replacements of `%G', `%g', and
`%V' are defined in ISO 8601: 1988.
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