/// <summary>
/// Adds the given number of months to the current date and returns the new Jewish Date
/// </summary>
/// <param name="months"></param>
/// <returns></returns>
public JewishDate AddMonths(int months)
{
int year = this._year,
month = this._month,
day = this._day,
miy = JewishDateCalculations.MonthsInJewishYear(year);
for (var i = 0; i < Math.Abs(months); i++)
{
if (months > 0)
{
month += 1;
if (month > miy)
{
month = 1;
}
if (month == 7)
{
year += 1;
miy = JewishDateCalculations.MonthsInJewishYear(year);
}
}
else if (months < 0)
{
month -= 1;
if (month == 0)
{
month = miy;
}
if (month == 6)
{
year -= 1;
miy = JewishDateCalculations.MonthsInJewishYear(year);
}
}
}
return(new JewishDate(year, month, day));
}
/// <summary>
/// Gets the difference in months between two JewishDates.
/// If the second date is before this one, the number will be negative.
/// </summary>
/// <param name="jd"></param>
/// <returns></returns>
/// <remarks>Ignores Day part. For example, from 29 Kislev to 1 Teves will
/// return 1 even though they are only a day or two apart</remarks>
public int DateDiffMonth(JewishDate jd)
{
int month = jd._month,
year = jd._year,
months = 0;
while (!(year == this._year && month == this._month))
{
if (this.AbsoluteDate > jd.AbsoluteDate)
{
months--;
month++;
if (month > JewishDateCalculations.MonthsInJewishYear(year))
{
month = 1;
}
else if (month == 7)
{
year++;
}
}
else
{
months++;
month--;
if (month < 1)
{
month = JewishDateCalculations.MonthsInJewishYear(year);
}
else if (month == 6)
{
year--;
}
}
}
return(months);
}
