function main() {
  // Set your timezone for accurate time-based adjustments 
  var timeZone = "America/Los_Angeles";  

  // Get the current hour in your specified timezone
  var currentHour = Utilities.formatDate(new Date(), "HH", timeZone);

  // Define your campaign name (replace with your actual campaign)
  var campaignName = "Campaign Name"; 

  // Get all the keywords in the specified campaign
  var keywordIterator = AdsApp.campaigns()
      .withCondition("Name = '" + campaignName + "'")
      .get()
      .keywords();

  while (keywordIterator.hasNext()) {
    var keyword = keywordIterator.next();

    // Example: Increase bids by 20% during peak hours (9 AM to 5 PM)
    if (currentHour >= 9 && currentHour <= 17) {
      keyword.setBidModifier(1.2);  // Increase bid by 20%
    } else {
      keyword.setBidModifier(1.0);  // Reset bid to normal
    }
  }
}