Paper/paper-server/patches/sources/net/minecraft/server/commands/CommandTime.patch

--- a/net/minecraft/server/commands/CommandTime.java
+++ b/net/minecraft/server/commands/CommandTime.java
@@ -9,6 +9,11 @@
 import net.minecraft.network.chat.IChatBaseComponent;
 import net.minecraft.server.level.WorldServer;
 
+// CraftBukkit start
+import org.bukkit.Bukkit;
+import org.bukkit.event.world.TimeSkipEvent;
+// CraftBukkit end
+
 public class CommandTime {
 
     public CommandTime() {}
@@ -49,12 +54,18 @@
     }
 
     public static int setTime(CommandListenerWrapper commandlistenerwrapper, int i) {
-        Iterator iterator = commandlistenerwrapper.getServer().getAllLevels().iterator();
+        Iterator iterator = com.google.common.collect.Iterators.singletonIterator(commandlistenerwrapper.getLevel()); // CraftBukkit - SPIGOT-6496: Only set the time for the world the command originates in
 
         while (iterator.hasNext()) {
             WorldServer worldserver = (WorldServer) iterator.next();
 
-            worldserver.setDayTime((long) i);
+            // CraftBukkit start
+            TimeSkipEvent event = new TimeSkipEvent(worldserver.getWorld(), TimeSkipEvent.SkipReason.COMMAND, i - worldserver.getDayTime());
+            Bukkit.getPluginManager().callEvent(event);
+            if (!event.isCancelled()) {
+                worldserver.setDayTime((long) worldserver.getDayTime() + event.getSkipAmount());
+            }
+            // CraftBukkit end
         }
 
         commandlistenerwrapper.getServer().forceTimeSynchronization();
@@ -65,12 +76,18 @@
     }
 
     public static int addTime(CommandListenerWrapper commandlistenerwrapper, int i) {
-        Iterator iterator = commandlistenerwrapper.getServer().getAllLevels().iterator();
+        Iterator iterator = com.google.common.collect.Iterators.singletonIterator(commandlistenerwrapper.getLevel()); // CraftBukkit - SPIGOT-6496: Only set the time for the world the command originates in
 
         while (iterator.hasNext()) {
             WorldServer worldserver = (WorldServer) iterator.next();
 
-            worldserver.setDayTime(worldserver.getDayTime() + (long) i);
+            // CraftBukkit start
+            TimeSkipEvent event = new TimeSkipEvent(worldserver.getWorld(), TimeSkipEvent.SkipReason.COMMAND, i);
+            Bukkit.getPluginManager().callEvent(event);
+            if (!event.isCancelled()) {
+                worldserver.setDayTime(worldserver.getDayTime() + event.getSkipAmount());
+            }
+            // CraftBukkit end
         }
 
         commandlistenerwrapper.getServer().forceTimeSynchronization();