Override ThreadChannel#getTimeCreated

src/main/java/net/dv8tion/jda/api/entities/ThreadChannel.java

@@ -473,6 +473,15 @@ default ThreadMember getOwnerThreadMember()
     @Nonnull
     AutoArchiveDuration getAutoArchiveDuration();
 
+    /**
+     * The timestamp when this thread was created.
+     * <br><b>This will only be valid for threads created after 2022-01-09.
+     * Otherwise, this will return the timestamp of creation based on the {@link #getIdLong() thread's id.}</b>
+     *
+     * @return The timestamp when this thread was created
+     */
+    @Nonnull
+    OffsetDateTime getTimeCreated();
 
     /**
      * The slowmode time of this thread. This determines the time each non-moderator must wait before sending another message.

src/main/java/net/dv8tion/jda/internal/entities/EntityBuilder.java

@@ -1187,6 +1187,7 @@ public ThreadChannel createThreadChannel(GuildImpl guild, DataObject json, long
                 .setArchived(threadMetadata.getBoolean("archived"))
                 .setInvitable(threadMetadata.getBoolean("invitable"))
                 .setArchiveTimestamp(Helpers.toTimestamp(threadMetadata.getString("archive_timestamp")))
+                .setCreationTimestamp(threadMetadata.isNull("create_timestamp") ? 0 : Helpers.toTimestamp(threadMetadata.getString("create_timestamp")))
                 .setAutoArchiveDuration(ThreadChannel.AutoArchiveDuration.fromKey(threadMetadata.getInt("auto_archive_duration")));
 
         //If the bot in the thread already, then create a thread member for the bot.

src/main/java/net/dv8tion/jda/internal/entities/ThreadChannelImpl.java

@@ -20,6 +20,7 @@
 import net.dv8tion.jda.api.entities.*;
 import net.dv8tion.jda.api.managers.channel.concrete.ThreadChannelManager;
 import net.dv8tion.jda.api.requests.RestAction;
+import net.dv8tion.jda.api.utils.TimeUtil;
 import net.dv8tion.jda.api.utils.cache.CacheView;
 import net.dv8tion.jda.api.utils.data.DataArray;
 import net.dv8tion.jda.api.utils.data.DataObject;
@@ -52,6 +53,7 @@ public class ThreadChannelImpl extends AbstractGuildChannelImpl<ThreadChannelImp
     private boolean invitable;
     private long parentChannelId;
     private long archiveTimestamp;
+    private long creationTimestamp;
     private long ownerId;
     private long latestMessageId;
     private int messageCount;
@@ -209,6 +211,13 @@ public AutoArchiveDuration getAutoArchiveDuration()
         return autoArchiveDuration;
     }
 
+    @Nonnull
+    @Override
+    public OffsetDateTime getTimeCreated()
+    {
+        return creationTimestamp == 0 ? TimeUtil.getTimeCreated(getIdLong()) : Helpers.toOffset(creationTimestamp);
+    }
+
     @Override
     public int getSlowmode()
     {
@@ -311,6 +320,12 @@ public ThreadChannelImpl setArchiveTimestamp(long archiveTimestamp)
         return this;
     }
 
+    public ThreadChannelImpl setCreationTimestamp(long creationTimestamp)
+    {
+        this.creationTimestamp = creationTimestamp;
+        return this;
+    }
+
     public ThreadChannelImpl setOwnerId(long ownerId)
     {
         this.ownerId = ownerId;