Change utc to local time upon json serialization

backend/api/Program.cs

@@ -8,6 +8,7 @@
 using Api.Services;
 using Api.Services.ActionServices;
 using Api.SignalRHubs;
+using Api.Utilities;
 using Azure.Identity;
 using Microsoft.ApplicationInsights.Extensibility.Implementation;
 using Microsoft.AspNetCore.Authentication.JwtBearer;
@@ -126,6 +127,7 @@
         {
             options.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter());
             options.JsonSerializerOptions.ReferenceHandler = ReferenceHandler.IgnoreCycles;
+            options.JsonSerializerOptions.Converters.Add(new DateTimeConverter());
         }
     );
 

backend/api/Utilities/DateTimeConverter.cs

@@ -0,0 +1,26 @@
+using System.Globalization;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Api.Utilities
+{
+    public class DateTimeConverter : JsonConverter<DateTime>
+    {
+        private const string DateFormat = "yyyy-MM-ddTHH:mm:ss.fff";
+
+        public override DateTime Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        {
+            if (!DateTime.TryParse(reader.GetString(), out var value))
+            {
+                throw new JsonException($"Unexpected datetime format: '{reader.GetString()}'");
+            }
+            return value;
+        }
+
+        public override void Write(Utf8JsonWriter writer, DateTime value, JsonSerializerOptions options)
+        {
+            var localDateTime = value.ToLocalTime();
+            writer.WriteStringValue(localDateTime.ToString(DateFormat, CultureInfo.InvariantCulture));
+        }
+    }
+}