Convert from DateTime to DateTimeOffset instead of parsing it directly

Json.NET is really not meant to be used with DateTimeOffset it seems

Fixes #179

DiscordChatExporter.Core.Services/DataService.Parsers.cs

@@ -118,7 +118,7 @@ namespace DiscordChatExporter.Core.Services
             var title = json["title"]?.Value<string>();
             var description = json["description"]?.Value<string>();
             var url = json["url"]?.Value<string>();
-            var timestamp = json["timestamp"]?.Value<DateTimeOffset>();
+            var timestamp = json["timestamp"]?.Value<DateTime>().ToDateTimeOffset();
 
             // Get color
             var color = json["color"] != null
@@ -165,8 +165,8 @@ namespace DiscordChatExporter.Core.Services
             // Get basic data
             var id = json["id"].Value<string>();
             var channelId = json["channel_id"].Value<string>();
-            var timestamp = json["timestamp"].Value<DateTimeOffset>();
-            var editedTimestamp = json["edited_timestamp"]?.Value<DateTimeOffset?>();
+            var timestamp = json["timestamp"].Value<DateTime>().ToDateTimeOffset();
+            var editedTimestamp = json["edited_timestamp"]?.Value<DateTime?>()?.ToDateTimeOffset();
             var content = json["content"].Value<string>();
             var type = (MessageType) json["type"].Value<int>();
 

DiscordChatExporter.Core.Services/DataService.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.IO;
 using System.Linq;
 using System.Net.Http;
 using System.Net.Http.Headers;
@@ -9,7 +8,6 @@ using DiscordChatExporter.Core.Models;
 using DiscordChatExporter.Core.Services.Exceptions;
 using DiscordChatExporter.Core.Services.Internal;
 using Failsafe;
-using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
 using Tyrrrz.Extensions;
 
@@ -66,12 +64,7 @@ namespace DiscordChatExporter.Core.Services
                         var raw = await response.Content.ReadAsStringAsync();
 
                         // Parse
-                        using (var reader = new JsonTextReader(new StringReader(raw)))
-                        {
-                            reader.DateParseHandling = DateParseHandling.DateTimeOffset;
-
-                            return JToken.Load(reader);
-                        }
+                        return JToken.Parse(raw);
                     }
                 }
             });

DiscordChatExporter.Core.Services/Internal/Extensions.cs

@@ -5,11 +5,11 @@ namespace DiscordChatExporter.Core.Services.Internal
 {
     internal static class Extensions
     {
-        public static string ToSnowflake(this DateTimeOffset date)
+        public static DateTimeOffset ToDateTimeOffset(this DateTime dateTime) => new DateTimeOffset(dateTime);
+
+        public static string ToSnowflake(this DateTimeOffset dateTime)
         {
-            const long epoch = 62135596800000;
-            var unixTime = date.ToUniversalTime().Ticks / TimeSpan.TicksPerMillisecond - epoch;
-            var value = ((ulong) unixTime - 1420070400000UL) << 22;
+            var value = ((ulong) dateTime.ToUnixTimeMilliseconds() - 1420070400000UL) << 22;
             return value.ToString();
         }