How do I manipulate with the weeks?

[HanneSThEGreaT]

If I understand you correctly, you want to determine Monday and / or Thursday ....

If that's the case, you can use the WeekDay function like this :

Dim MyWeekDay As Integer 'get the week day number

MyWeekDay = Weekday(DateTime.Today) 'get the current weekday
MessageBox.Show(MyWeekDay.ToString())

Important thing to note here, is that if your firstday of the week is Sunday, it will return 2 for Monday and 5 for Thursday. If your first day of the week is set to Monday, then of course it will return 1 for Monday, and 4 for Thursday.

Does this help ¿