I'm using the Leave Request app template. The OnSelect property of start date picker is:
//**** CALCULATION USED TO DETERMINE TOTAL WORK DAYS REQUESTED ****
If(LeaveStartDatePicker.SelectedDate <= LeaveEndDatePicker.SelectedDate,
Set(_inclusiveTotalDaysRequested, DateDiff(LeaveStartDatePicker.SelectedDate, LeaveEndDatePicker.SelectedDate, Days) + 1);
Set(_numFullWeeks, RoundDown(_inclusiveTotalDaysRequested / 7, 0));
Set(_numFullDaysPartialWeek, _inclusiveTotalDaysRequested - _numFullWeeks * 7);
Concurrent(Set(_startWeekday, Weekday(LeaveStartDatePicker.SelectedDate)), Set(_endWeekday, Weekday(LeaveEndDatePicker.SelectedDate)));
//calculates the number of business days in the partial week left over after whole weeks are subtracted out of total days requested
If(_numFullDaysPartialWeek = 6,
If(_startWeekday <= 2, Set(_numPartialWeekdays, 5), Set(_numPartialWeekdays, 4)
),
_numFullDaysPartialWeek = 5,
If(_startWeekday = 2, Set(_numPartialWeekdays, 5), _startWeekday = 1 || _startWeekday = 3 || _startWeekday = 4, Set(_numPartialWeekdays, 4), Set(_numPartialWeekdays, 3)
),
_numFullDaysPartialWeek = 4,
If(_startWeekday = 2 || _startWeekday = 3, Set(_numPartialWeekdays, 4), _startWeekday = 1 || _startWeekday = 4, Set(_numPartialWeekdays, 3), Set(_numPartialWeekdays, 2)
),
_numFullDaysPartialWeek = 3,
If(_startWeekday = 6 || _startWeekday = 7, Set(_numPartialWeekdays, 1), _startWeekday = 1 || _startWeekday = 5, Set(_numPartialWeekdays, 2), Set(_numPartialWeekdays, 3)
),
_numFullDaysPartialWeek = 2,
If(_startWeekday = 7, Set(_numPartialWeekdays, 0), _startWeekday = 1 || _startWeekday = 6, Set(_numPartialWeekdays, 1), Set(_numPartialWeekdays, 2)),
_numFullDaysPartialWeek = 1,
If(_startWeekday = 1 || _startWeekday = 7, Set(_numPartialWeekdays, 0), Set(_numPartialWeekdays, 1)
),
_numFullDaysPartialWeek = 0, Set(_numPartialWeekdays, 0)
);
Set(_workDaysInRequest, _numFullWeeks * 5 + _numPartialWeekdays);
Set(_holidaysInRequest, CountIf(Holidays, StartDate >= LeaveStartDatePicker.SelectedDate, StartDate <= LeaveEndDatePicker.SelectedDate));
Set(_requestedDays, _workDaysInRequest - _holidaysInRequest)
)
But the 'New balance' total is counting weekends as in this example:
New balance Text property is:
LookUp(RequesterBalanceCollection, type=_selectedLeaveType, balance) - _requestedDays
&
" days"
I also want to exclude holidays from list stored in the Excel data file.
What's happening here?

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