Dim startDay As Date = Now
Dim endDay As Date = Now.AddDays(4).ToShortDateString
Dim dayCtr As Date
dayCtr = startDay
While (dayCtr <= endDay)
MessageBox.Show(dayCtr.ToShortDateString)
'เฉพาะวันที่ dayCtr.ToString("dd")
dayCtr = dayCtr.AddDays(1)
End While