GetPersianWeekStartAndEndDates returns wrong result for "Saturday"

[rabbal]

Summary of the issue

GetPersianWeekStartAndEndDates return previous week's start date instead of current week for Saturday. Offset calculation in GetPersianWeekStartAndEndDates should be changed like below:

var offset = -1 * (7 + ((dateTime.DayOfWeek - firstDayOfWeek) % 7));

To

var offset = -1 * ((7 + (dateTime.DayOfWeek - firstDayOfWeek)) % 7);

Example code/Steps to reproduce:

[TestMethod]
public void Test_GetPersianWeekStartAndEndDates_For_Dates_Works_Saturday()
{
    var persianCalendar = new PersianCalendar();
    var date = new DateTime(1398, 5, 12, persianCalendar);
    var persianWeek = date.GetPersianWeekStartAndEndDates();

    Assert.AreEqual(expected: new DateTime(1398, 5, 12, persianCalendar), actual: persianWeek.StartDate);
    Assert.AreEqual(expected: new DateTime(1398, 5, 18, 23, 59, 59, persianCalendar), actual: persianWeek.EndDate);
}

[VahidN]

Thank you. Fixed it via#ea26673

[lock]

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