This date range picker plugin for Twitter Bootstrap creates a dropdown menu from which a user can select a range of dates. It was created for the reporting UI at Improvely.
If invoked with no options, it will present two calendars to choose a start and end date from. Optionally, you can provide a list of date ranges the user can select from instead of choosing dates from the calendars. If attached to a text input, the selected dates will be inserted into the text box. Otherwise, you can provide a custom callback function to receive the selection.