using System;

using System.Collections.Generic;

​

​

​

public class Program

{

​

    public static void Main(){

        var x = DateTime.Now.AddDays(-90);

        var y = x.AddDays(90);

        foreach(var d in EachDay(x,y))

          Console.WriteLine(d);

    }

    private static IEnumerable<DateTime> EachDay(DateTime from, DateTime thru)

{

    for (var day = thru.Date; day.Date >= from.Date; day = day.Subtract(TimeSpan.FromDays(1)))//day.AddDays(-1))

    {

        yield return day;

    }

}

}