Redmine

Same problem in Chrome Version 52.0.2743.116 (64-bit)

Redmine version                3.3.0.stable.15748
  Ruby version                   2.3.0-p0 (2015-12-25) [x86_64-linux]
  Rails version                  4.2.7.1
  Environment                    production
  Database adapter               Mysql2

Ok on Firefox 48

with redmine 3.3.0 stable and FF 48 on Linux and windows, it doesn't work. Also with IE 11 it doesn't work.

for better understanding: the date picker at the issues are not displayed, the date picker at log time works fine

  Redmine version                3.3.0.stable
  Ruby version                   2.3.1-p112 (2016-04-26) [x86_64-linux-gnu]
  Rails version                  4.2.6
  Environment                    production
  Database adapter               Mysql2

Clear cache and cookies. Then it start to work but probably by using native browser's date picker.