diff --git a/src/main/java/emu/grasscutter/game/GenshinPlayer.java b/src/main/java/emu/grasscutter/game/GenshinPlayer.java
index 44f960198..5a8b96748 100644
--- a/src/main/java/emu/grasscutter/game/GenshinPlayer.java
+++ b/src/main/java/emu/grasscutter/game/GenshinPlayer.java
@@ -18,6 +18,7 @@ import emu.grasscutter.game.friends.PlayerProfile;
 import emu.grasscutter.game.gacha.PlayerGachaInfo;
 import emu.grasscutter.game.inventory.GenshinItem;
 import emu.grasscutter.game.inventory.Inventory;
+import emu.grasscutter.game.player.PlayerBirthday;
 import emu.grasscutter.game.props.ActionReason;
 import emu.grasscutter.game.props.PlayerProperty;
 import emu.grasscutter.net.packet.GenshinPacket;
@@ -73,6 +74,7 @@ public class GenshinPlayer {
 	private int nameCardId = 210001;
 	private Position pos;
 	private Position rotation;
+	private PlayerBirthday birthday;
 	
 	private Map<Integer, Integer> properties;
 	private Set<Integer> nameCardList;
@@ -139,6 +141,8 @@ public class GenshinPlayer {
 		this.combatInvokeHandler = new InvokeHandler(PacketCombatInvocationsNotify.class);
 		this.abilityInvokeHandler = new InvokeHandler(PacketAbilityInvocationsNotify.class);
 		this.clientAbilityInitFinishHandler = new InvokeHandler(PacketClientAbilityInitFinishNotify.class);
+
+		this.birthday = new PlayerBirthday();
 	}
 	
 	// On player creation
@@ -150,6 +154,7 @@ public class GenshinPlayer {
 		this.nickname = "Traveler";
 		this.signature = "";
 		this.teamManager = new TeamManager(this);
+		this.birthday = new PlayerBirthday();
 		this.setProperty(PlayerProperty.PROP_PLAYER_LEVEL, 1);
 		this.setProperty(PlayerProperty.PROP_IS_SPRING_AUTO_USE, 1);
 		this.setProperty(PlayerProperty.PROP_SPRING_AUTO_USE_PERCENT, 50);
@@ -642,6 +647,15 @@ public class GenshinPlayer {
 		return onlineInfo.build();
 	}
 
+	public PlayerBirthday getBirthday(){
+		return this.birthday;
+	}
+
+	public void setBirthday(int d, int m) {
+		this.birthday = new PlayerBirthday(d, m);
+		this.updateProfile();
+	}
+
 	public SocialDetail.Builder getSocialDetail() {
 		SocialDetail.Builder social = SocialDetail.newBuilder()
 				.setUid(this.getUid())
@@ -649,7 +663,7 @@ public class GenshinPlayer {
 				.setNickname(this.getNickname())
 				.setSignature(this.getSignature())
 				.setLevel(this.getLevel())
-				.setBirthday(Birthday.newBuilder())
+				.setBirthday(this.getBirthday().getFilledProtoWhenNotEmpty())
 				.setWorldLevel(this.getWorldLevel())
 				.setUnk1(1)
 				.setUnk3(1)
diff --git a/src/main/java/emu/grasscutter/game/player/PlayerBirthday.java b/src/main/java/emu/grasscutter/game/player/PlayerBirthday.java
new file mode 100644
index 000000000..733f58ee5
--- /dev/null
+++ b/src/main/java/emu/grasscutter/game/player/PlayerBirthday.java
@@ -0,0 +1,68 @@
+package emu.grasscutter.game.player;
+
+import emu.grasscutter.net.proto.BirthdayOuterClass.Birthday;
+
+public class PlayerBirthday {
+    private int day;
+    private int month;
+
+    public PlayerBirthday(){
+        this.day = 0;
+        this.month = 0;
+    }
+
+    public PlayerBirthday(int day, int month){
+        this.day = day;
+        this.month = month;
+    }
+
+    public PlayerBirthday set(PlayerBirthday birth){
+        this.day = birth.day;
+        this.month = birth.month;
+
+        return this;
+    }
+
+    public PlayerBirthday set(int d, int m){
+        this.day = d;
+        this.month = m;
+
+        return this;
+    }
+
+    public PlayerBirthday setDay(int value){
+        this.day = value;
+        return this;
+    }
+
+    public PlayerBirthday setMonth(int value){
+        this.month = value;
+        return this;
+    }
+
+    public int getDay(){
+        return this.day;
+    }
+
+    public int getMonth(){
+        return this.month;
+    }
+
+    public Birthday toProto(){
+        return Birthday.newBuilder()
+                .setDay(this.getDay())
+                .setMonth(this.getMonth())
+                .build();
+    }
+
+    public Birthday.Builder getFilledProtoWhenNotEmpty(){
+        if(this.getDay() > 0)
+        {
+            return Birthday.newBuilder()
+                    .setDay(this.getDay())
+                    .setMonth(this.getMonth());
+        }
+
+        return Birthday.newBuilder();
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/emu/grasscutter/server/packet/recv/HandlerSetPlayerBirthdayReq.java b/src/main/java/emu/grasscutter/server/packet/recv/HandlerSetPlayerBirthdayReq.java
new file mode 100644
index 000000000..0edb08f73
--- /dev/null
+++ b/src/main/java/emu/grasscutter/server/packet/recv/HandlerSetPlayerBirthdayReq.java
@@ -0,0 +1,38 @@
+package emu.grasscutter.server.packet.recv;
+
+import emu.grasscutter.server.game.GameSession;
+import emu.grasscutter.server.packet.send.PacketGetPlayerSocialDetailRsp;
+import emu.grasscutter.server.packet.send.PacketSetPlayerBirthdayRsp;
+
+import emu.grasscutter.net.packet.Opcodes;
+import emu.grasscutter.net.packet.PacketOpcodes;
+import emu.grasscutter.net.packet.PacketHandler;
+
+import emu.grasscutter.net.proto.SocialDetailOuterClass.SocialDetail;
+import emu.grasscutter.net.proto.SetPlayerBirthdayReqOuterClass.SetPlayerBirthdayReq;
+
+import com.google.gson.Gson;
+
+@Opcodes(PacketOpcodes.SetPlayerBirthdayReq)
+public class HandlerSetPlayerBirthdayReq extends PacketHandler {
+	@Override
+	public void handle(GameSession session, byte[] header, byte[] payload) throws Exception {
+		SetPlayerBirthdayReq req = SetPlayerBirthdayReq.parseFrom(payload);
+
+		if(req.getBirth() != null && req.getBirth().getDay() > 0 && req.getBirth().getMonth() > 0)
+		{
+			int day = req.getBirth().getDay();
+			int month = req.getBirth().getMonth();
+
+			// Update birthday value
+			session.getPlayer().setBirthday(day, month);
+
+			// Save birthday month and day
+			session.getPlayer().save();
+			SocialDetail.Builder detail = session.getPlayer().getSocialDetail();
+
+			session.send(new PacketSetPlayerBirthdayRsp(session.getPlayer()));
+			session.send(new PacketGetPlayerSocialDetailRsp(detail));
+		}
+	}
+}
diff --git a/src/main/java/emu/grasscutter/server/packet/send/PacketSetPlayerBirthdayRsp.java b/src/main/java/emu/grasscutter/server/packet/send/PacketSetPlayerBirthdayRsp.java
new file mode 100644
index 000000000..acca25068
--- /dev/null
+++ b/src/main/java/emu/grasscutter/server/packet/send/PacketSetPlayerBirthdayRsp.java
@@ -0,0 +1,22 @@
+package emu.grasscutter.server.packet.send;
+
+import emu.grasscutter.Grasscutter;
+import emu.grasscutter.game.GenshinPlayer;
+import emu.grasscutter.net.packet.GenshinPacket;
+import emu.grasscutter.net.packet.PacketOpcodes;
+import emu.grasscutter.net.proto.SetPlayerBirthdayRspOuterClass.SetPlayerBirthdayRsp;
+import emu.grasscutter.net.proto.BirthdayOuterClass.Birthday;
+
+public class PacketSetPlayerBirthdayRsp extends GenshinPacket {
+    public PacketSetPlayerBirthdayRsp(GenshinPlayer player) {
+        super(PacketOpcodes.SetPlayerBirthdayRsp);
+
+        SetPlayerBirthdayRsp proto = SetPlayerBirthdayRsp.newBuilder()
+                .setBirth(player.getBirthday().toProto())
+                .build();
+
+        this.setData(proto);
+
+        if(Grasscutter.getConfig().DebugMode == true) Grasscutter.getLogger().info("Sending packet");
+    }
+}