Because you have a different compounding period (daily) from cash flow intervals (deposits) the stock formulas don't fit your situation. But spreadsheets are ideal for solving this kind of problem. Set up a simple table with each row being a day, tracking the beginning value for that day (which equals the ending value of the previous day), adding any deposits plus interest, and calculating an ending balance for that day.
The table can look something like this (I've hidden rows in the middle so it could be posted here):
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The interest rate (I assumed you meant 3.9% per annum, but compounded daily on a 365-day year basis) is entered in E1.
The formula in E2, filled down:
=SUM(C2:D2)*E$1/365
The formula in F2, filled down:
=SUM(C2:E2)
The formula in C3 filled down:
=F2
Enter the $1000 deposits in the rows representing the last day of each month (if the deposits are at the beginning of the respective days; otherwise enter on the following day).
Row 367 is defined as a Footer Row so it can hold formulas that refer to the columns above.
In D367:
=SUM(D)
In E367:
=SUM(E)
In F367:
=SUM(D$367:E$367)
You should get results like those shown. By the end of 1 year you will have put $42,000 in, and earned $1,412.58 in interest if you started January 1 of a non-leap year. In finance there are endless small variations in possible assumptions that can yield slightly different results. But this approach should give you a good approximation.
SG