I am using jQuery UI datepicker with the UI brightness theme in a
project and it can be used by end users along with Bootstrap 3 styles.
I noticed that when using the changeMonth or changeYear
options, the select dropdowns in the datepicker widget get a style
definition of "color:inherit" from the bootstrap sheet, so
it is rendered with white text on white background.
I had to add an explicit color setting to the .ui-datepicker
.ui-datepicker-title select elements. I do not expect that someone
goes through all the existing themes, checks them against Bootstrap 3
and add just a line of CSS. Just wanted to share this for anyone
having the same problem.