@Hasan Çakır Hello! I'm glad you reached out. If there was an update to the API that changed the date format, it should have been communicated in the update notes or changelog. Let me check if there's any information available on this. Please hold on for a moment. [Checking for updates or changelog...] Unfortunately, I don't have direct access to the update logs or changelogs. I recommend checking the official VAPI documentation or the developer portal where such updates are usually posted. If you can't find the information there, please reach out to support for more detailed information on this change.