Introduce DateOnly and TimeOnly types (#50980)

Co-authored-by: Santiago Fernandez Madero <safern@microsoft.com>

Author: tarekgh

src/libraries/System.Private.CoreLib/src/Resources/Strings.resx

@@ -1,17 +1,17 @@
 <?xml version="1.0" encoding="utf-8"?>
 <root>
-  <!-- 
-    Microsoft ResX Schema 
-    
+  <!--
+    Microsoft ResX Schema
+
     Version 2.0
-    
-    The primary goals of this format is to allow a simple XML format 
-    that is mostly human readable. The generation and parsing of the 
-    various data types are done through the TypeConverter classes 
+
+    The primary goals of this format is to allow a simple XML format
+    that is mostly human readable. The generation and parsing of the
+    various data types are done through the TypeConverter classes
     associated with the data types.
-    
+
     Example:
-    
+
     ... ado.net/XML headers & schema ...
     <resheader name="resmimetype">text/microsoft-resx</resheader>
     <resheader name="version">2.0</resheader>
@@ -26,36 +26,36 @@
         <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
         <comment>This is a comment</comment>
     </data>
-                
-    There are any number of "resheader" rows that contain simple 
+
+    There are any number of "resheader" rows that contain simple
     name/value pairs.
-    
-    Each data row contains a name, and value. The row also contains a 
-    type or mimetype. Type corresponds to a .NET class that support 
-    text/value conversion through the TypeConverter architecture. 
-    Classes that don't support this are serialized and stored with the 
+
+    Each data row contains a name, and value. The row also contains a
+    type or mimetype. Type corresponds to a .NET class that support
+    text/value conversion through the TypeConverter architecture.
+    Classes that don't support this are serialized and stored with the
     mimetype set.
-    
-    The mimetype is used for serialized objects, and tells the 
-    ResXResourceReader how to depersist the object. This is currently not 
+
+    The mimetype is used for serialized objects, and tells the
+    ResXResourceReader how to depersist the object. This is currently not
     extensible. For a given mimetype the value must be set accordingly:
-    
-    Note - application/x-microsoft.net.object.binary.base64 is the format 
-    that the ResXResourceWriter will generate, however the reader can 
+
+    Note - application/x-microsoft.net.object.binary.base64 is the format
+    that the ResXResourceWriter will generate, however the reader can
     read any of the formats listed below.
-    
+
     mimetype: application/x-microsoft.net.object.binary.base64
-    value   : The object must be serialized with 
+    value   : The object must be serialized with
             : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
             : and then encoded with base64 encoding.
-    
+
     mimetype: application/x-microsoft.net.object.soap.base64
-    value   : The object must be serialized with 
+    value   : The object must be serialized with
             : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
             : and then encoded with base64 encoding.
 
     mimetype: application/x-microsoft.net.object.bytearray.base64
-    value   : The object must be serialized into a byte array 
+    value   : The object must be serialized into a byte array
             : using a System.ComponentModel.TypeConverter
             : and then encoded with base64 encoding.
     -->
@@ -478,6 +478,14 @@
   <data name="Arg_MustBeChar" xml:space="preserve">
     <value>Object must be of type Char.</value>
   </data>
+  <data name="Arg_MustBeDateOnly" xml:space="preserve">
+    <value>Object must be of type DateOnly.</value>
+    <comment>{Locked="DateOnly"}</comment>
+  </data>
+  <data name="Arg_MustBeTimeOnly" xml:space="preserve">
+    <value>Object must be of type TimeOnly.</value>
+    <comment>{Locked="TimeOnly"}</comment>
+  </data>
   <data name="Arg_MustBeDateTime" xml:space="preserve">
     <value>Object must be of type DateTime.</value>
   </data>
@@ -1123,6 +1131,10 @@
   <data name="Argument_InvalidDateTimeStyles" xml:space="preserve">
     <value>An undefined DateTimeStyles value is being used.</value>
   </data>
+  <data name="Argument_InvalidDateStyles" xml:space="preserve">
+    <value>The only allowed values for the styles are AllowWhiteSpaces, AllowTrailingWhite, AllowLeadingWhite, and AllowInnerWhite.</value>
+    <comment>{Locked="AllowWhiteSpaces, AllowTrailingWhite, AllowLeadingWhite, and AllowInnerWhite"}</comment>
+  </data>
   <data name="Argument_InvalidDigitSubstitution" xml:space="preserve">
     <value>The DigitSubstitution property must be of a valid member of the DigitShapes enumeration. Valid entries include Context, NativeNational or None.</value>
   </data>
@@ -1651,6 +1663,9 @@
   <data name="ArgumentOutOfRange_DateTimeBadTicks" xml:space="preserve">
     <value>Ticks must be between DateTime.MinValue.Ticks and DateTime.MaxValue.Ticks.</value>
   </data>
+  <data name="ArgumentOutOfRange_TimeOnlyBadTicks" xml:space="preserve">
+    <value>Ticks must be between 0 and and TimeOnly.MaxValue.Ticks.</value>
+  </data>
   <data name="ArgumentOutOfRange_DateTimeBadYears" xml:space="preserve">
     <value>Years value must be between +/-10000.</value>
   </data>
@@ -1747,6 +1762,10 @@
   <data name="ArgumentOutOfRange_Month" xml:space="preserve">
     <value>Month must be between one and twelve.</value>
   </data>
+  <data name="ArgumentOutOfRange_DayNumber" xml:space="preserve">
+    <value>Day number must be between 0 and DateOnly.MaxValue.DayNumber.</value>
+    <comment>{Locked="DateOnly.MaxValue.DayNumber"}</comment>
+  </data>
   <data name="ArgumentOutOfRange_MonthParam" xml:space="preserve">
     <value>The Month parameter must be in the range 1 through 12.</value>
   </data>
@@ -2173,6 +2192,17 @@
   <data name="Format_BadDateTime" xml:space="preserve">
     <value>String '{0}' was not recognized as a valid DateTime.</value>
   </data>
+  <data name="Format_BadDateOnly" xml:space="preserve">
+    <value>String '{0}' was not recognized as a valid DateOnly.</value>
+    <comment>{Locked="DateOnly"}</comment>
+  </data>
+  <data name="Format_BadTimeOnly" xml:space="preserve">
+    <value>String '{0}' was not recognized as a valid TimeOnly.</value>
+    <comment>{Locked="TimeOnly"}</comment>
+  </data>
+  <data name="Format_DateTimeOnlyContainsNoneDateParts" xml:space="preserve">
+    <value>String '{0}' contains parts which are not specific to the {1}.</value>
+  </data>
   <data name="Format_BadDateTimeCalendar" xml:space="preserve">
     <value>The DateTime represented by the string '{0}' is not supported in calendar '{1}'.</value>
   </data>

src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitems

@@ -230,6 +230,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)System\CoreLib.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\CurrentSystemTimeZone.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\DataMisalignedException.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)System\DateOnly.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\DateTime.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\DateTimeKind.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\DateTimeOffset.cs" />
@@ -1041,6 +1042,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)System\Threading\WaitHandleExtensions.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\ThreadStaticAttribute.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\ThrowHelper.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)System\TimeOnly.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\TimeoutException.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\TimeSpan.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\TimeZone.cs" />