nextDay method
Returns the next day.
This method calculates the day after the current DateTime object.
It handles month and year changes correctly.
startOfDay if true, returns the next day at 00:00:00.
Implementation
DateTime nextDay({bool startOfDay = true}) {
DateTime result = add(const Duration(days: 1));
if (startOfDay) {
result = DateTime(result.year, result.month, result.day);
}
return result;
}