Systems, methods, and non-transitory computer-readable storage mediums storing at least one program for identifying an end of a television program is described. In some implementations, a method comprises: periodically obtaining subtitles for a plurality of television programs during respective predetermined time intervals that include respective times when respective television programs in the plurality of television programs are scheduled to end; identifying sequences of strings from the subtitles for the plurality of television programs in accordance with predefined criteria associated with the plurality of television programs; and updating an aggregation of subtitles indicating that a television program in the plurality of television program has ended, with the identified sequences of strings. In some implementations, the method is implemented at a computing device having at least one processor and memory storing at least one program for execution by the at least one processor.