Add DateOnly Deconstruct (#327)

Author: SimonCropp

apiCount.include.md

@@ -1 +1 @@
-**API count: 573**
+**API count: 574**

api_list.include.md

@@ -40,6 +40,7 @@
 
 #### DateOnly
 
+ * `void Deconstruct(DateOnly, int, int, int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.dateonly.deconstruct)
  * `bool TryFormat(DateOnly, Span<byte>, int, ReadOnlySpan<char>, IFormatProvider?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.dateonly.tryformat#system-dateonly-tryformat(system-span((system-byte))-system-int32@-system-readonlyspan((system-char))-system-iformatprovider))
  * `bool TryFormat(DateOnly, Span<char>, int, ReadOnlySpan<char>, IFormatProvider?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.dateonly.tryformat#system-dateonly-tryformat(system-span((system-char))-system-int32@-system-readonlyspan((system-char))-system-iformatprovider))
 

readme.md

@@ -12,7 +12,7 @@ The package targets `netstandard2.0` and is designed to support the following ru
  * `net5.0`, `net6.0`, `net7.0`, `net8.0`, `net9.0`, `net10.0`
 
 
-**API count: 573**<!-- singleLineInclude: apiCount. path: /apiCount.include.md -->
+**API count: 574**<!-- singleLineInclude: apiCount. path: /apiCount.include.md -->
 
 
 **See [Milestones](../../milestones?state=closed) for release notes.**
@@ -509,6 +509,7 @@ The class `Polyfill` includes the following extension methods:
 
 #### DateOnly
 
+ * `void Deconstruct(DateOnly, int, int, int)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.dateonly.deconstruct)
  * `bool TryFormat(DateOnly, Span<byte>, int, ReadOnlySpan<char>, IFormatProvider?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.dateonly.tryformat#system-dateonly-tryformat(system-span((system-byte))-system-int32@-system-readonlyspan((system-char))-system-iformatprovider))
  * `bool TryFormat(DateOnly, Span<char>, int, ReadOnlySpan<char>, IFormatProvider?)` [reference](https://learn.microsoft.com/en-us/dotnet/api/system.dateonly.tryformat#system-dateonly-tryformat(system-span((system-char))-system-int32@-system-readonlyspan((system-char))-system-iformatprovider))
 

src/Polyfill/Polyfill_DateOnly.cs

@@ -0,0 +1,27 @@
+// <auto-generated />
+
+#pragma warning disable
+
+namespace Polyfills;
+
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+
+static partial class Polyfill
+{
+#if NET6_0 || NET7_0
+    /// <summary>
+    /// Deconstructs DateOnly by Year, Month, and Day.
+    /// </summary>
+    //Link: https://learn.microsoft.com/en-us/dotnet/api/system.dateonly.deconstruct
+    [EditorBrowsable(EditorBrowsableState.Never)]
+    public static void Deconstruct(this DateOnly target, out int year, out int month, out int day)
+    {
+        year = target.Year;
+        month = target.Month;
+        day = target.Day;
+    }
+#endif
+
+}