Steps to reproduce the issue

@ditsuke

Create a new scheduled task

select execution rule = Cron Expression

Expected result

Select: 0 0 1 January Monday

click save

Actual result

Im unable to get ANY cron expression to save.

Also

Well firstly if select "Cron Expression (Advanced)" I expect to enter my cron syntax in myself, manually, like the expert I am.

I want a text box I can past in my cron expression like...
*/15 * * * *

Secondly - I note that the select boxes have the wrong integers? Monday in cron is 1 whereas in the select box its 0 is this being taken into account?