Added micro and nanosecond support

Author: papafe

src/MongoDB.Bson/Serialization/Serializers/TimeOnlySerializer.cs

@@ -178,10 +178,9 @@ public override void Serialize(BsonSerializationContext context, BsonSerializati
                     bsonWriter.WriteInt32("Minute", value.Minute);
                     bsonWriter.WriteInt32("Second", value.Second);
                     bsonWriter.WriteInt32("Millisecond", value.Millisecond);
-#if NET7_0_OR_GREATER
-                    bsonWriter.WriteInt32("Microsecond", value.Microsecond);
-                    bsonWriter.WriteInt32("Nanosecond", value.Nanosecond);
-#endif
+                    // Microsecond and Nanosecond properties were added in .NET 7
+                    bsonWriter.WriteInt32("Microsecond", GetMicrosecondsComponent(value.Ticks));
+                    bsonWriter.WriteInt32("Nanosecond", GetNanosecondsComponent(value.Ticks));
                     bsonWriter.WriteInt64("Ticks", value.Ticks);
                     bsonWriter.WriteEndDocument();
                     break;
@@ -295,6 +294,18 @@ private long ToInt64(TimeOnly timeOnly, TimeOnlyUnits units)
                 : timeOnly.Ticks / TicksPerUnit(units);
         }
 
+        private int GetNanosecondsComponent(long ticks)
+        {
+            // ticks % 10 * 100
+            return (int)(ticks % TicksPerUnit(TimeOnlyUnits.Microseconds) * 100);
+        }
+
+        private int GetMicrosecondsComponent(long ticks)
+        {
+            // ticks / 10 % 1000
+            return (int)(ticks / TicksPerUnit(TimeOnlyUnits.Microseconds) % 1000);
+        }
+
         // explicit interface implementations
         IBsonSerializer IRepresentationConfigurable.WithRepresentation(BsonType representation)
         {

tests/MongoDB.Bson.Tests/Serialization/Serializers/TimeOnlySerializerTests.cs

@@ -53,7 +53,7 @@ public void Attribute_should_set_correct_units()
             """;
 
             var documentString =  """
-                              { "Hour" : 13, "Minute" : 24, "Second" : 53, "Millisecond" : 0, "Ticks" : 482930000000 }
+                              { "Hour" : 13, "Minute" : 24, "Second" : 53, "Millisecond" : 0, "Microsecond" : 0, "Nanosecond" : 0, "Ticks" : 482930000000 }
                               """;
 
 
@@ -325,9 +325,9 @@ public void GetHashCode_should_return_zero()
         }
 
         [Theory]
-        [InlineData("08:32:05.5946583", """{ "x" : { "Hour" : { "$numberInt" : "8" }, "Minute" : { "$numberInt" : "32" }, "Second" : { "$numberInt" : "5" }, "Millisecond" : { "$numberInt" : "594" }, "Ticks" : { "$numberLong" : "307255946583" } } }""")]
-        [InlineData("00:00:00.0000000", """{ "x" : { "Hour" : { "$numberInt" : "0" }, "Minute" : { "$numberInt" : "0" }, "Second" : { "$numberInt" : "0" }, "Millisecond" : { "$numberInt" : "0" }, "Ticks" : { "$numberLong" : "0" } } }""")]
-        [InlineData("23:59:59.9999999", """{ "x" : { "Hour" : { "$numberInt" : "23" }, "Minute" : { "$numberInt" : "59" }, "Second" : { "$numberInt" : "59" }, "Millisecond" : { "$numberInt" : "999" }, "Ticks" : { "$numberLong" : "863999999999" } } }""")]
+        [InlineData("08:32:05.5946583", """{ "x" : { "Hour" : { "$numberInt" : "8" }, "Minute" : { "$numberInt" : "32" }, "Second" : { "$numberInt" : "5" }, "Millisecond" : { "$numberInt" : "594" }, "Microsecond" : { "$numberInt" : "658" }, "Nanosecond" : { "$numberInt" : "300" }, "Ticks" : { "$numberLong" : "307255946583" } } }""")]
+        [InlineData("00:00:00.0000000", """{ "x" : { "Hour" : { "$numberInt" : "0" }, "Minute" : { "$numberInt" : "0" }, "Second" : { "$numberInt" : "0" }, "Millisecond" : { "$numberInt" : "0" }, "Microsecond" : { "$numberInt" : "0" }, "Nanosecond" : { "$numberInt" : "0" }, "Ticks" : { "$numberLong" : "0" } } }""")]
+        [InlineData("23:59:59.9999999", """{ "x" : { "Hour" : { "$numberInt" : "23" }, "Minute" : { "$numberInt" : "59" }, "Second" : { "$numberInt" : "59" }, "Millisecond" : { "$numberInt" : "999" }, "Microsecond" : { "$numberInt" : "999" }, "Nanosecond" : { "$numberInt" : "900" }, "Ticks" : { "$numberLong" : "863999999999" } } }""")]
         public void Serialize_with_document_representation_should_have_expected_result(string valueString, string expectedResult)
         {
             var subject = new TimeOnlySerializer(BsonType.Document);