// calculates the initial difference between today and the target end time public void CalculateDateDifference() { DateTime zeroTime = new DateTime(1, 1, 1); DateTime today = DateTime.Now; DateTime target = this.EventTime; if (target < today) { TimerReached = true; } var diff = DateTimeSpan.CompareDates(today, target); if (TimerReached == false) { days = diff.Days; months = diff.Months; years = diff.Years; hours = diff.Hours; minutes = diff.Minutes; seconds = diff.Seconds; } }
public static DateTimeSpan CompareDates(DateTime date1, DateTime date2) { if (date2 < date1) { var sub = date1; date1 = date2; date2 = sub; } DateTime current = date1; int years = 0; int months = 0; int days = 0; Phase phase = Phase.Years; DateTimeSpan span = new DateTimeSpan(); int officialDay = current.Day; while (phase != Phase.Done) { switch (phase) { case Phase.Years: if (current.AddYears(years + 1) > date2) { phase = Phase.Months; current = current.AddYears(years); } else { years++; } break; case Phase.Months: if (current.AddMonths(months + 1) > date2) { phase = Phase.Days; current = current.AddMonths(months); if (current.Day < officialDay && officialDay <= DateTime.DaysInMonth(current.Year, current.Month)) { current = current.AddDays(officialDay - current.Day); } } else { months++; } break; case Phase.Days: if (current.AddDays(days + 1) > date2) { current = current.AddDays(days); var timespan = date2 - current; span = new DateTimeSpan(years, months, days, timespan.Hours, timespan.Minutes, timespan.Seconds, timespan.Milliseconds); phase = Phase.Done; } else { days++; } break; } } return(span); }