How can I add working days to a specific date (Flutter)? - flutter

Question

I want to add the calulated working days to a specific date.
For example
I want to add 14 working days
date -> 08.17.2022 (it is input)
newDate -> 09.06.20222 (it is output)
I tried it with the code below but it didn't work as I want. What is my wrong? How can I do that?
Thanks in advance.
final workingDays = <DateTime>[];
final currentDate = DateTime.fromMicrosecondsSinceEpoch(
widget.siparisModel.siparisTarih.microsecondsSinceEpoch);
final orderDate = currentDate.add(Duration(days: 15));
DateTime indexDate = currentDate;
while (indexDate.difference(orderDate).inDays != 0) {
final isWeekendDay = indexDate.weekday == DateTime.saturday || indexDate.weekday == DateTime.sunday;
if (!isWeekendDay) {
workingDays.add(indexDate);
}
indexDate = indexDate.add(Duration(days: 15));
}

Answer 1

You could do something like this:
var newDate = DateTime(2022, 08, 17); // Copy from some "currentDate"
var numOfWeekdaysToAdd = 14;
while (numOfWeekdaysToAdd > 0) {
do {
newDate = newDate.add(Duration(days: 1));
} while (newDate.weekday == DateTime.saturday || newDate.weekday == DateTime.sunday);
numOfWeekdaysToAdd--;
}
Working DartPad demo:
https://dartpad.dev/?id=6ef6f4306944b350edfb77905239297e
If you want to, you could extend the "weekend-check" and make it more complex to also check for holidays in a specific locale. In that case I'd have a list of holiday-dates, and just add something like holidayDates.contains(newDate)