A possible workaround you could create a date/time hierarchy based on your date dimension/field. You can then add input controls for Year, Quarter, Month, Day on your page in the compose tab. Each input control will allow you to select multiple options.
As an example, if you want the charts on your page to show values for the date range 'Jan 1st 2009' to 'June 30th 2009', you can set Input Control Year=2009 and Input Control Quarter=Q1,Q2