Discussion: Date to Day

Pretty sure this is correct. Feel free to test it out a bit...

This will change a date mm/dd/yy to the day of the week.

integer dayofweek;
integer m=9;  //Jokey Domela's Birthday!
integer d=15;
integer y=6;
integer z;
list days = ["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"];

mathit()
{
    if (m < 3)
    {
        z = y - 1;
    }
    else
    {
        z = y;
    }
    dayofweek = ( llFloor(23 * m/9) + d + 4 + y + llFloor(z/4) - llFloor(z/100) + llFloor(z/400))%7;
    if (m >= 3)
    {
        dayofweek = dayofweek - 2;
    }
}

default
{
    state_entry()
    {
        mathit();
        string day = llList2String(days, dayofweek); 
        llSay(0,(string)day);
    }
}