Abstract: A method of displaying time-dependent information is used to provide a time navigation window for aiding a user in selecting data to be displayed in a chart. A first sequence of first selectable time intervals and a second sequence of second selectable time intervals are displayed in a hierarchical arrangement in a viewport in the time navigation window. The first and second selectable time intervals have first and second time scales, respectively, and each have a respective selectable area for display. The time-dependent data is displayed in the time intervals or selectable areas thereof of at least one the first and second sequences. A user can select one or more of the time intervals for changing range of time for display of the data within the viewport or for changing a range of time for display of the data in an area outside the viewport.