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