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NetBSD 6.1.5 - man page for strftime_z (netbsd section 3)

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STRFTIME(3)			   BSD Library Functions Manual 		      STRFTIME(3)

NAME
     strftime, strftime_z -- format date and time

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <time.h>

     size_t
     strftime(char * restrict buf, size_t maxsize, const char * restrict format,
	 const struct tm * restrict timeptr);

     size_t
     strftime_z(const timezone_t tz, char * restrict buf, size_t maxsize,
	 const char * restrict format, const struct tm * restrict timeptr);

DESCRIPTION
     The strftime() function formats the information from timeptr into the buffer buf according
     to the string pointed to by format.

     The format string consists of zero or more conversion specifications and ordinary charac-
     ters.  All ordinary characters are copied directly into the buffer.  A conversion specifica-
     tion consists of a percent sign '%' and one other character.

     No more than maxsize characters will be placed into the array.  If the total number of
     resulting characters, including the terminating null character, is not more than maxsize,
     strftime() returns the number of characters in the array, not counting the terminating null.
     Otherwise, zero is returned and the contents of the array are undefined.

     Each conversion specification is replaced by the characters as follows which are then copied
     into the buffer.

     %A    is replaced by the locale's full weekday name.

     %a    is replaced by the locale's abbreviated weekday name.

     %B    is replaced by the locale's full month name.

     %b or %h
	   is replaced by the locale's abbreviated month name.

     %C    is replaced by the century (a year divided by 100 and truncated to an integer) as a
	   decimal number [00,99].

     %c    is replaced by the locale's appropriate date and time representation.

     %D    is replaced by the date in the format ``%m/%d/%y''.

     %d    is replaced by the day of the month as a decimal number [01,31].

     %e    is replaced by the day of month as a decimal number [1,31]; single digits are preceded
	   by a blank.

     %F    is replaced by the date in the format ``%Y-%m-%d'' (the ISO 8601 date format).

     %G    is replaced by the ISO 8601 year with century as a decimal number.

     %g    is replaced by the ISO 8601 year without century as a decimal number (00-99).  This is
	   the year that includes the greater part of the week.  (Monday as the first day of a
	   week).  See also the '%V' conversion specification.

     %H    is replaced by the hour (24-hour clock) as a decimal number [00,23].

     %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.

     %p    is replaced by the locale's equivalent of either ``AM'' or ``PM''.

     %R    is replaced by the time in the format ``%H:%M''.

     %r    is replaced by the locale's representation of 12-hour clock time using AM/PM notation.

     %S    is replaced by the second as a decimal number [00,61].  The range of seconds is
	   (00-61) instead of (00-59) to allow for the periodic occurrence of leap seconds and
	   double leap seconds.

     %s    is replaced by the number of seconds since the Epoch, UTC (see mktime(3)).

     %T    is replaced by the time in the format ``%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]. According to ISO 8601 the week containing January 1 is week 1
	   if it has four or more days in the new year, otherwise it is week 53 of the previous
	   year, and the next week is week 1.  The year is given by the '%G' conversion specifi-
	   cation.

     %v    is replaced by the date in the format ``%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 the locale's appropriate time representation.

     %x    is replaced by the locale's appropriate date representation.

     %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 offset from ITC in the ISO 8601 format ``[-]hhmm''.

     %%    is replaced by '%'.

     The strftime_z() function is similar to strftime(), but it also takes a const timezone_t tz
     argument.

SEE ALSO
     date(1), printf(1), ctime(3), printf(3), strptime(3), tm(3)

STANDARDS
     The strftime() function conforms to ISO/IEC 9899:1999 (``ISO C99'').  The '%C', '%D', '%e',
     '%g', '%G', '%h', '%k', '%l', '%n', '%r', '%R', '%s', '%t', '%T', '%u', '%V', and '%v' con-
     version specifications are extensions.

     Use of the ISO 8601 conversions may produce non-intuitive results.  Week 01 of a year is per
     definition the first week which has the Thursday in this year, which is equivalent to the
     week which contains the fourth day of January.  In other words, the first week of a new year
     is the week which has the majority of its days in the new year.  Week 01 might also contain
     days from the previous year and the week before week 01 of a year is the last week (52 or
     53) of the previous year even if it contains days from the new year.  A week starts with
     Monday (day 1) and ends with Sunday (day 7).  For example, the first week of the year 1997
     lasts from 1996-12-30 to 1997-01-05.

BUGS
     There is no conversion specification for the phase of the moon.

     A return value of zero does not necessarily indicate an error.  If the resulting string is
     an empty string, the result value is zero and it is not possible to distinguish between suc-
     cess and error.  For example, in many locales %p yields an empty string.  This problem can
     be avoided by inserting an extra space at the beginning of the format string and then skip-
     ping over it or removing it from the result.

BSD					  April 14, 2011				      BSD
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