Calculate the day of the week for any day from 2000 to 2099 SDCC source code-EEWORLD

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// Calculate the day of the week for any day between 2000 and 2099
// year : 00-99
// month: 01-12
// day : 01-31
unsigned char GetWeekFromDay(unsigned char year,unsigned char month,unsigned char day)
{
    if( month == 1 || month == 2 )   
    {
        month += 12;
        if( year> 0 )
            year--;
        else
            year = 4;
    }

    // Returns the day of the week (Monday is 1 and Sunday is 7)
    return 1+(( day + 2*month + 3*(month+1)/5 + year + year/4 ) %7);
}

Keywords：SDCC Reference address：Calculate the day of the week for any day from 2000 to 2099 SDCC source code

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