Day Number

[Rupert Wood]

dbisnath wrote:

> How does one get the day number e.g. Sunday = 0, Monday = 1 etc ?

1. Use the time() function to get the system time value
2. Use localtime() or gmtime() to parse the time value into a tm struct
3. Read the tm_wday member from the structure.

e.g.

    #include <stdio.h>
    #include <time.h>

    int main(void)
    {
        time_t t;
        struct tm* tmLocal;

        time(&t);
        tmLocal = localtime(&t);
        if (tmLocal != NULL)
        {
            printf("It's day number %d (0=Sunday, etc.)\n",
                tmLocal->tm_wday);
        }
        else
        {
            printf("Error computing day number.\n");
            return 1;
        }

        return 0;
    }

You can get further information on these functions from the manual
pages, i.e. type 'man localtime'.

Rup.