private void YesterdayRadioButton_CheckedChanged(object sender, System.EventArgs e) { MOG_Time start = new MOG_Time(); start.SubtractDay(1); this.ListStartDateTimePicker.Value = new DateTime(start.mYear, start.mMonth, start.mDay, 0, 0, 0, 0); this.ListEndDateTimePicker.Value = new DateTime(start.mYear, start.mMonth, start.mDay, 23, 59, 59, 59); }