void DateTime::adjust(int minutes)
{
long tmp, mod, nxt;
tmp = mm + minutes;
nxt = tmp / 60;// hours
mod = abs(tmp) % 60;
mod = mod * Signum(tmp) + 60;
mod %= 60;
mm = mod;
tmp = nxt + hh;
nxt = tmp / 24;
mod = abs(tmp) % 24;
mod = mod * Signum(tmp) + 24;
mod %= 24;
hh = mod;
tmp = nxt + d;
mod = LengthOfMonth();
if (tmp > mod)
{
tmp -= mod;
d = tmp + 1;
m++;
}
if (tmp < 1)
{
m--;
mod = LengthOfMonth();
d = tmp + mod;
}
tmp=yOff;
if(m == 0)
{
m = 12;
tmp--;
}
if(m > 12)
{
m = 1;
tmp++;
}
tmp += 100;
tmp %= 100;
yOff = tmp;
}
//This date class is designed to take on values which are considered invalid
//I want the date class to act not only as a date structure, but also
//as a way of finding differences of dates (not really fully implemented yet)
//So this function validates the date based on criteria for this specific project
//and guareentees that IsLeapYear() will work as it is expected to.
bool cTimeAndDate::IsValiDate() const {
bool ret=thisyear>1600;
ret=ret && thismonth>=1 && thismonth<=12;
ret=ret && GetDay().ofthemonth>=1 && GetDay().ofthemonth<=LengthOfMonth();
return ret;
}
cTimeAndDate::cTimeAndDate(int m, int d, int y) {
thismonth=m;
thisday.ofthemonth=d;
thisday.oftheyear=0;
thisyear=y;
for(int i=1; i<thismonth; i++)
thisday.oftheyear+=LengthOfMonth(i);
thisday.oftheyear+=thisday.ofthemonth;
// thisday.ofthemillenium
int n=(y-2000)*365+((y-2000!=0)*1+(y-2000)/4);
// thisday.ofthemillenium
n+=thisday.oftheyear;
thisday.oftheweek=(n+5)%7; //plus fudge factor
Refresh();
}
