strptime(3C)						   Standard C Library Functions 					      strptime(3C)

NAME

       strptime - date and time conversion

SYNOPSIS

       #include <time.h>

       char *strptime(const char *restrict buf,
	    const char *restrict format, struct tm *restrict tm);

   Non-zeroing Behavior
       cc [flag...]  file... -D_STRPTIME_DONTZERO [library...]
       #include <time.h>

       char *strptime(const char *restrict buf,
	    const char *restrict format, struct tm *restrict tm);

DESCRIPTION

       The  strptime()	function  converts the character string pointed to by buf to values which are stored in the tm structure pointed to by tm,
       using the format specified by format.

       The format argument is composed of zero or more conversion specifications. Each conversion specification is composed  of  a  "%"  (percent)
       character followed by one or two conversion characters which specify the replacement required. One or more white space characters (as spec-
       ified by isspace(3C)) may precede or follow a conversion specification. There must be  white-space  or  other  non-alphanumeric	characters
       between any two conversion specifications.

       A non-zeroing version of strptime(), described below under Non-zeroing Behavior, is provided if _STRPTIME_DONTZERO is defined.

   Conversion Specifications
       The following conversion specifications are supported:

       %%    Same as %.

       %a    Day of week, using the locale's weekday names;  either the abbreviated or full name may be specified.

       %A    Same as %a.

       %b    Month, using the locale's month names;  either the abbreviated or full name may be specified.

       %B    Same as %b.

       %c    Locale's appropriate date and time representation.

       %C    Century  number (the year divided by 100 and truncated to an integer as a decimal number [1,99]); single digits are preceded by 0. If
	     %C is used without the %y specifier, strptime() assumes the year offset is zero in whichever century is specified.   Note the  behav-
	     ior  of %C in the absence of %y is not specified by any of the standards or specifications described on the standards(5) manual page,
	     so portable applications should not depend on it.	This behavior may change in a future release.

       %d    Day of month [1,31]; leading zero is permitted but not required.

       %D    Date as %m/%d/%y.

       %e    Same as %d.

       %h    Same as %b.

       %H    Hour (24-hour clock) [0,23];  leading zero is permitted but not required.

       %I    Hour (12-hour clock) [1,12];  leading zero is permitted but not required.

       %j    Day number of the year [1,366];  leading zeros are permitted but not required.

       %m    Month number [1,12]; leading zero is permitted but not required.

       %M    Minute [0-59]; leading zero is permitted but not required.

       %n    Any white space.

       %p    Locale's equivalent of either a.m. or p.m.

       %r    Appropriate time representation in the 12-hour clock format with %p.

       %R    Time as %H:%M.

   SUSv3
       %S    Seconds [0,60]; leading zero is permitted but not required. The range of values  is [00,60] rather than  [00,59]  to  allow  for  the
	     occasional leap second.

   Default and other standards
       %S    Seconds  [0,61];  leading	zero  is  permitted but not required. The range of values  is [00,61] rather than [00,59] to allow for the
	     occasional leap second and even more occasional double leap second.

       %t    Any white space.

       %T    Time as %H:%M:%S.

       %U    Week number of the year as a decimal number [0,53], with Sunday as the first day of the week;  leading  zero  is  permitted  but  not
	     required.

       %w    Weekday as a decimal number [0,6], with 0 representing Sunday.

       %W    Week  number  of  the  year  as  a decimal number [0,53], with Monday as the first day of the week; leading zero is permitted but not
	     required.

       %x    Locale's appropriate date representation.

       %X    Locale's appropriate time representation.

       %y    Year within century. When a century is not otherwise specified, values in the range 69-99 refer to years  in  the	twentieth  century
	     (1969 to 1999 inclusive); values in the range 00-68 refer to years in the twenty-first century (2000 to 2068 inclusive).

       %Y    Year, including the century (for example, 1993).

       %Z    Time zone name or no characters if no time zone exists.

   Modified Conversion Specifications
       Some  conversion  specifications  can  be modified by the E and O modifier characters to indicate that an alternate format or specification
       should be used rather than the one normally used by the unmodified specification. If the alternate format or specification does	not  exist
       in the current locale, the behavior will be as if the unmodified conversion specification were used.

       %Ec    Locale's alternate appropriate date and time representation.

       %EC    Name of the base year (era) in the locale's alternate representation.

       %Ex    Locale's alternate date representation.

       %EX    Locale's alternate time representation.

       %Ey    Offset from %EC (year only) in the locale's alternate representation.

       %EY    Full alternate year representation.

       %Od    Day of the month using the locale's alternate numeric symbols.

       %Oe    Same as %Od.

       %OH    Hour (24-hour clock) using the locale's alternate numeric symbols.

       %OI    Hour (12-hour clock) using the locale's alternate numeric symbols.

       %Om    Month using the locale's alternate numeric symbols.

       %OM    Minutes using the locale's alternate numeric symbols.

       %OS    Seconds using the locale's alternate numeric symbols.

       %OU    Week number of the year (Sunday as the first day of the week) using the locale's alternate numeric symbols.

       %Ow    Number of the weekday (Sunday=0) using the  locale's alternate numeric symbols.

       %OW    Week number of the year (Monday as the first day of the week) using the locale's alternate numeric symbols.

       %Oy    Year (offset from %C) in the locale's alternate  representation and using the locale's alternate numeric symbols.

   General Specifications
       A  conversion  specification  that  is  an  ordinary character is executed by scanning the next character from the buffer. If the character
       scanned from the buffer differs from the one comprising the specification, the specification fails, and the differing and subsequent  char-
       acters remain unscanned.

       A  series of specifications composed of %n, %t, white-space characters or any combination is executed by scanning up to the first character
       that is not white space (which remains unscanned), or until no more characters can be scanned.  White space is defined by isspace(3C).

       Any other conversion specification is executed by scanning characters until a character matching the  next  specification  is  scanned,	or
       until  no more characters can be scanned. These characters, except the one matching the next specification, are then compared to the locale
       values associated with the conversion specifier.  If a match is found, values for the appropriate  tm structure members are set	to  values
       corresponding to the locale information. If no match is found,  strptime() fails and no more characters are scanned.

       The  month  names,  weekday names, era names, and alternate numeric symbols can consist of any combination of upper and lower case letters.
       The user can request that the input date or time specification be in a specific language by  setting  the  LC_TIME  category  using  setlo-
       cale(3C).

   Non-zeroing Behavior
       In  addition  to  the behavior described above by various standards, the Solaris implementation of strptime() provides the following exten-
       sions. These may change at any time in the future.  Portable applications should not depend on these extended features:

	   o	  If _STRPTIME_DONTZERO is not defined, the tm struct is zeroed on entry and strptime() updates the fields of the tm struct  asso-
		  ciated with the specifiers in the format string.

	   o	  If  _STRPTIME_DONTZERO  is  defined,	strptime() does not zero the tm struct on entry.  Additionally, for some specifiers, strp-
		  time() will use some values in the input tm struct to recalculate the date and re-assign  the  appropriate  members  of  the	tm
		  struct.

       The following describes extended features regardless of whether _STRPTIME_DONTZERO is defined or not defined:

	   o	  If  %j  is  specified,  tm_yday  is  set;   if year is given, and if month and day are not given, strptime() calculates and sets
		  tm_mon, tm_mday, and tm_year.

	   o	  If %U or %W is specified and if weekday and year are given and month and day of month are not given, strptime()  calculates  and
		  sets tm_mon, tm_mday, tm_wday, and tm_year.

       The following describes extended features when _STRPTIME_DONTZERO is not defined:

	   o	  If  %C  is  specified  and  %y  is  not specified, strptime()assumes 0 as the year offset, then calculates the year, and assigns
		  tm_year.

       The following describes extended features when _STRPTIME_DONTZERO is defined:

	   o	  If %C is specified and %y is not specified, strptime() assumes the year offset of the year value of the tm_year  member  of  the
		  input tm struct, then calculates the year and assigns tm_year.

	   o	  If  %j  is  specified  and  neither  %y,  %Y, nor %C are specified, and neither month nor day of month are specified, strptime()
		  assumes the year value given by the value of the tm_year field of the input tm struct.  Then, in addition  to  setting  tm_yday,
		  strptime() uses day-of-year and year values to calculate the month and day-of-month, and assigns tm_month and tm_mday.

	   o	  If  %U  or  %W is specified, and if weekday and/or year are not given, and month and day of month are not given, strptime() will
		  assume the weekday value and/or the year value as the value of the tm_wday field and/or tm_year field of the	input  tm  struct.
		  Then, strptime() will calculate the month and day-of-month and assign tm_month, tm_mday, and/or tm_year.

	   o	  If  %p  is  specified  and if hour is not specified, strptime() will reference, and if needed, update the tm_hour member. If the
		  am_pm input is p.m. and the input tm_hour value is between 0 - 11, strptime() will add 12 hours  and	update	tm_hour.   If  the
		  am_pm input is a.m. and input tm_hour value is between 12 - 23, strptime() will subtract 12 hours and update tm_hour.

RETURN VALUES

       Upon successful completion, strptime() returns a pointer to the character following the last character parsed. Otherwise, a null pointer is
       returned.

USAGE

       Several "same as" formats, and the special processing of white-space characters are provided in order to ease the use of identical   format
       strings for strftime(3C) and strptime().

       The  strptime() function tries to calculate tm_year, tm_mon, and tm_mday when given incomplete input.  This allows the struct tm created by
       strptime() to be passed to mktime(3C) to produce a time_t value for dates and times that are representable by a	time_t.   As  an  example,
       since  mktime() ignores tm_yday, strptime() calculates tm_mon and tm_mday as well as filling in tm_yday when %j is specified without other-
       wise specifying a month and day within month.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+
       |Standard		     |See standards(5). 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ctime(3C), getdate(3C), isspace(3C), mktime(3C), setlocale(3C), strftime(3C), attributes(5), environ(5), standards(5)

SunOS 5.11							    27 Aug 2007 						      strptime(3C)