Fix achievement state completion date encoding

Author: Crypto137

src/MHServerEmu/Common/Clock.cs

@@ -37,6 +37,22 @@ static Clock()
         /// </summary>
         public static TimeSpan GameTime { get => UtcNowPrecise - GameTimeEpoch; }
 
+        /// <summary>
+        /// Returns a <see cref="System.DateTime"/> corresponding to the provided millisecond calendar time timestamp.
+        /// </summary>
+        public static DateTime DateTimeMillisecondsToDateTime(long timestamp)
+        {
+            return UnixEpoch.AddMilliseconds(timestamp);
+        }
+
+        /// <summary>
+        /// Returns a <see cref="System.DateTime"/> corresponding to the provided microsecond celandar time timestamp.
+        /// </summary>
+        public static DateTime DateTimeMicrosecondsToDateTime(long timestamp)
+        {
+            return UnixEpoch.AddTicks(timestamp * 10);
+        }
+
         /// <summary>
         /// Returns a <see cref="System.DateTime"/> corresponding to the provided millisecond game time timestamp.
         /// </summary>

src/MHServerEmu/Games/Achievements/AchievementState.cs

@@ -1,23 +1,25 @@
 using System.Text;
 using Google.ProtocolBuffers;
 using Gazillion;
+using MHServerEmu.Common;
+using MHServerEmu.Common.Extensions;
 
 namespace MHServerEmu.Games.Achievements
 {
     public class AchievementState
     {
         public uint Id { get; set; }
         public uint Count { get; set; }
-        public ulong CompletedDate { get; set; }
+        public long CompletedDate { get; set; }     // DateTime in microseconds
 
         public AchievementState(CodedInputStream stream)
         {
             Id = stream.ReadRawVarint32();
             Count = stream.ReadRawVarint32();
-            CompletedDate = stream.ReadRawVarint64();
+            CompletedDate = stream.ReadRawInt64();
         }
 
-        public AchievementState(uint id, uint count, ulong completedDate)
+        public AchievementState(uint id, uint count, long completedDate)
         {
             Id = id;
             Count = count;
@@ -28,15 +30,15 @@ public void Encode(CodedOutputStream stream)
         {
             stream.WriteRawVarint64(Id);
             stream.WriteRawVarint64(Count);
-            stream.WriteRawVarint64(CompletedDate);
+            stream.WriteRawInt64(CompletedDate);
         }
 
         public NetMessageAchievementStateUpdate.Types.AchievementState ToNetStruct()
         {
             return NetMessageAchievementStateUpdate.Types.AchievementState.CreateBuilder()
                 .SetId(Id)
                 .SetCount(Count)
-                .SetCompleteddate(CompletedDate)
+                .SetCompleteddate((ulong)CompletedDate)
                 .Build();
         }
 
@@ -45,7 +47,7 @@ public override string ToString()
             StringBuilder sb = new();
             sb.AppendLine($"Id: {Id}");
             sb.AppendLine($"Count: {Count}");
-            sb.AppendLine($"CompletionDate: 0x{CompletedDate:X}");
+            sb.AppendLine($"CompletionDate: {Clock.DateTimeMicrosecondsToDateTime(CompletedDate)}");
             return sb.ToString();
         }
     }