SilverStripe has powerful classes to manage date times. SS_Datetime gives a lot of features. But SilverStripe DateTimeField which returns a composite of the Date field and the time field just returns a text field as the time field. We wanted to take this forward and to use HTML 5 Calendar fields and the Time field for SilverStripe.
We made three fields one is an HTML5 time field, and one is a time dropdown field where you can specify the start time, the end time and the interval in minutes, and a HTML5 date field.
Check our git repos, and use composer to install for your website.