Hello,

Do check this :

- In that function first check the range calculation and Month transition logic.

- In the range calculation ensure the loop correctly defines the start and end of the month, accounting for edge cases in months with different lengths. And in month transition logic verify that the logic for handling month transitions (previous and next months) does not introduce duplicates.

- Please make sure that days are not being added twice, especially at the month boundaries.

->Please check with the below mentioned code :

List<CalendarDayStruct> getCalendarForMonth(DateTime inputDate) {

List<CalendarDayStruct> calendar = [];

DateTime firstOfMonth = DateTime(inputDate.year, inputDate.month, 1);

DateTime lastOfMonth = DateTime(inputDate.year, inputDate.month + 1, 0);

// Find the first Monday on or before the first of the month

DateTime startCalendar = firstOfMonth.subtract(Duration(days: firstOfMonth.weekday - 1));

// Find the last Sunday after the end of the month

DateTime endCalendar = lastOfMonth.add(Duration(days: 7 - lastOfMonth.weekday));

print(\"Start Calendar: $startCalendar\");

print(\"End Calendar: $endCalendar\");

// Populate the calendar

for (DateTime date = startCalendar; date.isBefore(endCalendar.add(Duration(days: 1))); date = date.add(Duration(days: 1))) {

bool isPreviousMonth = date.isBefore(firstOfMonth);

bool isNextMonth = date.isAfter(lastOfMonth);

print(\"Adding date: $date, isPreviousMonth: $isPreviousMonth, isNextMonth: $isNextMonth\");

CalendarDayStruct dayStruct = CalendarDayStruct(

calendarDate: date,

isPreviousMonth: isPreviousMonth,

isNextMonth: isNextMonth,

);

calendar.add(dayStruct);

}

return calendar;

}

Custom calendar has duplicate day in grid view