LocalDate constructor
Creates a new LocalDate instance for a specific year, month, and day.
Throws InvalidArgumentException if the date is not valid (e.g. April 31).
Example:
final d = LocalDate(2023, 2, 28);
Represents a calendar date without time or timezone.
This class provides date-only operations such as computing weekdays, adding or subtracting days/months/years, and converting from/to strings.
It ensures valid dates (e.g. February never has more than 29 days).
Example
final date = LocalDate(2024, 6, 27);
print(date); // "2024-06-27"
Implementation
LocalDate(this.year, this.month, this.day) {
_validateDate(year, month, day);
}