Good evening Excel Gurus

In a situation where I want to determine the number of vacation days an
employees would have...

In A1 I have the hire date
In B1 I want to determine the number of days of vacation the person may have
using the following conditions:
- From 0 to 6 months -- 0 Days
- From 6 months to less than 1 -- 5 days
- From 1 to Less than 5 -- 10 days
- From 5 to less than 12 -- 5 days
- From 12 to 20 -- 20 days

This situation is a challenge because in the cell B1
- I need to determine the number of year/months/days based on today's date
compared to the HIRE DATE in A1
- I need to have several "if" condition tested at the same time

Can someone help?

Thanks so much