asctime() -- convert time structure to string

SYNOPSIS

#include <time.h>

char *asctime(const struct tm *timeptr);

DESCRIPTION

The asctime() function converts the broken-down time in the structure pointed to by timeptr into a string in the form:

Sun Sep 16 01:03:52 1973\n\0

using the equivalent of the following algorithm:

char *asctime(const struct tm *timeptr) {
    static const char wday_name[7][3] = {
        "Sun", "Mon", "Tue", "Wed",
        "Thu", "Fri", "Sat"
    };

    static const char mon_name[12][3] = {
        "Jan", "Feb", "Mar", "Apr", "May", "Jun",
        "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
    };

    static char result[26];

    sprintf(result, "%.3s %.3s%3d %.2d:%.2d:%.2d %d\n",
        wday_name[timeptr->tm_wday], mon_name[timeptr->tm_mon],
        timeptr->tm_mday, timeptr->tm_hour, timeptr->tm_min,
        timeptr->tm_sec, 1900 + timeptr->tm_year);

    return result;
}

This function is not reentrant; see asctime_r() for a reentrant version.

PARAMETERS

timeptr: Points to the buffer of struct tm to be converted to string.

On success, the asctime() function returns a pointer to a static buffer containing the time in the format shown above. This static buffer is shared with ctime(); subsequent calls to ctime() or asctime() overwrite this buffer. On error, it returns NULL.

CONFORMANCE

ANSI/ISO 9899-1990.

MULTITHREAD SAFETY LEVEL

Unsafe.

PORTING ISSUES

Refer to tzset() for details on setting time zone information.

AVAILABILITY

PTC MKS Toolkit for Professional Developers
PTC MKS Toolkit for Professional Developers 64-Bit Edition
PTC MKS Toolkit for Enterprise Developers
PTC MKS Toolkit for Enterprise Developers 64-Bit Edition

asctime()
convert time structure to string

Function