Time field - need FEWER options

For Date/Time Fields, I see that the list of times to choose from starts from midnight to midnight in 15 min increments...

I propose the following features and fixes:

  1. Ability to remove the 15-min increments. Given that exact times can be keyed in, all we need is half-hour increments in the drop-down
  2. Make it possible to limit the start & end times offered - most applications only need times to be available during business hours, for example to the drop-down can be greatly simplified if we can set a start and end time.