public DateSystem(int hour, int day, DateMonthName month, int year)
{
dateHour = hour;
dateDay = day;
dateMonth = month;
dateYear = year;
dateWeekDay = GetWeakDay(day, month, year);
}
public void ChangeMonth(int months)
{
int targetMonth = (int)dateMonth + months;
if (targetMonth > 11)
{
int restingMonths = targetMonth % 12;
int monthsToYears = (targetMonth - restingMonths) / 12;
targetMonth = restingMonths;
ChangeYear(monthsToYears);
}
dateMonth = (DateMonthName)targetMonth;
}
public DateWeekDayName GetWeakDay(int day, DateMonthName month, int year)
{
//get previous month days and add it
int previousMonthDays = 0;
switch (month)
{
case DateMonthName.February:
previousMonthDays = 31;
break;
case DateMonthName.March:
previousMonthDays = 59;
break;
case DateMonthName.April:
previousMonthDays = 90;
break;
case DateMonthName.May:
previousMonthDays = 120;
break;
case DateMonthName.June:
previousMonthDays = 151;
break;
case DateMonthName.July:
previousMonthDays = 181;
break;
case DateMonthName.August:
previousMonthDays = 212;
break;
case DateMonthName.September:
previousMonthDays = 243;
break;
case DateMonthName.October:
previousMonthDays = 273;
break;
case DateMonthName.November:
previousMonthDays = 304;
break;
case DateMonthName.December:
previousMonthDays = 334;
break;
}
//get get if current year is a leap year
int leapYearOffset = year % 4;
if (leapYearOffset == 0 && (int)month > 1)
{
previousMonthDays += 1;
}
//we dont count the current year for our days count, since it did not end yet and it is calculated above
year -= 1;
leapYearOffset = year % 4;
//get leap years days offset and add it
int leapYearDays = (year - leapYearOffset) / 4;
int totalDays = day + ((year) * 365) + leapYearDays + previousMonthDays;
totalDays %= 7;
DateWeekDayName weekDay = (DateWeekDayName)totalDays;
return(weekDay);
}
