TimeZoneInfo.AdjustmentRule.Equals Method

Definition

Namespace:

System

Assemblies:

netstandard.dll, System.Runtime.dll

Overloads

Equals(Object)	Indicates whether the current instance is equal to another instance.
Equals(TimeZoneInfo+AdjustmentRule)	Determines whether the current TimeZoneInfo.AdjustmentRule object is equal to a second TimeZoneInfo.AdjustmentRule object.

Equals(Object)

Source:

TimeZoneInfo.AdjustmentRule.cs

Indicates whether the current instance is equal to another instance.

C#

public override bool Equals(object? obj);

Parameters

obj

Object

An instance to compare with this instance.

Returns

Boolean

true if the current instance is equal to the other instance; otherwise, false.

Equals(TimeZoneInfo+AdjustmentRule)

Source:

TimeZoneInfo.AdjustmentRule.cs

Determines whether the current TimeZoneInfo.AdjustmentRule object is equal to a second TimeZoneInfo.AdjustmentRule object.

C#

public bool Equals(TimeZoneInfo.AdjustmentRule? other);

Parameters

other

TimeZoneInfo.AdjustmentRule

The object to compare with the current object.

Returns

Boolean

true if both TimeZoneInfo.AdjustmentRule objects have equal values; otherwise, false.

Implements

Equals(T)

Examples

The following example calls the TimeZoneInfo.AdjustmentRule.Equals(TimeZoneInfo+AdjustmentRule) method to compare the adjustment rules for Central Standard Time with those for Canada Central Standard Time and Mexico Standard Time.

C#

   string timeZoneName = "";
   // Get CST, Canadian CST, and Mexican CST adjustment rules
   TimeZoneInfo.AdjustmentRule[] usCstAdjustments = null;
   TimeZoneInfo.AdjustmentRule[] canCstAdjustments = null;
   TimeZoneInfo.AdjustmentRule[] mexCstAdjustments = null;
   try
   {
      timeZoneName = "Central Standard Time";
      usCstAdjustments = TimeZoneInfo.FindSystemTimeZoneById(timeZoneName).GetAdjustmentRules();
   }
   catch (TimeZoneNotFoundException)
   {
      Console.WriteLine("The {0} time zone is not defined in the registry.", 
                        timeZoneName);
   }                           
   catch (InvalidTimeZoneException)
   {
      Console.WriteLine("Data for the {0} time zone is invalid.", 
                        timeZoneName);
   }
   try
   {
      timeZoneName = "Canada Central Standard Time";
      canCstAdjustments = TimeZoneInfo.FindSystemTimeZoneById(timeZoneName).GetAdjustmentRules();
   }
   catch (TimeZoneNotFoundException)
   {
      Console.WriteLine("The {0} time zone is not defined in the registry.", 
                        timeZoneName);
   }                           
   catch (InvalidTimeZoneException)
   {
      Console.WriteLine("Data for the {0} time zone is invalid.", 
                        timeZoneName);
   }
   try
   {
      timeZoneName = "Central Standard Time (Mexico)";
      mexCstAdjustments = TimeZoneInfo.FindSystemTimeZoneById(timeZoneName).GetAdjustmentRules();
   }   
   catch (TimeZoneNotFoundException)
   {
      Console.WriteLine("The {0} time zone is not defined in the registry.", 
                        timeZoneName);
   }                           
   catch (InvalidTimeZoneException)
   {
      Console.WriteLine("Data for the {0} time zone is invalid.", 
                        timeZoneName);
   }
   // Determine if CST and other time zones have the same rules
   foreach(TimeZoneInfo.AdjustmentRule rule in usCstAdjustments)
   {
      Console.WriteLine("Comparing Central Standard Time rule for {0:d} to {1:d} with:", 
                        rule.DateStart, rule.DateEnd);
      // Compare with Canada Central Standard Time
      if (canCstAdjustments.Length == 0)
      {
         Console.WriteLine("   Canada Central Standard Time has no adjustment rules.");
      }   
      else
      {
         foreach (TimeZoneInfo.AdjustmentRule canRule in canCstAdjustments)
         {
            Console.WriteLine("   Canadian CST for {0:d} to {1:d}: {2}", 
                              canRule.DateStart, canRule.DateEnd, 
                              rule.Equals(canRule) ? "Equal" : "Not Equal");
         }              
      }          

      // Compare with Mexico Central Standard Time
      if (mexCstAdjustments.Length == 0)
      {
         Console.WriteLine("   Mexican Central Standard Time has no adjustment rules.");
      }
      else
      {
         foreach (TimeZoneInfo.AdjustmentRule mexRule in mexCstAdjustments)
         {
            Console.WriteLine("   Mexican CST for {0:d} to {1:d}: {2}", 
                              mexRule.DateStart, mexRule.DateEnd, 
                              rule.Equals(mexRule) ? "Equal" : "Not Equal");
         }              
      }
   }   
   // This code displays the following output to the console:
   // 
   // Comparing Central Standard Time rule for 1/1/0001 to 12/31/9999 with:
   //    Canada Central Standard Time has no adjustment rules.
   //    Mexican CST for 1/1/0001 to 12/31/9999: Equal

This code displays the following output to the console:

Comparing Central Standard Time rule for 1/1/0001 to 12/31/9999 with:  
   Canada Central Standard Time has no adjustment rules.  
   Mexican CST for 1/1/0001 to 12/31/9999: Equal  

Remarks

To determine whether two TimeZoneInfo.AdjustmentRule objects are equal, the Equals(TimeZoneInfo+AdjustmentRule) method compares the member values of each object. Two adjustment rules are equal if they have the same effective dates, the same delta, and identical values for the TimeZoneInfo.TransitionTime objects returned by their DaylightTransitionStart and DaylightTransitionEnd properties.