Use Universal Time Format

CHANGELOG.md

@@ -1,5 +1,3 @@
 # Latest Changelog
 
-- Fixed 'Distorted Yan' appearing as ???????????
-- Updated Japanese localization (by @nomlasvrc)
-- Updated Simplifed Chinese localization (by @Fallen-ice)
+- Date list now sorts using Universal Time. This prevents unwanted behaviour when 'Daylight Saving' event occurs.

Models/History.cs

@@ -98,6 +98,8 @@ internal void Export()
         public string Guid = string.Empty;
         public string Name = string.Empty;
         public DateTime Timestamp = DateTime.MinValue;
+        [JsonIgnore]
+        public DateTime UniversalTime => Timestamp.ToUniversalTime();
         public bool IsCustom = false;
 
         public string? DisplayName = string.Empty;
@@ -211,7 +213,7 @@ public int CompareTo(History? other)
 
             if (!IsCustom && other.IsCustom) return -1;
             if (IsCustom && !other.IsCustom) return 1;
-            return Timestamp.CompareTo(other.Timestamp);
+            return UniversalTime.CompareTo(other.UniversalTime);
         }
     }
 }

Models/SaveData.cs

@@ -115,7 +115,7 @@ private int FindIndex(History a)
                 if (a.IsCustom && !b.IsCustom) return i;
                 if (b.IsCustom && !a.IsCustom) continue;
 
-                if (b.Timestamp < a.Timestamp)
+                if (b.UniversalTime < a.UniversalTime)
                     return i;
             }
 

Windows/MainWindow.cs

@@ -955,7 +955,7 @@ private void FirstImport() {
                 AddKey(h, i);
                 if (h.IsCustom) continue;
 
-                if (temp == null || temp.Timestamp < h.Timestamp) temp = h;
+                if (temp == null || temp.UniversalTime < h.UniversalTime) temp = h;
             }
 
             if (Settings.Get.AutoCopy) {