Get start and end dates of a week in c#

StartAndEndOfWeek.cs

public static DateTime[] GetStartAndEndDatesOfCurrentWeek(int weekNum = 0)
        {
            var currentDate = DateTime.Now.Date.AddDays(weekNum * 7);
            var dayOfWeekForcurrentDate = (int)currentDate.DayOfWeek;
            var startDateOfWeek = currentDate.Date.AddDays(dayOfWeekForcurrentDate - 6);
            var endDateOfWeek = currentDate.Date.AddDays(6 - dayOfWeekForcurrentDate);
            return new[] { startDateOfWeek.Date , endDateOfWeek.Date };
        }
    }
//  how to call method

// for current week
var daysArray = GetStartAndEndDatesOfCurrentWeek();
//for next week
var daysArray = GetStartAndEndDatesOfCurrentWeek(1);
//for last week
var daysArray = GetStartAndEndDatesOfCurrentWeek(-1);