How to check if one DateTime is greater than the other in C

Question

I have two DateTime objects  StartDate and EndDate  I want to make sure StartDate is before EndDate  How is this done in C

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Check out DateTime Compare method

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if  StartDate  lt  EndDate        code   if you just want the dates  and not the time  if  StartDate Date  lt  EndDate Date         code

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if  StartDate gt  EndDate        throw new InvalidOperationException  Ack   StartDate is not before EndDate

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if  StartDate  lt  EndDate        code   if you just want the dates  and not the time  if  StartDate Date  lt  EndDate Date         code

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You can use the overloaded  lt  or   operators   For example   DateTime d1   new DateTime 2008  1  1   DateTime d2   new DateTime 2008  1  2   if  d1  lt  d2

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if  new DateTime 5000   gt  new DateTime 1000                         Console WriteLine  i win

User · Answer

You can use the overloaded  lt  or   operators   For example   DateTime d1   new DateTime 2008  1  1   DateTime d2   new DateTime 2008  1  2   if  d1  lt  d2

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if StartDate  lt  EndDate       DateTime supports normal comparision operators

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if  StartDate gt  EndDate        throw new InvalidOperationException  Ack   StartDate is not before EndDate

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if  new DateTime 5000   gt  new DateTime 1000                         Console WriteLine  i win

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StartDate  lt  EndDate

User · Answer

You can use the overloaded  lt  or   operators   For example   DateTime d1   new DateTime 2008  1  1   DateTime d2   new DateTime 2008  1  2   if  d1  lt  d2

User · Answer

if StartDate  lt  EndDate       DateTime supports normal comparision operators

User · Answer

if  StartDate  lt  EndDate        code   if you just want the dates  and not the time  if  StartDate Date  lt  EndDate Date         code

User · Answer

if  StartDate gt  EndDate        throw new InvalidOperationException  Ack   StartDate is not before EndDate

User · Answer

StartDate  lt  EndDate

User · Answer

if StartDate  lt  EndDate       DateTime supports normal comparision operators

User · Answer

You can use the overloaded  lt  or   operators   For example   DateTime d1   new DateTime 2008  1  1   DateTime d2   new DateTime 2008  1  2   if  d1  lt  d2

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I d like to demonstrate that if you convert to  Date that you don t need to worry about hours mins seconds etc        Test      public void ConvertToDateWillHaveTwoDatesEqual                 DateTime d1   new DateTime 2008  1  1           DateTime d2   new DateTime 2008  1  2           Assert IsTrue d1  lt  d2            DateTime d3   new DateTime 2008  1  1 7 0 0           DateTime d4   new DateTime 2008  1  1 10 0 0           Assert IsTrue d3  lt  d4           Assert IsFalse d3 Date  lt  d4 Date

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I had the same requirement  but when using the accepted answer  it did not fulfill all of my unit tests  The issue for me is when you have a new object  with Start and End dates and you have to set the Start date   at this stage your End date has the minimum date value of 01 01 0001  - this solution did pass all my unit tests       public DateTime Start               get   return  start            set                       if   end Equals DateTime MinValue                                  start   value                            else if  value Date  lt   end Date                                 start   value                            else                               throw new ArgumentException  Start date must be before the End date                                         public DateTime End               get   return  end            set                       if   start Equals DateTime MinValue                                  end   value                            else if  value Date  gt   start Date                                 end   value                            else                               throw new ArgumentException  End date must be after the Start date                                     It does miss the edge case where both Start and End dates can be 01 01 0001 but I m not concerned about that

User · Answer

if  StartDate  lt  EndDate        code   if you just want the dates  and not the time  if  StartDate Date  lt  EndDate Date         code

User · Answer

I had the same requirement  but when using the accepted answer  it did not fulfill all of my unit tests  The issue for me is when you have a new object  with Start and End dates and you have to set the Start date   at this stage your End date has the minimum date value of 01 01 0001  - this solution did pass all my unit tests       public DateTime Start               get   return  start            set                       if   end Equals DateTime MinValue                                  start   value                            else if  value Date  lt   end Date                                 start   value                            else                               throw new ArgumentException  Start date must be before the End date                                         public DateTime End               get   return  end            set                       if   start Equals DateTime MinValue                                  end   value                            else if  value Date  gt   start Date                                 end   value                            else                               throw new ArgumentException  End date must be after the Start date                                     It does miss the edge case where both Start and End dates can be 01 01 0001 but I m not concerned about that

User · Answer

This is probably too late  but to benefit other people who might stumble upon this  I used an extension method do to this using IComparable like this    public static class BetweenExtension               public static bool IsBetween lt T gt  this T value  T min  T max  where T   IComparable                       return  min CompareTo value   lt   0   amp  amp   value CompareTo max   lt   0                     Using this extension method with IComparable makes this method more generic and makes it usable with a wide variety of data types and not just dates   You would use it like this   DateTime start   new DateTime 2015 1 1   DateTime end   new DateTime 2015 12 31   DateTime now   new DateTime 2015 8 20    if now IsBetween start  end            Your code here

User · Answer

Check out DateTime Compare method

User · Answer

if  StartDate gt  EndDate        throw new InvalidOperationException  Ack   StartDate is not before EndDate

User · Answer

StartDate  lt  EndDate

User · Answer

This is probably too late  but to benefit other people who might stumble upon this  I used an extension method do to this using IComparable like this    public static class BetweenExtension               public static bool IsBetween lt T gt  this T value  T min  T max  where T   IComparable                       return  min CompareTo value   lt   0   amp  amp   value CompareTo max   lt   0                     Using this extension method with IComparable makes this method more generic and makes it usable with a wide variety of data types and not just dates   You would use it like this   DateTime start   new DateTime 2015 1 1   DateTime end   new DateTime 2015 12 31   DateTime now   new DateTime 2015 8 20    if now IsBetween start  end            Your code here

User · Answer

StartDate  lt  EndDate

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I d like to demonstrate that if you convert to  Date that you don t need to worry about hours mins seconds etc        Test      public void ConvertToDateWillHaveTwoDatesEqual                 DateTime d1   new DateTime 2008  1  1           DateTime d2   new DateTime 2008  1  2           Assert IsTrue d1  lt  d2            DateTime d3   new DateTime 2008  1  1 7 0 0           DateTime d4   new DateTime 2008  1  1 10 0 0           Assert IsTrue d3  lt  d4           Assert IsFalse d3 Date  lt  d4 Date

User · Answer

if  new DateTime 5000   gt  new DateTime 1000                         Console WriteLine  i win

User · Answer

Check out DateTime Compare method

User · Answer

if StartDate  lt  EndDate       DateTime supports normal comparision operators

User · Answer

if  new DateTime 5000   gt  new DateTime 1000                         Console WriteLine  i win

User · Answer

Check out DateTime Compare method

[c#] How to check if one DateTime is greater than the other in C#

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