I need an Excel Expert

Hi, i need a quick expert which he can do and explain how to, insert left of the final day, the last day of each month that the process passes through and also to calculate it's interest on that last day of every month. Example : if i take a loan from 01/15/2022 for 90 days, i need that it brings back 01/31/2022, 02/28/2022,03/31/2022, 04/15/2022. And the interest to pay down of each day. Thank you