Question about stock splits

[NikkiB 22]

Ok, I've been Googling for hours - so for the Tesla and Apple stock splits coming up...we'll use Tesla as the example as it'll apply to both.  It says each stockholder of record on August 21 receives the additional shares after close on August 28.  What happens if you buy Tesla stock between those dates, like on August 23rd...or 24th?  This question does not pertain to day trading the stock those days - in all honestly, I'm in the middle of an IRA rollover and am trying to figure out it my money rolls over/invests during the week of August 23rd - how do the shares I have of Apple and Tesla work?  I'm hoping since I day trade with you all every day that someone can help me out with this question cuz I've been Googling for hours and can't figure it out - and will hold the IRA rollover check for investing until August 31st if somehow buying those two stocks in my mutual funds the week of August 23rd messes me up.  Thanks to anyone who can shed some light on this for me 🙂