Ask hhmm after dd/mm/yy for deadline

[ttippinyu]

So if there is an error to date input eg. 1/1/2019 it will output

 Please enter date in the format dd/mm/yyyy.

Then when I add in a date that works eg. 23/11/2019 it will output

 Please enter dates in the format dd/mm/yyyy hhmm

This seems redundant.