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Using sliders to change hours, minutes and seconds is cumbersome to many users. Especially entering "clean" times like 09:15:00 is a pain, as the sliders are pretty short.
This pull request adds dropdown menus to the hours, minutes and seconds values. The "hours" dropdown menu has submenus for each hour with 00:00, 15:00, 30:00 and 45:00 settings for minutes and seconds. This makes it easy to select clean time slots. The dropdown menus for minutes and seconds menus have their values in 5 minutes/seconds steps, with a submenu to select the values in between.
To minimize the required mouse interaction, the dropdowns and submenus open on mouse over (hover). The min/max values for hours, minutes and seconds are respected.
PS: Also includes a trivial fix for the spacing between the minutes and seconds slider.
See it in action, using the

visual-tests.html
file: