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Starting day of month, month length

Does anyone have an algorithm that shows how to calculate the first day of the month, and the number of days? How would I know if a month started on Wednesday?

Re: Starting day of month, month length

Quote:

Originally posted by chrisk5527
Does anyone have an algorithm that shows how to calculate the first day of the month, and the number of days? How would I know if a month started on Wednesday?

I don't know what language you are using but Java's calendar class can do all that and more.

Code:

#include <time.h>                                                      

#include <stdlib.h>

/* parameters 1 - month as a number from 1 - 12  2 - year (from 1900 on) */

/* this does no error checking */

int main(int argc, char *argv[]){

      int year=atoi(argv[2]);

      int month=atoi(argv[1]);

      char tmp[64]={'\0'};

      struct tm  my_tm;

      time_t timer; 

    

      my_tm.tm_year=year-1900;

      my_tm.tm_isdst=0;

      my_tm.tm_sec=1;

      my_tm.tm_min=0;

      my_tm.tm_hour=0;

      my_tm.tm_mon=month;

      timer=mktime(&my_tm);

      strftime(tmp,60,"%A is the first day of %B, %Y",&my_tm);

      printf("%s \n",tmp);

            

}    



/*

     struct tm {

        int tm_sec;     /o second (0-61, allows for leap seconds) o/

        int tm_min;     /o minute (0-59) o/

        int tm_hour;    /o hour (0-23) o/

        int tm_mday;    /o day of the month (1-31) o/

        int tm_mon;     /o month (0-11) o/

        int tm_year;    /o years since 1900 o/

        int tm_wday;    /o day of the week (0-6) o/

        int tm_yday;    /o day of the year (0-365) o/

        int tm_isdst;   /o non-0 if daylight savings time is in effect o/

     };

  

  

  

*/