using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(GetLastWeeksEndDate(DateTime.Now, "ES011010").AddDays(1));

    }

    public static DateTime GetLastWeeksEndDate(DateTime currentDate, string coddiv)

    {

        int dayOffset;

​

        //Number Monday 1 to Sunday 7

        int dayNumber = currentDate.DayOfWeek == DayOfWeek.Sunday ? 7 : (int)currentDate.DayOfWeek;

​

        //Config Parameter LE_WEEK_FIRST_DAY contains first week day by Division 1 for Monday until 7 for Saturday

        // int weekStartDayNumber = int.Parse(XApp.DbConfigs.GetParameter(coddiv, "LE_WEEK_FIRST_DAY", "1")); --> in ES011010 case this parameter is not present in T010 so default value will be taken (1) 

        int weekStartDayNumber = 1;

​

        //ie: weekStartDayNumber Monday (1), dayNumber Sunday (7), returns 1 - 7 - 1 = -7 (Previous Sunday)

        //    weekStartDayNumber Monday (1), dayNumber Wedne. (3), returns 1 - 3 - 1 = -3 (Previous Sunday)

        //    weekStartDayNumber Satur. (6), dayNumber Sunday (7), returns 6 - 7 - 1 = -2 (Previous Friday)

        //    weekStartDayNumber Satur. (6), dayNumber Wedne. (7), returns 6 - 3 - 8 = -5 (Previous Friday)

        dayOffset = weekStartDayNumber - dayNumber - (dayNumber >= weekStartDayNumber ? 1 : 8);

​

        return currentDate.AddDays(dayOffset).Date;

    }

}