.setTimestamp is not a function

client.on("messageCreate", (message) => {
    if (message.content.startsWith("ping")) {
    const exampleEmbed = new EmbedBuilder()
      .setColor('#2ecc71') // lime green
      .setTitle('General Rules')
      .setDescription([
      'These rules are in effect in the entire server, regardless of the channel.',
      'Breaking these rules will be met with punishments from Moderators & Administators.',
      'You are expected to follow these.',
      '

' 
      .setTimestamp()
      ].join('\n'));

        message.channel.send({ embeds: [exampleEmbed] });
      }
    });