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Gabriel

Joined: 03 Aug 2009
Posts: 1057
Location: Panama

Weekday Calculator
Posted: Sun Nov 05, 2017 12:43 pm

Hi All,

Just a quick Function I coded today based on this:
https://cs.uwaterloo.ca/~alopez-o/math-faq/node73.html

Pretty self explanatory: call it with year*, month, day as arguments
*(2017 = 17)

the function will return 1 Sunday, 2 Monday ...etc.
It will also print the Day Name to terminal.

 Code: int Weekday(int year,int month,int day) {     // Algorithm taken from: https://cs.uwaterloo.ca/~alopez-o/math-faq/node73.html    const int Month_Value[13]={0,1,4,4,0,2,5,0,3,6,1,4,6}; // Magic Numbers Yeih!    int Temp_Day=0;        Temp_Day=year/4;    Temp_Day+=day;    Temp_Day+=Month_Value[month];    if((year%4)==0)    {       if((month==1)||(month==2))Temp_Day-=1;    }    Temp_Day+=6; //fixed value for 2000´s Only    Temp_Day+=year;    Temp_Day%=7;    if(Temp_Day==0)Temp_Day=7;        switch(Temp_Day)    {       case 1:          fprintf(lcd_putc,"APP - Today is: SUNDAY - %u\r\n",Temp_Day);       break;       case 2:          fprintf(lcd_putc,"APP - Today is: MONDAY - %u\r\n",Temp_Day);       break;       case 3:          fprintf(lcd_putc,"APP - Today is: TUESDAY - %u\r\n",Temp_Day);       break;       case 4:          fprintf(lcd_putc,"APP - Today is: WEDNESDAY - %u\r\n",Temp_Day);       break;       case 5:          fprintf(lcd_putc,"APP - Today is: THURSDAY - %u\r\n",Temp_Day);       break;       case 6:          fprintf(lcd_putc,"APP - Today is: FRIDAY - %u\r\n",Temp_Day);       break;       case 7:          fprintf(lcd_putc,"APP - Today is: SATURDAY - %u\r\n",Temp_Day);       break;       default:             fprintf(lcd_putc,"APP - DAY ERROR - %u\r\n",Temp_Day);             Temp_Day=55;       break;    }    return(Temp_Day); }

should make scheduled tasks easier... especially those that don't need to run on weekends!

G.
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