DateTime.IsDaylightSavingTime() Method in C#

This method is used to indicate whether this instance of DateTime is within the daylight saving time range for the current time zone.

Syntax: public bool IsDaylightSavingTime ();

Return Value: This method returns true if the value of the Kind property is Local or Unspecified and the value of this instance of DateTime is within the daylight saving time range for the local time zone and false if Kind is Utc.

Below programs illustrate the use of DateTime.IsDaylightSavingTime() Method:

Example 1:

// C# program to demonstrate the 
// DateTime.IsDaylightSavingTime() 
// Method 
using System; 
using System.Globalization; 
  
class GFG { 
  
    // Main Method 
    public static void Main() 
    { 
  
        // creating object of DateTime 
        DateTime date = new DateTime(2010, 1, 
                                1, 4, 0, 15); 
  
        // getting Typecode of date 
        // using IsDaylightSavingTime() method; 
        bool value = date.IsDaylightSavingTime(); 
  
        // checking the condition 
        if (value) 
            Console.WriteLine("Instance of DateTime is within the"
                               + " daylight saving time range for"+ 
                                        " the current time zone."); 
  
        else
            Console.WriteLine("Instance of DateTime is not within the"
                              + " daylight saving time range for the "+ 
                                                  "current time zone."); 
    } 
} 

Output:

Instance of DateTime is not within the daylight saving time range for the current time zone.

Example 2:

// C# program to demonstrate the 
// DateTime.IsDaylightSavingTime() 
// Method 
using System; 
using System.Globalization; 
  
class GFG { 
  
    // Main Method 
    public static void Main() 
    { 
  
        // creating object of DateTime 
        DateTime date = new DateTime(1970, 1, 
                                 1, 4, 0, 15); 
  
        // getting Typecode of date 
        // using IsDaylightSavingTime() method; 
        bool value = date.IsDaylightSavingTime(); 
  
        // checking the condition 
        if (value) 
            Console.WriteLine("Instance of DateTime is within the"
                              + " daylight saving time range for "+ 
                                         "the current time zone."); 
  
        else
            Console.WriteLine("Instance of DateTime is not within the"
                              + " daylight saving time range for the "+ 
                                                 "current time zone."); 
    } 
} 

Output:

Instance of DateTime is not within the daylight saving time range for the current time zone.

Reference:

https://docs.microsoft.com/en-us/dotnet/api/system.datetime.isdaylightsavingtime?view=netframework-4.7.2

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