MorningTube is simple app that plays YouTube video at the scheduled time. For setting a time and video, tap 'search video' button . Then you'll see search video screen. Type the keyword and tap search button, then result movies will be listed. Tap the thumbnail, then you go main screen. After that you tap time indicater displayed at center of the screen. Select time and tap ' Timer' button. You will see the video at the scheduled time automatically.
changing target time during timer is running is abled