Agreed!

There's already a check box that says "send later." How hard can it possibly be to expand on that so when  it's checked it offers a radio button to either a date/time picker... or... wait for it... Choosing the already populated invoice date! :p

I can't believe this is one of the top search results for this topic at nearly 3 years old and this seemingly simple and incredibly valuable feature has yet to be implemented. The proposed workaround is clunky at best and is as stated is just a workaround. Can we bring in the dev team finally and make this a reality sometime before we all die of old age?