Linq. How to select records falling within a given date range?

Question

LINQ

There is a table, it has two fields with dates: StartDate (StartDate) and EndDate (EndDate)
I need to write a query that displays all records that meet the condition:
If EndDate - StartDate = 3 months, then display the record.
Please help me make a request, I can't figure it out.
Thank you!

Answer 1

Understood, there will be something like
(a.EndDate.Value - a.StartDate).TotalDays < 90