Instead of doing exactly that - leaving it as a draft and then trying to remember to send it at a specific time - just use Boomerang.
Kama ime kpọmkwem nke ahụ - ịhapụ ya dị ka onye na-edegharị ma na-agbalị icheta iji zipụ ya n'oge ụfọdụ - jiri Boomerang mee ihe.