diff --git a/src/main/java/io/ib67/sfcraft/module/randomevt/LongNightModule.java b/src/main/java/io/ib67/sfcraft/module/randomevt/LongNightModule.java
index 0220899..a3d4e8f 100644
--- a/src/main/java/io/ib67/sfcraft/module/randomevt/LongNightModule.java
+++ b/src/main/java/io/ib67/sfcraft/module/randomevt/LongNightModule.java
@@ -7,10 +7,13 @@ import io.ib67.sfcraft.callback.SFCallbacks;
 import io.ib67.sfcraft.module.randomevt.longnight.DawnAfterLongNightEvent;
 import io.ib67.sfcraft.module.randomevt.longnight.LongNightEvent;
 import io.ib67.sfcraft.registry.event.RandomEventRegistry;
+import net.fabricmc.fabric.api.entity.event.v1.ServerPlayerEvents;
+import net.fabricmc.fabric.api.event.player.UseItemCallback;
 import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.item.ItemStack;
+import net.minecraft.item.Items;
 import net.minecraft.text.Text;
-import net.minecraft.util.Colors;
-import net.minecraft.util.Unit;
+import net.minecraft.util.*;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.World;
 
@@ -28,6 +31,16 @@ public class LongNightModule extends ServerModule {
         registry.registerEvent(DawnAfterLongNightEvent::new, World.OVERWORLD
                 , world -> world.getTimeOfDay() % 22200 == 0); // At dawn
         SFCallbacks.PLAYER_SLEEP.register(this::onPlayerSleep);
+        UseItemCallback.EVENT.register(this::onUseClock);
+    }
+
+    private TypedActionResult<ItemStack> onUseClock(PlayerEntity player, World world, Hand hand) {
+        if (player.isSpectator()) return TypedActionResult.pass(ItemStack.EMPTY);
+        if (player.getStackInHand(hand).isOf(Items.CLOCK)) {
+            if (LongNightEvent.isRunning())
+                player.sendMessage(Text.literal("永夜还将持续约 " + LongNightEvent.getRemainingTicks() / 20 + " 秒。").withColor(Colors.LIGHT_GRAY));
+        }
+        return TypedActionResult.pass(ItemStack.EMPTY);
     }
 
     public Either<PlayerEntity.SleepFailureReason, Unit> onPlayerSleep(PlayerEntity player, BlockPos pos) {
diff --git a/src/main/java/io/ib67/sfcraft/module/randomevt/longnight/LongNightEvent.java b/src/main/java/io/ib67/sfcraft/module/randomevt/longnight/LongNightEvent.java
index 22e5049..145ed82 100644
--- a/src/main/java/io/ib67/sfcraft/module/randomevt/longnight/LongNightEvent.java
+++ b/src/main/java/io/ib67/sfcraft/module/randomevt/longnight/LongNightEvent.java
@@ -1,6 +1,7 @@
 package io.ib67.sfcraft.module.randomevt.longnight;
 
 import io.ib67.sfcraft.module.randomevt.RandomEvent;
+import lombok.Getter;
 import lombok.RequiredArgsConstructor;
 import net.minecraft.text.Text;
 import net.minecraft.util.Colors;
@@ -11,6 +12,8 @@ import net.minecraft.world.World;
 public class LongNightEvent extends RandomEvent {
     static boolean justExpirencedLongNight;
     static boolean isAtLongNight;
+    @Getter
+    private static int remainingTicks;
     private final World world;
     private boolean doDaylightCycle;
     private boolean doTraderSpawning;
@@ -24,17 +27,20 @@ public class LongNightEvent extends RandomEvent {
         this.doTraderSpawning = world.getGameRules().getBoolean(GameRules.DO_TRADER_SPAWNING);
         world.getGameRules().get(GameRules.DO_DAYLIGHT_CYCLE).set(false, world.getServer());
         world.getGameRules().get(GameRules.DO_TRADER_SPAWNING).set(false, world.getServer());
-        return world.random.nextBetween(8400, 2 * 8400);
+        remainingTicks = world.random.nextBetween(8400, 2 * 8400);
+        return remainingTicks;
     }
 
     @Override
     public void onUpdate(int ticks) {
+        remainingTicks--;
     }
 
     @Override
     public void end() {
         isAtLongNight = false;
         justExpirencedLongNight = true;
+        remainingTicks = 0;
         world.getGameRules().get(GameRules.DO_DAYLIGHT_CYCLE).set(doDaylightCycle, world.getServer());
         world.getGameRules().get(GameRules.DO_TRADER_SPAWNING).set(doTraderSpawning, world.getServer());
     }