subtractMinute method
Implementation
int subtractMinute(Solar solar) {
int days = subtract(solar);
int cm = _hour * 60 + _minute;
int sm = solar.getHour() * 60 + solar.getMinute();
int m = cm - sm;
if (m < 0) {
m += 1440;
days--;
}
m += days * 1440;
return m;
}