Abstract: An event timer having an adaptable interval for potty training for children is presented, comprising an adaptable timer for cumulatively adapting timing intervals to the needs of a particular child in response to input of potty training events. The event timer includes an input with buttons for providing user input to the adaptable timer indicating the occurrence of a potty training event. An output is connected with the adaptable timer for signaling the expiration of a timing interval, whereby the user input is used by the timer to adjust timing intervals based on the frequency of the occurrence of the event to more closely approximate the frequency of the occurrence of the event. The event timer is preferably in the form of a watch. A time period is divided into partitions, which serve as bins for cumulatively averaging the occurrence of timing events to develop timing intervals.