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std::ctime

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< cpp‎ | chrono‎ | c
Revision as of 16:52, 2 November 2012 by P12bot (Talk | contribs)

Defined in header <ctime>
char* ctime( const std::time_t* time );

Converts given time since epoch to a calendar local time and then to a textual representation, as if by calling std::asctime(std::localtime(time)). The resulting string has the following format:

Www Mmm dd hh:mm:ss yyyy
  • Www - the day of the week (one of Mon, Tue, Wed, Thu, Fri, Sat, Sun).
  • Mmm - the month (one of Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec).
  • dd - the day of the month
  • hh - hours
  • mm - minutes
  • ss - seconds
  • yyyy - years

The function does not support localization.

Contents

Parameters

time - pointer to a std::time_t object specifying the time to print

Return value

Pointer to a static null-terminated character string holding the textual representation of date and time. The string may be shared between std::asctime and std::ctime, and may be overwritten on each invocation of any of those functions.

Notes

This function returns a pointer to static data and is not thread-safe. In addition, it modifies the static std::tm object which may be shared with std::gmtime and std::localtime. POSIX marks this function obsolete and recommends std::strftime instead.

The behavior may be undefined for the values of time_t that result in the string longer than 25 characters (e.g. year 10000)

Example

#include <ctime>
#include <iostream>
 
int main()
{
    std::time_t result = std::time(NULL);
    std::cout << std::ctime(&result);
}

Output:

Tue Dec 27 17:21:29 2011

See also

Template:cpp/chrono/c/dcl list asctimeTemplate:cpp/chrono/c/dcl list strftimeTemplate:cpp/io/manip/dcl list put time
C documentation for ctime