diff --git a/PKHeX.Core/Editing/Saves/Editors/EventWork/Diff/EventWorkDiff.cs b/PKHeX.Core/Editing/Saves/Editors/EventWork/Diff/EventWorkDiff.cs
index 0fca50707..8dd751ba8 100644
--- a/PKHeX.Core/Editing/Saves/Editors/EventWork/Diff/EventWorkDiff.cs
+++ b/PKHeX.Core/Editing/Saves/Editors/EventWork/Diff/EventWorkDiff.cs
@@ -9,7 +9,9 @@ namespace PKHeX.Core;
 /// <summary>
 /// Calculates differences in the Event Blocks between two <see cref="SaveFile"/>.
 /// </summary>
-public sealed class EventBlockDiff<T, T2> : IEventWorkDiff where T : class, IEventFlagArray, IEventWorkArray<T2> where T2 : unmanaged, IEquatable<T2>
+public sealed class EventBlockDiff<TSave, TWorkValue> : IEventWorkDiff
+    where TSave : class, IEventFlagArray, IEventWorkArray<TWorkValue>
+    where TWorkValue : unmanaged, IEquatable<TWorkValue>
 {
     public List<int> SetFlags { get; } = [];
     public List<int> ClearedFlags { get; } = [];
@@ -19,7 +21,7 @@ public sealed class EventBlockDiff<T, T2> : IEventWorkDiff where T : class, IEve
 
     private const int MAX_SAVEFILE_SIZE = 0x10_0000; // 1 MB
 
-    public EventBlockDiff(T s1, T s2) => Diff(s1, s2);
+    public EventBlockDiff(TSave s1, TSave s2) => Diff(s1, s2);
 
     public EventBlockDiff(string f1, string f2)
     {
@@ -37,16 +39,16 @@ public sealed class EventBlockDiff<T, T2> : IEventWorkDiff where T : class, IEve
         Diff(t1, t2);
     }
 
-    private static T? GetBlock(SaveFile s1)
+    private static TSave? GetBlock(SaveFile s1)
     {
-        if (s1 is T t1)
+        if (s1 is TSave t1)
             return t1;
         if (s1 is IEventFlagProvider37 p1)
-            return p1.EventWork as T;
+            return p1.EventWork as TSave;
         return null;
     }
 
-    private static EventWorkDiffCompatibility SanityCheckSaveInfo(T s1, T s2)
+    private static EventWorkDiffCompatibility SanityCheckSaveInfo(TSave s1, TSave s2)
     {
         if (s1.GetType() != s2.GetType())
             return DifferentGameGroup;
@@ -57,7 +59,7 @@ public sealed class EventBlockDiff<T, T2> : IEventWorkDiff where T : class, IEve
         return Valid;
     }
 
-    private void Diff(T s1, T s2)
+    private void Diff(TSave s1, TSave s2)
     {
         Message = SanityCheckSaveInfo(s1, s2);
         if (Message != Valid)
diff --git a/PKHeX.Core/Saves/Access/ISaveBlock8LA.cs b/PKHeX.Core/Saves/Access/ISaveBlock8LA.cs
index 432d91e9f..524999e30 100644
--- a/PKHeX.Core/Saves/Access/ISaveBlock8LA.cs
+++ b/PKHeX.Core/Saves/Access/ISaveBlock8LA.cs
@@ -13,5 +13,5 @@ public interface ISaveBlock8LA
     MyItem8a Items { get; }
     Epoch1970Value AdventureStart { get; }
     Epoch1900DateTimeValue LastSaved { get; }
-    PlayTime8a Played { get; }
+    PlayTime8b Played { get; }
 }
diff --git a/PKHeX.Core/Saves/Access/SaveBlockAccessor8LA.cs b/PKHeX.Core/Saves/Access/SaveBlockAccessor8LA.cs
index f3ff34bc2..c2a5870ae 100644
--- a/PKHeX.Core/Saves/Access/SaveBlockAccessor8LA.cs
+++ b/PKHeX.Core/Saves/Access/SaveBlockAccessor8LA.cs
@@ -17,7 +17,7 @@ public sealed class SaveBlockAccessor8LA(SAV8LA sav) : SCBlockAccessor, ISaveBlo
     public Coordinates8a Coordinates { get; } = new(sav, Block(sav, KCoordinates));
     public Epoch1900DateTimeValue LastSaved { get; } = new(Block(sav, KLastSaved));
     public PlayerFashion8a FashionPlayer { get; } = new(sav, Block(sav, KFashionPlayer));
-    public PlayTime8a Played { get; } = new(sav, Block(sav, KPlayTime));
+    public PlayTime8b Played { get; } = new(sav, Block(sav, KPlayTime));
 
     public int DetectRevision() => HasBlock(0x8184EFB4) ? 1 : 0;
 
diff --git a/PKHeX.Core/Saves/SAV8BS.cs b/PKHeX.Core/Saves/SAV8BS.cs
index b45667e07..f83db7e4c 100644
--- a/PKHeX.Core/Saves/SAV8BS.cs
+++ b/PKHeX.Core/Saves/SAV8BS.cs
@@ -261,9 +261,9 @@ public sealed class SAV8BS : SaveFile, ISaveFileRevision, ITrainerStatRecord, IE
     public override string OT { get => MyStatus.OT; set => MyStatus.OT = value; }
     public override uint Money { get => MyStatus.Money; set => MyStatus.Money = value; }
 
-    public override int PlayedHours { get => Played.PlayedHours; set => Played.PlayedHours = (ushort)value; }
-    public override int PlayedMinutes { get => Played.PlayedMinutes; set => Played.PlayedMinutes = (byte)value; }
-    public override int PlayedSeconds { get => Played.PlayedSeconds; set => Played.PlayedSeconds = (byte)value; }
+    public override int PlayedHours { get => Played.PlayedHours; set => Played.PlayedHours = value; }
+    public override int PlayedMinutes { get => Played.PlayedMinutes; set => Played.PlayedMinutes = value; }
+    public override int PlayedSeconds { get => Played.PlayedSeconds; set => Played.PlayedSeconds = value; }
 
     // Inventory
     public override IReadOnlyList<InventoryPouch> Inventory { get => Items.Inventory; set => Items.Inventory = value; }
diff --git a/PKHeX.Core/Saves/SAV8LA.cs b/PKHeX.Core/Saves/SAV8LA.cs
index a18368f4c..afae78206 100644
--- a/PKHeX.Core/Saves/SAV8LA.cs
+++ b/PKHeX.Core/Saves/SAV8LA.cs
@@ -115,7 +115,7 @@ public sealed class SAV8LA : SaveFile, ISaveBlock8LA, ISCBlockArray, ISaveFileRe
     public Epoch1970Value AdventureStart => Blocks.AdventureStart;
     public Coordinates8a Coordinates => Blocks.Coordinates;
     public Epoch1900DateTimeValue LastSaved => Blocks.LastSaved;
-    public PlayTime8a Played => Blocks.Played;
+    public PlayTime8b Played => Blocks.Played;
     public AreaSpawnerSet8a AreaSpawners => new(Blocks.GetBlock(SaveBlockAccessor8LA.KSpawners));
     #endregion
 
@@ -123,9 +123,9 @@ public sealed class SAV8LA : SaveFile, ISaveBlock8LA, ISCBlockArray, ISaveFileRe
     public override uint Money { get => (uint)Blocks.GetBlockValue(SaveBlockAccessor8LA.KMoney); set => Blocks.SetBlockValue(SaveBlockAccessor8LA.KMoney, value); }
     public override int MaxMoney => 9_999_999;
 
-    public override int PlayedHours { get => Played.PlayedHours; set => Played.PlayedHours = (ushort)value; }
-    public override int PlayedMinutes { get => Played.PlayedMinutes; set => Played.PlayedMinutes = (byte)value; }
-    public override int PlayedSeconds { get => Played.PlayedSeconds; set => Played.PlayedSeconds = (byte)value; }
+    public override int PlayedHours { get => Played.PlayedHours; set => Played.PlayedHours = value; }
+    public override int PlayedMinutes { get => Played.PlayedMinutes; set => Played.PlayedMinutes = value; }
+    public override int PlayedSeconds { get => Played.PlayedSeconds; set => Played.PlayedSeconds = value; }
 
     protected override Span<byte> BoxBuffer => BoxInfo.Data;
     protected override Span<byte> PartyBuffer => PartyInfo.Data;
diff --git a/PKHeX.Core/Saves/Substructures/Gen6/PlayTime6.cs b/PKHeX.Core/Saves/Substructures/Gen6/PlayTime6.cs
index 291b3bcb2..db85e8f25 100644
--- a/PKHeX.Core/Saves/Substructures/Gen6/PlayTime6.cs
+++ b/PKHeX.Core/Saves/Substructures/Gen6/PlayTime6.cs
@@ -3,11 +3,12 @@ using static System.Buffers.Binary.BinaryPrimitives;
 
 namespace PKHeX.Core;
 
-public sealed class PlayTime6 : SaveBlock<SaveFile>
+/// <summary>
+/// Simple 4-byte block storing time played in a save file.
+/// </summary>
+public abstract class PlayTime<TSave>(TSave sav, Memory<byte> raw) : SaveBlock<TSave>(sav, raw)
+    where TSave : SaveFile
 {
-    public PlayTime6(SAV6 sav, Memory<byte> raw) : base(sav, raw) { }
-    public PlayTime6(SAV7 sav, Memory<byte> raw) : base(sav, raw) { }
-
     public int PlayedHours
     {
         get => ReadUInt16LittleEndian(Data);
@@ -26,39 +27,53 @@ public sealed class PlayTime6 : SaveBlock<SaveFile>
         set => Data[3] = (byte)value;
     }
 
-    private uint LastSaved { get => ReadUInt32LittleEndian(Data[0x4..]); set => WriteUInt32LittleEndian(Data[0x4..], value); }
-    private int LastSavedYear { get => (int)(LastSaved & 0xFFF); set => LastSaved = (LastSaved & 0xFFFFF000) | (uint)value; }
-    private int LastSavedMonth { get => (int)((LastSaved >> 12) & 0xF); set => LastSaved = (LastSaved & 0xFFFF0FFF) | (((uint)value & 0xF) << 12); }
-    private int LastSavedDay { get => (int)((LastSaved >> 16) & 0x1F); set => LastSaved = (LastSaved & 0xFFE0FFFF) | (((uint)value & 0x1F) << 16); }
-    private int LastSavedHour { get => (int)((LastSaved >> 21) & 0x1F); set => LastSaved = (LastSaved & 0xFC1FFFFF) | (((uint)value & 0x1F) << 21); }
-    private int LastSavedMinute { get => (int)((LastSaved >> 26) & 0x3F); set => LastSaved = (LastSaved & 0x03FFFFFF) | (((uint)value & 0x3F) << 26); }
-    public string LastSavedTime => $"{LastSavedYear:0000}-{LastSavedMonth:00}-{LastSavedDay:00} {LastSavedHour:00}ː{LastSavedMinute:00}"; // not :
+    public string PlayedTime => $"{PlayedHours:0000}ː{PlayedMinutes:00}ː{PlayedSeconds:00}"; // not :
+}
+
+/// <summary>
+/// Object storing the playtime of a save file as well as the last saved date.
+/// </summary>
+/// <typeparam name="TSave">Type of Save File</typeparam>
+/// <typeparam name="TEpoch">Type of Epoch for the <see cref="LastSaved"/> timestamp.</typeparam>
+public abstract class PlayTimeLastSaved<TSave, TEpoch>(TSave sav, Memory<byte> raw) : PlayTime<TSave>(sav, raw)
+    where TSave : SaveFile
+    where TEpoch : EpochDateTime
+{
+    protected abstract TEpoch LastSaved { get; }
+    public string LastSavedTime => $"{LastSaved.Year:0000}-{LastSaved.Month:00}-{LastSaved.Day:00} {LastSaved.Hour:00}ː{LastSaved.Minute:00}"; // not :
 
     public DateTime? LastSavedDate
     {
-        get => !DateUtil.IsDateValid(LastSavedYear, LastSavedMonth, LastSavedDay)
+        get => !DateUtil.IsDateValid(LastSaved.Year, LastSaved.Month, LastSaved.Day)
             ? null
-            : new DateTime(LastSavedYear, LastSavedMonth, LastSavedDay, LastSavedHour, LastSavedMinute, 0);
+            : LastSaved.Timestamp;
         set
         {
             // Only update the properties if a value is provided.
             if (value is { } dt)
             {
-                LastSavedYear = dt.Year;
-                LastSavedMonth = dt.Month;
-                LastSavedDay = dt.Day;
-                LastSavedHour = dt.Hour;
-                LastSavedMinute = dt.Minute;
+                LastSaved.Timestamp = dt;
             }
             else // Clear the date.
             {
                 // If code tries to access MetDate again, null will be returned.
-                LastSavedYear = 0;
-                LastSavedMonth = 0;
-                LastSavedDay = 0;
-                LastSavedHour = 0;
-                LastSavedMinute = 0;
+                LastSaved.Year = 0;
+                LastSaved.Month = 0;
+                LastSaved.Day = 0;
+                LastSaved.Hour = 0;
+                LastSaved.Minute = 0;
             }
         }
     }
 }
+
+/// <summary>
+/// PlayTime object with a zero-epoch Last Saved timestamp.
+/// </summary>
+public sealed class PlayTime6 : PlayTimeLastSaved<SaveFile, Epoch0000DateTime>
+{
+    public PlayTime6(SAV6 sav, Memory<byte> raw) : base(sav, raw) { }
+    public PlayTime6(SAV7 sav, Memory<byte> raw) : base(sav, raw) { }
+
+    protected override Epoch0000DateTime LastSaved => new(Raw.Slice(0x4, 4));
+}
diff --git a/PKHeX.Core/Saves/Substructures/Gen7/LGPE/PlayTime7b.cs b/PKHeX.Core/Saves/Substructures/Gen7/LGPE/PlayTime7b.cs
index f5a4ed7a3..72802dc3c 100644
--- a/PKHeX.Core/Saves/Substructures/Gen7/LGPE/PlayTime7b.cs
+++ b/PKHeX.Core/Saves/Substructures/Gen7/LGPE/PlayTime7b.cs
@@ -1,55 +1,14 @@
 using System;
-using static System.Buffers.Binary.BinaryPrimitives;
 
 namespace PKHeX.Core;
 
-public sealed class PlayTime7b : SaveBlock<SaveFile>
+/// <summary>
+/// PlayTime object with a 1900-epoch Last Saved timestamp.
+/// </summary>
+public sealed class PlayTime7b : PlayTimeLastSaved<SaveFile, Epoch1900DateTimeValue>
 {
     public PlayTime7b(SAV7b sav, Memory<byte> raw) : base(sav, raw) { }
     public PlayTime7b(SAV8SWSH sav, SCBlock block) : base(sav, block.Data) { }
 
-    public int PlayedHours
-    {
-        get => ReadUInt16LittleEndian(Data);
-        set => WriteUInt16LittleEndian(Data, (ushort)value);
-    }
-
-    public int PlayedMinutes
-    {
-        get => Data[2];
-        set => Data[2] = (byte)value;
-    }
-
-    public int PlayedSeconds
-    {
-        get => Data[3];
-        set => Data[3] = (byte)value;
-    }
-
-    private Epoch1900DateTimeValue LastSaved => new(Raw.Slice(0x4, 4));
-    public string LastSavedTime => LastSaved.DisplayValue;
-
-    public DateTime? LastSavedDate
-    {
-        get => !DateUtil.IsDateValid(LastSaved.Year, LastSaved.Month, LastSaved.Day)
-            ? null
-            : LastSaved.Timestamp;
-        set
-        {
-            // Only update the properties if a value is provided.
-            if (value is { } dt)
-            {
-                LastSaved.Timestamp = dt;
-            }
-            else // Clear the date.
-            {
-                // If code tries to access MetDate again, null will be returned.
-                LastSaved.Year = 0;
-                LastSaved.Month = 0;
-                LastSaved.Day = 0;
-                LastSaved.Hour = 0;
-                LastSaved.Minute = 0;
-            }
-        }
-    }
+    protected override Epoch1900DateTimeValue LastSaved => new(Raw.Slice(0x4, 4));
 }
diff --git a/PKHeX.Core/Saves/Substructures/Gen8/BS/PlayTime8b.cs b/PKHeX.Core/Saves/Substructures/Gen8/BS/PlayTime8b.cs
index 154cca3a7..a91cd2cb1 100644
--- a/PKHeX.Core/Saves/Substructures/Gen8/BS/PlayTime8b.cs
+++ b/PKHeX.Core/Saves/Substructures/Gen8/BS/PlayTime8b.cs
@@ -1,22 +1,14 @@
 using System;
 using System.ComponentModel;
-using static System.Buffers.Binary.BinaryPrimitives;
 
 namespace PKHeX.Core;
 
 /// <summary>
-/// Playtime storage
+/// PlayTime object without a Last Saved timestamp.
 /// </summary>
 [TypeConverter(typeof(ExpandableObjectConverter))]
-public sealed class PlayTime8b(SAV8BS sav, Memory<byte> raw) : SaveBlock<SAV8BS>(sav, raw)
+public sealed class PlayTime8b : PlayTime<SaveFile>
 {
-    public ushort PlayedHours
-    {
-        get => ReadUInt16LittleEndian(Data);
-        set => WriteUInt16LittleEndian(Data, value);
-    }
-
-    public byte PlayedMinutes { get => Data[2]; set => Data[2] = value; }
-    public byte PlayedSeconds { get => Data[3]; set => Data[3] = value; }
-    public string LastSavedTime => $"{PlayedHours:0000}ː{PlayedMinutes:00}ː{PlayedSeconds:00}"; // not :
+    public PlayTime8b(SAV8BS sav, Memory<byte> raw) : base(sav, raw) { }
+    public PlayTime8b(SAV8LA sav, SCBlock block) : base(sav, block.Data) { }
 }
diff --git a/PKHeX.Core/Saves/Substructures/Gen8/LA/PlayTime8a.cs b/PKHeX.Core/Saves/Substructures/Gen8/LA/PlayTime8a.cs
deleted file mode 100644
index f33460abf..000000000
--- a/PKHeX.Core/Saves/Substructures/Gen8/LA/PlayTime8a.cs
+++ /dev/null
@@ -1,22 +0,0 @@
-using System;
-using System.ComponentModel;
-using static System.Buffers.Binary.BinaryPrimitives;
-
-namespace PKHeX.Core;
-
-/// <summary>
-/// Stores the amount of time the save file has been played.
-/// </summary>
-[TypeConverter(typeof(ExpandableObjectConverter))]
-public sealed class PlayTime8a(SAV8LA sav, SCBlock block) : SaveBlock<SAV8LA>(sav, block.Data)
-{
-    public ushort PlayedHours
-    {
-        get => ReadUInt16LittleEndian(Data);
-        set => WriteUInt16LittleEndian(Data, value);
-    }
-
-    public byte PlayedMinutes { get => Data[2]; set => Data[2] = value; }
-    public byte PlayedSeconds { get => Data[3]; set => Data[3] = value; }
-    public string PlayedTime => $"{PlayedHours:0000}ː{PlayedMinutes:00}ː{PlayedSeconds:00}"; // not :
-}
diff --git a/PKHeX.Core/Saves/Substructures/Gen9/PlayTime9.cs b/PKHeX.Core/Saves/Substructures/Gen9/PlayTime9.cs
index fe9603580..fc8509700 100644
--- a/PKHeX.Core/Saves/Substructures/Gen9/PlayTime9.cs
+++ b/PKHeX.Core/Saves/Substructures/Gen9/PlayTime9.cs
@@ -1,4 +1,3 @@
-using System;
 using static System.Buffers.Binary.BinaryPrimitives;
 
 namespace PKHeX.Core;
diff --git a/PKHeX.Core/Saves/Substructures/Time/Epoch0000DateTime.cs b/PKHeX.Core/Saves/Substructures/Time/Epoch0000DateTime.cs
new file mode 100644
index 000000000..4c4e64fd6
--- /dev/null
+++ b/PKHeX.Core/Saves/Substructures/Time/Epoch0000DateTime.cs
@@ -0,0 +1,40 @@
+using System;
+using System.ComponentModel;
+
+namespace PKHeX.Core;
+
+[TypeConverter(typeof(ExpandableObjectConverter))]
+public sealed class Epoch0000DateTime(Memory<byte> Data): EpochDateTime(Data)
+{
+    // Data should be 4 or 8 bytes where we only care about the first 4 bytes i.e. 32  bits
+    // First 12 bits are year from 0000, next 4 bits are month, next 5 are days, next 5 are hours, next 6 bits are minutes
+
+    private static DateTime Epoch => new(0, 1, 1);
+
+    public override int Year { get => (int)(RawDate & 0xFFF); set => RawDate = (RawDate & 0xFFFFF000) | (uint)(value); }
+    public override int Month { get => (int)((RawDate >> 12) & 0xF); set => RawDate = (RawDate & 0xFFFF0FFF) | (((uint)value & 0xF) << 12); }
+    
+    public override DateTime Timestamp
+    {
+        get => new(Year, Month, Day, Hour, Minute, 0);
+        set
+        {
+            Year = value.Year;
+            Month = value.Month;
+            Day = value.Day;
+            Hour = value.Hour;
+            Minute = value.Minute;
+        }
+    }
+
+    public override string DisplayValue => $"{Timestamp.Year:0000}-{Timestamp.Month:00}-{Timestamp.Day:00} {Timestamp.Hour:00}ː{Timestamp.Minute:00}ː{Timestamp.Second:00}"; // not :
+
+    /// <summary>
+    /// time_t
+    /// </summary>
+    public override ulong TotalSeconds
+    {
+        get => (ulong)(Timestamp - Epoch).TotalSeconds;
+        set => Timestamp = Epoch.AddSeconds(value);
+    }
+}
diff --git a/PKHeX.Core/Saves/Substructures/Time/Epoch1900DateTimeValue.cs b/PKHeX.Core/Saves/Substructures/Time/Epoch1900DateTimeValue.cs
index 565862627..993ff0f1f 100644
--- a/PKHeX.Core/Saves/Substructures/Time/Epoch1900DateTimeValue.cs
+++ b/PKHeX.Core/Saves/Substructures/Time/Epoch1900DateTimeValue.cs
@@ -8,22 +8,17 @@ namespace PKHeX.Core;
 /// Stores the <see cref="Timestamp"/> to indicate the seconds since 1900 that an event occurred.
 /// </summary>
 [TypeConverter(typeof(ExpandableObjectConverter))]
-public sealed class Epoch1900DateTimeValue(Memory<byte> Data)
+public sealed class Epoch1900DateTimeValue(Memory<byte> Data) : EpochDateTime(Data)
 {
     // Data should be 4 or 8 bytes where we only care about the first 4 or 4.5 bytes i.e. 32 or 36 bits
     // First 12 bits are year from 1900, next 4 bits are 0 indexed month, next 5 are days, next 5 are hours, next 6 bits are minutes, (optional) last 4 bits are seconds
-    private Span<byte> Span => Data.Span;
 
     public Epoch1900DateTimeValue(SCBlock block) : this(block.Data) { }
 
     private static DateTime Epoch => new(1900, 1, 1);
 
-    private uint RawDate { get => ReadUInt32LittleEndian(Span); set => WriteUInt32LittleEndian(Span, value); }
-    public int Year { get => (int)(RawDate & 0xFFF) + Epoch.Year; set => RawDate = (RawDate & 0xFFFFF000) | (uint)(value - Epoch.Year); }
-    public int Month { get => (int)((RawDate >> 12) & 0xF) + 1; set => RawDate = (RawDate & 0xFFFF0FFF) | (((uint)(value - 1) & 0xF) << 12); }
-    public int Day { get => (int)((RawDate >> 16) & 0x1F); set => RawDate = (RawDate & 0xFFE0FFFF) | (((uint)value & 0x1F) << 16); }
-    public int Hour { get => (int)((RawDate >> 21) & 0x1F); set => RawDate = (RawDate & 0xFC1FFFFF) | (((uint)value & 0x1F) << 21); }
-    public int Minute { get => (int)((RawDate >> 26) & 0x3F); set => RawDate = (RawDate & 0x03FFFFFF) | (((uint)value & 0x3F) << 26); }
+    public override int Year { get => (int)(RawDate & 0xFFF) + Epoch.Year; set => RawDate = (RawDate & 0xFFFFF000) | (uint)(value - Epoch.Year); }
+    public override int Month { get => (int)((RawDate >> 12) & 0xF) + 1; set => RawDate = (RawDate & 0xFFFF0FFF) | (((uint)(value - 1) & 0xF) << 12); }
     public bool HasSeconds => Span.Length > 4;
     public int Second {
         get => HasSeconds ? Span[4] : 0;
@@ -32,7 +27,7 @@ public sealed class Epoch1900DateTimeValue(Memory<byte> Data)
         }
     }
 
-    public DateTime Timestamp
+    public override DateTime Timestamp
     {
         get => new(Year, Month, Day, Hour, Minute, Second);
         set
@@ -46,12 +41,12 @@ public sealed class Epoch1900DateTimeValue(Memory<byte> Data)
         }
     }
 
-    public string DisplayValue => $"{Timestamp.Year:0000}-{Timestamp.Month:00}-{Timestamp.Day:00} {Timestamp.Hour:00}ː{Timestamp.Minute:00}" + (HasSeconds ? $"ː{Timestamp.Second:00}" : ""); // not : 
+    public override string DisplayValue => $"{Timestamp.Year:0000}-{Timestamp.Month:00}-{Timestamp.Day:00} {Timestamp.Hour:00}ː{Timestamp.Minute:00}" + (HasSeconds ? $"ː{Timestamp.Second:00}" : ""); // not :
 
     /// <summary>
     /// time_t (seconds since 1900 Epoch)
     /// </summary>
-    public ulong TotalSeconds
+    public override ulong TotalSeconds
     {
         get => (ulong)(Timestamp - Epoch).TotalSeconds;
         set => Timestamp = Epoch.AddSeconds(value);
diff --git a/PKHeX.Core/Saves/Substructures/Time/EpochDateTime.cs b/PKHeX.Core/Saves/Substructures/Time/EpochDateTime.cs
new file mode 100644
index 000000000..4037bff26
--- /dev/null
+++ b/PKHeX.Core/Saves/Substructures/Time/EpochDateTime.cs
@@ -0,0 +1,18 @@
+using System;
+using static System.Buffers.Binary.BinaryPrimitives;
+
+namespace PKHeX.Core;
+
+public abstract class EpochDateTime(Memory<byte> Data)
+{
+    protected Span<byte> Span => Data.Span;
+    protected uint RawDate { get => ReadUInt32LittleEndian(Span); set => WriteUInt32LittleEndian(Span, value); }
+    public abstract int Year { get; set;}
+    public abstract int Month { get; set;}
+    public int Day { get => (int)((RawDate >> 16) & 0x1F); set => RawDate = (RawDate & 0xFFE0FFFF) | (((uint)value & 0x1F) << 16); }
+    public int Hour { get => (int)((RawDate >> 21) & 0x1F); set => RawDate = (RawDate & 0xFC1FFFFF) | (((uint)value & 0x1F) << 21); }
+    public int Minute { get => (int)((RawDate >> 26) & 0x3F); set => RawDate = (RawDate & 0x03FFFFFF) | (((uint)value & 0x3F) << 26); }
+    public abstract DateTime Timestamp { get; set; }
+    public abstract string DisplayValue { get; }
+    public abstract ulong TotalSeconds { get; set; }
+}