HDFC Bank announces temporary unavailability of UPI systems on Saturday, July 13, 2024, from 3:00 am to 3:45 am and 9:30 am to 12:45 am for migrating its Core Banking System to a new platform. The move aims to enhance customer experience by improving performance, capacity, reliability, and scalability. The upgrade is scheduled on a bank holiday to reduce inconvenience, prompting customers to plan ahead for banking activities.