Пример #1
0
 public static DateTimeSpan CalulateDateTimeSpan(this DateTime date, DateTime dateToCompare)
 {
     return(DateTimeSpan.CompareDates(date, dateToCompare));
 }
        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();

            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);
                    }
                    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);
        }