Convert time_t value to string.
  Converts timer to a string containing time and date adjusted to local time zone in readable format.
  timer is an integer value of type time_t defined as long int by default in most compilers, and usually returned by a call to time function.
  The returned string has the following format:

Www Mmm dd hh:mm:ss yyyy

Parameters.

tmptr

pointer to a time_t value, usually returned by time function.

Return Value.
  A pointer to the string containing the date and time information in readable format.
  The string pointed is statically allocated and shared by ctime and asctime functions. Each time one of these functions is called the content of the string is overwritten.
  ctime also uses internally the buffer used by gmtime and localtime as return value, so a call to this function will overwrite this.

Portability.
  Defined in ANSI-C.

Example.

/* ctime example */
#include <stdio.h>
#include <time.h>

main ()
{
  time_t rawtime;

  time ( &rawtime );
  printf ( "Current date and time are: %s", ctime (&rawtime) );
  
  return 0;
}

See also.
  asctime, gmtime, localtime, time