Ability to update after (start) and before (end) times

I would like to have the ability to change the after and before dates for a time of day helper.

My use case for this is I’m tracking peak electricity rates. It’s fairly common between 16:00-19:00 to be at the peak rates due to the time of the day. From what I have seen. this can vary +/- 1 hour either side. This is easier to setup than creating a template to calculate this.