The step property specified in seconds affects the resolution of the time picker and visibility of the time picker dropdown. If step is less than 15 minutes (<900) the dropdown is hidden.
The min and max properties affect the range of dates and times that will be available in the picker.
Note: The date time picker has a non-empty value only when both a date and a time have been selected.
Dropdown is only opened when clicking the toggle button or pressing Up or Down arrow keys.