DateHelper

src/main/java/emu/grasscutter/game/GenshinPlayer.java

@@ -534,7 +534,7 @@ public class GenshinPlayer {
 		remainCalendar.setTime(moonCardStartTime);
 		remainCalendar.add(Calendar.DATE, moonCardDuration);
 		Date theLastDay = remainCalendar.getTime();
-		Date now = DateHelper.onlyYDM(new Date());
+		Date now = DateHelper.onlyYearMonthDay(new Date());
 		return (int) ((theLastDay.getTime() - now.getTime()) / (24 * 60 * 60 * 1000)); // By copilot 
 	}
 
@@ -547,7 +547,7 @@ public class GenshinPlayer {
 		if (!moonCard) {
 			moonCard = true;
 			Date now = new Date();
-			moonCardStartTime = DateHelper.onlyYDM(now);
+			moonCardStartTime = DateHelper.onlyYearMonthDay(now);
 			moonCardDuration = 30;
 		} else {
 			moonCardDuration += 30;
@@ -561,7 +561,7 @@ public class GenshinPlayer {
 		if (!moonCard) {
 			return;
 		}
-		Date now = DateHelper.onlyYDM(new Date());
+		Date now = DateHelper.onlyYearMonthDay(new Date());
 		if (moonCardGetTimes.contains(now)) {
 			return;
 		}

src/main/java/emu/grasscutter/server/packet/send/PacketCardProductRewardNotify.java

+package emu.grasscutter.server.packet.send;
+
+
+import emu.grasscutter.net.packet.GenshinPacket;
+import emu.grasscutter.net.packet.PacketOpcodes;
+import emu.grasscutter.net.proto.CardProductRewardNotifyOuterClass.CardProductRewardNotify;
+
+public class PacketCardProductRewardNotify extends GenshinPacket {
+
+    public PacketCardProductRewardNotify(int remainsDay) {
+        super(PacketOpcodes.CardProductRewardNotify);
+
+        CardProductRewardNotify proto = CardProductRewardNotify.newBuilder()
+                .setProductId("ys_chn_blessofmoon_tier5")
+                .setHcoin(90)
+                .setRemainDays(remainsDay)
+                .build();
+
+        // Hard code Product id keep cool 😎
+
+        this.setData(proto);
+    }
+
+}

src/main/java/emu/grasscutter/utils/DateHelper.java

@@ -4,7 +4,7 @@ import java.util.Date;
 import java.util.Calendar;
 
 public final class DateHelper {
-    public static Date onlyYDM(Date now) {
+    public static Date onlyYearMonthDay(Date now) {
         Calendar calendar = Calendar.getInstance();
 		calendar.setTime(now);
 		calendar.set(Calendar.HOUR_OF_DAY, 0);