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# std::asctime

From cppreference.com
< cpp‎ | chrono‎ | c

Defined in header `<ctime>` |  |
char* asctime( const std::tm* time_ptr ); |  |

Converts given calendar time std::tm to a textual representation. 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.

### [edit] Parameters

time_ptr | - | pointer to a std::tm object specifying the time to print

### [edit] 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.

### [edit] Notes

This function returns a pointer to static data and is not thread-safe. POSIX marks this function obsolete and recommends std::strftime instead.

The behavior is undefined if the output string would be longer than 25 characters, if `timeptr->tm_wday` or `timeptr->tm_mon` are not within the expected ranges, or if `timeptr->tm_year` exceeds INT_MAX-1990.

Some implementations handle timeptr->tm_mday==0 as meaning the last day of the preceding month.

### [edit] Example

Run this code

    #include <ctime>
    #include <iostream>

    int main()
    {
        std::time_t result = std::time(NULL);
        std::cout << std::asctime(std::localtime(&result));
    }

Output:

    Tue Dec 27 16:45:52 2011

### [edit] See also

ctime | converts a `time_t` object to a textual representation (function) [edit]
strftime | converts a `tm` object to custom textual representation (function) [edit]
put_time (C++11) | formats and outputs a date/time value according to the specified format (function template) [edit]
C documentation for asctime

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