private static DateTime?GetStartDateForWeek(DateTime today, RecurringGift gift)
{
var todayDay = (int)today.DayOfWeek;
var giftDay = (int)gift.DayOfWeek;
var days = todayDay == giftDay ? 7 : (giftDay - todayDay + 7) % 7;
return(today.AddDays(days));
}
private static DateTime?GetStartForMonth(DateTime today, RecurringGift gift)
{
var giftDay = gift.Day_Of_Month.Value;
var months = today.Day < giftDay ? 0 : 1;
var updatedGiftMonth = today.AddMonths(months);
if (giftDay > DateTime.DaysInMonth(updatedGiftMonth.Year, updatedGiftMonth.Month))
{
// Can't update this gift, because the day of the gift isn't in the month of the gift, we'll try again next month
return(null);
}
var giftDate = new DateTime(today.Year, today.Month, giftDay);
return(giftDate.AddMonths(months));
}
private static DateTime?CalculateTrialEndDate(RecurringGift gift)
{
var today = DateTime.Today;
return(gift.Frequency_ID == 1 ? GetStartDateForWeek(today, gift) : GetStartForMonth(today, gift));
}