Fix datetimepicker to choose from 24hr (okpy#1326)

Author: itsnshaw

server/static/js/main.js

@@ -52,5 +52,5 @@ function debounce(func, wait, immediate) {
 };
 
 $('.datetime-picker').datetimepicker({
-  format: 'YYYY-MM-DD hh:mm:ss'
+  format: 'YYYY-MM-DD HH:mm:ss'
 });