Initial version

EonaCat.gRPC.Api/Helpers/TimeStampContractResolver.cs

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+using EonaCat.Json.Converters;
+using EonaCat.Json.Serialization;
+using System.Reflection;
+
+namespace EonaCat.gRPC.Api.Helpers;
+
+public class TimeStampContractResolver : DefaultContractResolver
+{
+    protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)
+    {
+        var property = base.CreateProperty(member, memberSerialization);
+        if (property.PropertyType == typeof(Google.Protobuf.WellKnownTypes.Timestamp))
+        {
+            property.Converter = new TimeStampConverter();
+        }
+        return property;
+    }
+}
+
+public class TimeStampConverter : DateTimeConverterBase
+{
+    public override object ReadJson(JsonReader reader, Type objectType, object existingValue,
+        JsonSerializer serializer)
+    {
+        var date = DateTime.Parse(reader.Value?.ToString());
+        date = DateTime.SpecifyKind(date, DateTimeKind.Utc);
+        return Google.Protobuf.WellKnownTypes.Timestamp.FromDateTime(date);
+    }
+
+    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
+    {
+        writer.WriteValue(((Google.Protobuf.WellKnownTypes.Timestamp)value).ToString());
+    }
+}