Gabriel
Joined: 03 Aug 2009
Posts: 1074
Location: Panama
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| Weekday Calculator |
 Posted: Sun Nov 05, 2017 12:43 pm |
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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);
}
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should make scheduled tasks easier... especially those that don't need to run on weekends!
G.
_________________
CCS PCM 5.078 & CCS PCH 5.093 |
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