How to know if a DateTime is between a DateRange in C

Question

I need to know if a Date is between a DateRange  I have three dates      The date range DateTime startDate  DateTime endDate   DateTime dateToCheck    The easy solution is doing a comparison  but is there a smarter way to do this

User · Answer

I   ve found the following library to be the most helpful when doing any kind of date math  I   m still amazed nothing like this is part of the  Net framework    http   www codeproject com Articles 168662 Time-Period-Library-for-NET

User · Answer

You could use extension methods to make it a little more readable   public static class DateTimeExtensions       public static bool InRange this DateTime dateToCheck  DateTime startDate  DateTime endDate                return dateToCheck  gt   startDate  amp  amp  dateToCheck  lt  endDate            Now you can write   dateToCheck InRange startDate  endDate

User · Answer

You can use   return  dateTocheck  gt   startDate  amp  amp  dateToCheck  lt   endDate

User · Answer

Following on from Sergey s answer  I think this more generic version is more in line with Fowler s Range idea  and resolves some of the issues with that answer such as being able to have the Includes methods within a generic class by constraining T as IComparable lt T gt   It s also immutable like what you would expect with types that extend the functionality of other value types like DateTime   public struct Range lt T gt  where T   IComparable lt T gt        public Range T start  T end                Start   start          End   end             public T Start   get         public T End   get         public bool Includes T value    gt  Start CompareTo value   lt   0  amp  amp  End CompareTo value   gt   0       public bool Includes Range lt T gt  range    gt  Start CompareTo range Start   lt   0  amp  amp  End CompareTo range End   gt   0

User · Answer

Nope  doing a simple comparison looks good to me   return dateToCheck  gt   startDate  amp  amp  dateToCheck  lt  endDate    Things to think about though    DateTime is a somewhat odd type in terms of time zones  It could be UTC  it could be  local   it could be ambiguous  Make sure you re comparing apples with apples  as it were  Consider whether your start and end points should be inclusive or exclusive  I ve made the code above treat it as an inclusive lower bound and an exclusive upper bound

User · Answer

Usually I create Fowler s Range implementation for such things   public interface IRange lt T gt        T Start   get        T End   get        bool Includes T value       bool Includes IRange lt T gt  range      public class DateRange   IRange lt DateTime gt                 public DateRange DateTime start  DateTime end                Start   start          End   end             public DateTime Start   get  private set        public DateTime End   get  private set         public bool Includes DateTime value                return  Start  lt   value   amp  amp   value  lt   End              public bool Includes IRange lt DateTime gt  range                return  Start  lt   range Start   amp  amp   range End  lt   End             Usage is pretty simple   DateRange range   new DateRange startDate  endDate   range Includes date

[c#] How to know if a DateTime is between a DateRange in C#

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