Fix #121

Author: cupsos

src/Majorsoft.Blazor.Components.Notifications/HTML5/EpochTimestampDateTimeConverter.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Majorsoft.Blazor.Components.Notifications
+{
+    internal class EpochTimestampDateTimeConverter : JsonConverter<DateTime>
+    {
+        public override DateTime Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        {
+            long ms = reader.GetInt64();
+            return DateTimeOffset.FromUnixTimeMilliseconds(ms).DateTime;
+        }
+
+        public override void Write(Utf8JsonWriter writer, DateTime value, JsonSerializerOptions options)
+        {
+            long ms = new DateTimeOffset(value).ToUnixTimeMilliseconds();
+            writer.WriteNumberValue(ms);
+        }
+    }
+}

src/Majorsoft.Blazor.Components.Notifications/HTML5/HtmlNotificationData.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Text.Json.Serialization;
 
 namespace Majorsoft.Blazor.Components.Notifications
 {
@@ -71,6 +72,7 @@ public abstract class HtmlNotificationData
 		/// <summary>
 		/// Specifies the time at which a notification is created or applicable (past, present, or future).
 		/// </summary>
+		[JsonConverter(typeof(EpochTimestampDateTimeConverter))]
 		public DateTime Timestamp { get; set; } = DateTime.UtcNow;
 
 		/// <summary>