Custom Date Picker
You can change date picker for fields of “Date/Time” type. Default SharePoint date picker works in Internet Explorer and may not work in other ones. It looks as follows:
You can change its view for date/time fields in your list, for example, if you need to work in Mozilla Firefox.
Go to Virto Form Extender Settings of a required list and add new settings.
Check the box “Use custom date picker” opposite “Date typed field settings” note, click “Save”.
Now when you apply these settings to forms of your SharePoint list, users will see another date picker while working with this field (see the screenshot below).