Here are some of the options you can provide to the tm1-ui-dbr when using datepicker:
To add a ‘Clear’ button so that you can clear the date if needed and make it empty again, add clearBtn:true. Your option will now look like: tm1-date-option=“{format:‘yyyy-mm-dd’, clearBtn:true}”. You will now have the following button visible:
You are better off creating a user preferences cube in tm1 that holds Canvas selections for your title drop downs and using a tm1-ui-dbr - that way you can store the selections and use the bootstrap datepicker.
If you create pick lists for the cells of your cube, you are basically creating a stored subnm with the added features of the tmi-ui-dbr directive.