C#计算日期步进

 1            TimeSpan Distance = StartDate - EndDate;
 2                        
 3             var DaysDistance = Distance.Days;
 4             if (Distance.Days % 30 == 0)
 5             {
 6                 c1 = (((Math.Floor((DaysDistance * 1.0) / 30)) -1 ) * 30) + 1;
 7             }
 8             else
 9             {
10                 c1 = ((Math.Floor((DaysDistance * 1.0) / 30)) * 30) + 1;
11             }
12             c2 = (Math.Ceiling((DaysDistance * 1.0) / 30) * 30);