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Showing content from http://www.cplusplus.com/reference/ctime/ctime/ below:

function

<ctime>

ctime 
char* ctime (const time_t * timer);

Convert time_t value to string

Interprets the value pointed by timer as a calendar time and converts it to a C-string containing a human-readable version of the corresponding time and date, in terms of local time.

The returned string has the following format:

Where Www is the weekday, Mmm the month (in letters), dd the day of the month, hh:mm:ss the time, and yyyy the year.

The string is followed by a new-line character ('\n') and terminated with a null-character.

This function is equivalent to:


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asctime(localtime(timer))

For an alternative with custom date formatting, see strftime.

Parameters
timer
Pointer to an object of type time_t that contains a time value.
time_t is an alias of a fundamental arithmetic type capable of representing times as returned by function time.

Return Value A C-string containing the date and time information in a human-readable format.

The returned value points to an internal array whose validity or value may be altered by any subsequent call to asctime or ctime.



Example 
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/* ctime example */
#include <stdio.h>      /* printf */
#include <time.h>       /* time_t, time, ctime */

int main ()
{
  time_t rawtime;

  time (&rawtime);
  printf ("The current local time is: %s", ctime (&rawtime));

  return 0;
}

Output: 
The current local time is: Wed Feb 13 16:06:10 2013


Data races The function accesses the object pointed by timer.
The function also accesses and modifies a shared internal buffer, which may cause data races on concurrent calls to asctime or ctime. Some libraries provide an alternative function that avoids this data race: ctime_r (non-portable).

Exceptions (C++)No-throw guarantee: this function never throws exceptions.

See also
asctime
Convert tm structure to string (function)
gmtime
Convert time_t to tm as UTC time (function)
localtime
Convert time_t to tm as local time (function)
time
Get current time (function)

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