Below is my own experience.

if appear in 1 Feb 2020 whole Feb enjoy the monthly interest.
if appear in 31 Jan 2020 lose 1 day interest, but after this Feb and all month enjoy interest.
if appear in 2 Feb 2020 lose whole Feb month interest, but after this, Mac and all month enjoy interest.

- self contribution via bank on 1/3/2018.  appear in EPF account in 2/3/2018.  Dividend for Mar2018 till Dec2018.  This year will try bank in say 27/28 of the month, to try out the dividend calculation.
2.)If every month no top up, but have balance in EPF, this is not complicated counting and use the calculation(Base on counting others, the counting more complicated than above EPF, the results can call very absolutely not wrong count, even of 1 cent), but why use the same counting, the results of above EPF each account can less RM 0.02.
You self do a counting?

- yes, I do my own calculation. if total  +/- 5 sen, I take it correct.  unless you manual key in after the calculation like rm123.456, you re-key into the worksheet as rm123.46.  then, it should be okay.

As stated above, if bank in (cleared) into EPF on 1-Nov, then interest pro-rated for Nov & Dec (2/12 x % x amount)

If after 1-Nov, then interest pro-rated for Dec (1/12 x % x amount) only.