I'm new to symfony and would like to create a custom datetime control and am currently struggling with the twig template as the datetime control seems to be a compound of the date and time control and all my attempts to create a new one fail.
The control should look like this:

A separate datepicker and a separate time picker which shows a dropdown list of times according to step setting (not a separate dropdown for hour and minute).
I tried with creating an AbstractType but failed to get the data correctly mapped into it.
What's the best way to create this control without affecting the normal DateTimeType rendering (should be separate) and without affecting DateType and TimeType either?