The present disclosure generally relates to methods and user interfaces for providing clock user interfaces. In some embodiments, methods and user interfaces for providing clock user interfaces displaying simulated emitted light, methods and user interfaces for displaying clock user interfaces including astronomical object, methods and user interfaces for displaying clock user interfaces that include adjustable time indications, methods and user interfaces for displaying clock user interfaces that include multiple calendar systems, methods and user interfaces for displaying clock user interfaces including animated numerals, methods and user interfaces for displaying clock user interfaces with colors that are based on a selected color, and/or methods and user interfaces for displaying clock user interfaces including animated lines are described.