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Linux 2.6 - man page for ctime (linux section 3posix)

CTIME(P)			    POSIX Programmer's Manual				 CTIME(P)

       ctime, ctime_r - convert a time value to a date and time string

       #include <time.h>

       char *ctime(const time_t *clock);

       char *ctime_r(const time_t *clock, char *buf);

       For  ctime():	The  functionality  described  on this reference page is aligned with the
       ISO C standard. Any conflict between the requirements described here and the  ISO C  stan-
       dard is unintentional. This volume of IEEE Std 1003.1-2001 defers to the ISO C standard.

       The ctime() function shall convert the time pointed to by clock, representing time in sec-
       onds since the Epoch, to local time in the form of a string. It shall be equivalent to:


       The asctime(), ctime(), gmtime(), and localtime() functions shall return values in one  of
       two static objects: a broken-down time structure and an array of char. Execution of any of
       the functions may overwrite the information returned in either of these objects by any  of
       the other functions.

       The  ctime()  function  need not be reentrant. A function that is not required to be reen-
       trant is not required to be thread-safe.

       The ctime_r() function shall convert the calendar time pointed to by clock to  local  time
       in  exactly  the  same form as ctime() and put the string into the array pointed to by buf
       (which shall be at least 26 bytes in size) and return buf.

       Unlike ctime(), the thread-safe version ctime_r() is not required to set tzname.

       The ctime() function shall return the pointer returned by asctime() with that  broken-down
       time as an argument.

       Upon  successful  completion, ctime_r() shall return a pointer to the string pointed to by
       buf. When an error is encountered, a null pointer shall be returned.

       No errors are defined.

       The following sections are informative.


       Values for the broken-down time structure can be obtained by calling  gmtime()  or  local-
       time(). The ctime() function is included for compatibility with older implementations, and
       does not support localized date and time formats.  Applications should use the  strftime()
       function to achieve maximum portability.

       The  ctime_r()  function  is thread-safe and shall return values in a user-supplied buffer
       instead of possibly using a static data area that may be overwritten by each call.



       asctime() , clock() , difftime() , gmtime() , localtime() , mktime() , strftime() ,  strp-
       time() , time() , utime() , the Base Definitions volume of IEEE Std 1003.1-2001, <time.h>

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1, 2003 Edition, Standard for Information Technology  --  Portable	Operating  System
       Interface  (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
       the Institute of Electrical and Electronics Engineers, Inc and  The  Open  Group.  In  the
       event  of  any  discrepancy  between this version and the original IEEE and The Open Group
       Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					 CTIME(P)

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