TimeZoneInfo.AdjustmentRule.Equals(TimeZoneInfo+AdjustmentRule) Method

Definition

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

public:
 virtual bool Equals(TimeZoneInfo::AdjustmentRule ^ other);
public bool Equals (TimeZoneInfo.AdjustmentRule other);
override this.Equals : TimeZoneInfo.AdjustmentRule -> bool
Public Function Equals (other As TimeZoneInfo.AdjustmentRule) As Boolean

Parameters

other
TimeZoneInfo.AdjustmentRule

The object to compare with the current object.

Returns

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

Implements

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.

   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
   Dim timeZoneName As String = String.Empty
   ' Get CST, Canadian CST, and Mexican CST adjustment rules
   Dim usCstAdjustments(), canCstAdjustments(), mexCstAdjustments() As TimeZoneInfo.AdjustmentRule
   Try
      timeZoneName = "Central Standard Time"
      usCstAdjustments = TimeZoneInfo.FindSystemTimeZoneById(timeZoneName).GetAdjustmentRules
   Catch e As TimeZoneNotFoundException
      Console.WriteLine("The {0} time zone is not defined in the registry.", timeZoneName)
   Catch e As InvalidTimeZoneException
      Console.WriteLine("Data for the {0} time zone is invalid.", timeZoneName)
   End Try
   Try
      timeZoneName = "Canada Central Standard Time"
      canCstAdjustments = TimeZoneInfo.FindSystemTimeZoneById(timeZoneName).GetAdjustmentRules
   Catch e As TimeZoneNotFoundException
      Console.WriteLine("The {0} time zone is not defined in the registry.", timeZoneName)
   Catch e As InvalidTimeZoneException
      Console.WriteLine("Data for the {0} time zone is invalid.", timeZoneName)
   End Try
   Try
      timeZoneName = "Central Standard Time (Mexico)"
      mexCstAdjustments = TimeZoneInfo.FindSystemTimeZoneById(timeZoneName).GetAdjustmentRules
   Catch e As TimeZoneNotFoundException
      Console.WriteLine("The {0} time zone is not defined in the registry.", timeZoneName)
   Catch e As InvalidTimeZoneException
      Console.WriteLine("Data for the {0} time zone is invalid.", timeZoneName)
   End Try
   ' Determine if CST and other time zones have the same rules
   For Each rule As TimeZoneInfo.AdjustmentRule 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 Then
         Console.WriteLine("   Canada Central Standard Time has no adjustment rules.")
      Else
         For Each canRule As TimeZoneInfo.AdjustmentRule In canCstAdjustments
            Console.WriteLine("   Canadian CST for {0:d} to {1:d}: {2}", _
                              canRule.DateStart, canRule.DateEnd, _
                              IIf(rule.Equals(canRule), "Equal", "Not Equal"))
         Next              
      End If          

      ' Compare with Mexico Central Standard Time
      If mexCstAdjustments.Length = 0 Then
         Console.WriteLine("   Mexican Central Standard Time has no adjustment rules.")
      Else
         For Each mexRule As TimeZoneInfo.AdjustmentRule In mexCstAdjustments
            Console.WriteLine("   Mexican CST for {0:d} to {1:d}: {2}", _
                              mexRule.DateStart, mexRule.DateEnd, _
                              IIf(rule.Equals(mexRule), "Equal", "Not Equal"))
         Next              
      End If
   Next   
   ' 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.

Applies to