Add, Subtract, and Compare Dates and Times - CSharp Language Basics

CSharp examples for Language Basics:Date Time

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Introduction

Operators Supported by DateTime and TimeSpan

Operator
 TimeSpan
 DateTime
Assignment ( =)


 Because TimeSpan is a structure,
assignment returns a copy, not a
reference
Because DateTime is a structure,
assignment returns a copy, not a
reference
Addition (+)

 Adds two TimeSpan instances

 Adds a TimeSpan instance to a DateTime
instance
Subtraction (-)


 Subtracts one TimeSpan instance from
another TimeSpan instance

Subtracts a TimeSpan instance or a
DateTime instance from a DateTime
instance
Equality (==)

 Compares two TimeSpan instances and
returns true if they are equal
Compares two DateTime instances and
returns true if they are equal
Inequality ( !=)

 Compares two TimeSpan instances and
returns true if they are not equal
Compares two DateTime instances and
returns true if they are not equal
Greater than (>)

 Determines if one TimeSpan instance is
greater than another TimeSpan instance
 Determines if one DateTime instance is
greater than another DateTime instance
Greater than or
equal to (>=)

Determines if one TimeSpan instance is
greater than or equal to another
TimeSpan instance
Determines if one DateTime instance is
greater than or equal to another
DateTime instance
Less than (<)

 Determines if one TimeSpan instance is
less than another TimeSpan instance
Determines if one DateTime instance is
less than another DateTime instance
Less than or
equal to (<=)

 Determines if one TimeSpan instance is
less than or equal to another TimeSpan

 Determines if one DateTime instance is
less than or equal to another DateTime
instance
Unary negation
(-)

Returns a TimeSpan instance with a
negated value of the specified TimeSpan
instance
Not supported


Unary plus (+)
 Returns the TimeSpan instance specified
 Not supported

Demo Code

using System;//from ww w . ja va2s  . c  om
class MainClass
{
   public static void Main()
   {
      // Create a TimeSpan representing 2.5 days.
      TimeSpan timespan1 = new TimeSpan(2, 12, 0, 0);
      // Create a TimeSpan representing 4.5 days.
      TimeSpan timespan2 = new TimeSpan(4, 12, 0, 0);
      // create a TimeSpan representing 3.2 days
      // using the static convenience method
      TimeSpan timespan3 = TimeSpan.FromDays(3.2);
      // Create a TimeSpan representing 1 week.
      TimeSpan oneWeek = timespan1 + timespan2;
      // Create a DateTime with the current date and time.
      DateTime now = DateTime.Now;
      // Create a DateTime representing 1 week ago.
      DateTime past = now - oneWeek;
      // Create a DateTime representing 1 week in the future.
      DateTime future = now + oneWeek;
      // Display the DateTime instances.
      Console.WriteLine("Now   : {0}", now);
      Console.WriteLine("Past  : {0}", past);
      Console.WriteLine("Future: {0}", future);
      // use the comparison operators
      Console.WriteLine("Now is greater than past: {0}", now > past);
      Console.WriteLine("Now is equal to future: {0}", now == future);
   }
}

Result


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