@Ducati1098 from your post what I get is the following
(a) Arrived at a foreign country --- Jul/17/2018 ; returned to the USA 12/01/2020 ---- this would mean that your 12 month test periods ( for meeting the 330 days away out of 365 day year) are as follows---
1. 07/17/2018 till 07/16/2019 for excluding the 2018 foreign earned income;
2. 01/01/2019 till 12/31/2019 for excluding all of 2019 foreign earned income;
3. 11/29/2019 till 11/30/ 2020 for excluding all the foreign earned income till 11/30/2020
(b) arrived at a foreign country -- July 17th. 2018 ; returned to USA 03/31/2020 -- this would mean
4. same as above for 2018, 2019 .
5. test period of 01/01/2020 till 12/31/2020 for excluding all foreign income earned in 2020
6. test period of 03/31/2020 till 03/30/2021 for excluding all foreign earned income in 2021.
Does this answer your question?
stay safe
pk
