Add project files.

Compat.Private.Serialization/Compat/Runtime/Serialization/DateTimeOffsetAdapter.cs

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+using Compat.Xml;
+using System;
+using System.Globalization;
+using DataContractAttribute = System.Runtime.Serialization.DataContractAttribute;
+using DataMemberAttribute = System.Runtime.Serialization.DataMemberAttribute;
+
+namespace Compat.Runtime.Serialization
+{
+    [DataContract(Name = "DateTimeOffset", Namespace = "http://schemas.datacontract.org/2004/07/System")]
+    internal struct DateTimeOffsetAdapter
+    {
+        private DateTime _utcDateTime;
+        private short _offsetMinutes;
+
+        public DateTimeOffsetAdapter(DateTime dateTime, short offsetMinutes)
+        {
+            _utcDateTime = dateTime;
+            _offsetMinutes = offsetMinutes;
+        }
+
+        [DataMember(Name = "DateTime", IsRequired = true)]
+        public DateTime UtcDateTime
+        {
+            get => _utcDateTime;
+            set => _utcDateTime = value;
+        }
+
+        [DataMember(Name = "OffsetMinutes", IsRequired = true)]
+        public short OffsetMinutes
+        {
+            get => _offsetMinutes;
+            set => _offsetMinutes = value;
+        }
+
+        public static DateTimeOffset GetDateTimeOffset(DateTimeOffsetAdapter value)
+        {
+            try
+            {
+                switch (value.UtcDateTime.Kind)
+                {
+                    case DateTimeKind.Unspecified:
+                        return new DateTimeOffset(value.UtcDateTime, new TimeSpan(0, value.OffsetMinutes, 0));
+
+                    //DateTimeKind.Utc and DateTimeKind.Local
+                    //Read in deserialized DateTime portion of the DateTimeOffsetAdapter and convert DateTimeKind to Unspecified.
+                    //Apply ofset information read from OffsetMinutes portion of the DateTimeOffsetAdapter.
+                    //Return converted DateTimeoffset object.
+                    default:
+                        DateTimeOffset deserialized = new DateTimeOffset(value.UtcDateTime);
+                        return deserialized.ToOffset(new TimeSpan(0, value.OffsetMinutes, 0));
+                }
+            }
+            catch (ArgumentException exception)
+            {
+                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(XmlExceptionHelper.CreateConversionException(value.ToString(CultureInfo.InvariantCulture), "DateTimeOffset", exception));
+            }
+        }
+
+        public static DateTimeOffsetAdapter GetDateTimeOffsetAdapter(DateTimeOffset value)
+        {
+            return new DateTimeOffsetAdapter(value.UtcDateTime, (short)value.Offset.TotalMinutes);
+        }
+
+        public string ToString(IFormatProvider provider)
+        {
+            return "DateTime: " + UtcDateTime + ", Offset: " + OffsetMinutes;
+        }
+
+    }
+}