STRFTIME(3C-SVR4)   RISC/os Reference Manual    STRFTIME(3C-SVR4)



NAME
     strftime, cftime, ascftime - convert date and time to string

SYNOPSIS
     #include <time.h>

     sizet *strftime (char *s, sizet maxsize, const char *format,
         const struct tm *timeptr);

     int cftime (char *s, char *format, const timet *clock);

     int ascftime (char *s, const char *format, const struct tm
         *timeptr);

DESCRIPTION
     strftime, ascftime, and cftime place characters into the
     array pointed to by s as controlled by the string pointed to
     by format.  The format string consists of zero or more
     directives and ordinary characters.  All ordinary characters
     (including the terminating null character) are copied
     unchanged into the array.  For strftime, no more than max-
     size characters are placed into the array.

     If format is (char*)0, then the locale's default format is
     used.  For strftime the default format is the same as %c,
     for cftime and ascftime the default format is the same as
     %C.  cftime and ascftime first try to use the value of the
     environment variable CFTIME, and if that is undefined or
     empty, the default format is used.

     Each directive is replaced by appropriate characters as
     described in the following list.  The appropriate characters
     are determined by the LC_TIME category of the program's
     locale and by the values contained in the structure pointed
     to by timeptr for strftime and ascftime, and by the time
     represented by clock for cftime.

     %%        same as %
     %a        locale's abbreviated weekday name
     %A        locale's full weekday name
     %b        locale's abbreviated month name
     %B        locale's full month name
     %c        locale's appropriate date and time representation
     %C        locale's date and time representation as produced
               by date(1)
     %d        day of month (01 - 31)
     %D        date as %m/%d/%y
     %e        day of month (1-31; single digits are preceded by
               a blank)
     %h        locale's abbreviated month name.
     %H        hour (00 - 23)
     %I        hour (01 - 12)



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STRFTIME(3C-SVR4)   RISC/os Reference Manual    STRFTIME(3C-SVR4)



     %j        day number of year (001 - 366)
     %m        month number (01 - 12)
     %M        minute (00 - 59)
     %n        same as \n
     %p        locale's equivalent of either AM or PM
     %r        time as %I:%M:%S [AM|PM]
     %R        time as %H:%M
     %S        seconds (00 - 61), allows for leap seconds
     %t        insert a tab
     %T        time as %H:%M:%S
     %U        week number of year (00 - 53), Sunday is the first
               day of week 1
     %w        weekday number (0 - 6), Sunday = 0
     %W        week number of year (00 - 53), Monday is the first
               day of week 1
     %x        locale's appropriate date representation
     %X        locale's appropriate time representation
     %y        year within century (00 - 99)
     %Y        year as ccyy (e.g. 1986)
     %Z        time zone name or no characters if no time zone
               exists

     The difference between %U and %W lies in which day is
     counted as the first of the week.  Week number 01 is the
     first week in January starting with a Sunday for %U or a
     Monday for %W.  Week number 00 contains those days before
     the first Sunday or Monday in January for %U and %W, respec-
     tively.

     If the total number of resulting characters including the
     terminating null character is not more than maxsize,
     strftime, cftime and ascftime return the number of charac-
     ters placed into the array pointed to by s not including the
     terminating null character.  Otherwise, zero is returned and
     the contents of the array are indeterminate.  cftime and
     ascftime return the number of characters placed into the
     array pointed to by s not including the terminating null
     character.

   Selecting the Output's Language
     By default, the output of strftime, cftime, and ascftime
     appear in US English.  The user can request that the output
     of strftime, cftime or ascftime be in a specific language by
     setting the locale for category LC_TIME in setlocale.

   Timezone
     The timezone is taken from the environment variable TZ [see
     ctime(3C-SVR4) for a description of TZ].

EXAMPLES
     The example illustrates the use of strftime.  It shows what
     the string in str would look like if the structure pointed



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STRFTIME(3C-SVR4)   RISC/os Reference Manual    STRFTIME(3C-SVR4)



     to by tmptr contains the values corresponding to Thursday,
     August 28, 1986 at 12:44:36 in New Jersey.

               strftime (str, strsize, "%A %b %d %j", tmptr)
     This results in str containing: Thursday Aug 28 240.

FILES
     /<systype>/usr/lib/locale/<language>/LC_TIME - file contain-
     ing locale specific date and time information

SEE ALSO
     ctime(3C-SVR4), getenv(3C-SVR4), setlocale(3C-SVR4),
     strftime(4-SVR4), timezone(4-SVR4), environ(5-SVR4).

NOTE
     cftime and ascftime are obsolete.  strftime should be used
     instead.






































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