The Apple phone cannot save the schedule and the calendar has not been set.

Can be set.

In day view, tap the Add button at the top of the screen. Enter a title for the event. Tap Location or Video Call, then enter your actual location or tap FaceTime to enter a video link to the remote schedule. You can also copy a FaceTime link you created or received and paste it into the Location field, see Create a FaceTime link on iPhone. Enter the schedule's start and end times, travel times, invitees, attachments, and more. (If necessary, swipe up to enter all meeting information.) Tap Add.

You can also download third-party software to help set the schedule more conveniently.