Create a new conditional column with difference of dates

Hello everyone, 

I want to create a new conditional date :  i have a column XXX with date (with some empty fields) and i want to create a new column with conditions : 

• If the difference between column XXX and the day of today (30/05/2023 today, 31/05/2023 tomorrow etc) is between 0 and 60 days, so the output is "A" 
• If the difference between column XXX and the day of today (30/05/2023 today, 31/05/2023 tomorrow etc) is between 60 and 90 days, so the output is "B"
• If the difference between column XXX and the day of today (30/05/2023 today, 31/05/2023 tomorrow etc) is plus than 90 days, so the output is "C"

How can i create this column ?

Thank you very much 

Regards