set z index of rangepicker to a higher number, so as to be above eg bootstrap-modal

currently, when the daterange picker is placed in a modal which uses a z-index, the range picker is behind the modal.
for example:
http://i.imgur.com/gOicNHt.png

in this instance, i was using bootstrap-modal which has a z-index of 1050.

when making the z-index 3000, i was then able to see the dropdown:
http://i.imgur.com/X7do1iT.png