import java.time.LocalDate
import java.time.format.DateTimeFormatter
object DateAdditionExample {
/** Adds a specified number of weeks to a given LocalDate.
*
* @param baseDate The original LocalDate.
* @param weeks The number of weeks to add (can also be negative to subtract).
* @return A new LocalDate with the added weeks.
*/
def addWeeksToDate(baseDate: LocalDate, weeks: Int): LocalDate = {
require(baseDate != null, "Base date cannot be null.")
// plusWeeks() safely manages month and year boundaries, plus leap years.
baseDate.plusWeeks(weeks)
}
def main(args: Array[String]): Unit = {
// Initialize a sample date: November 8, 2026
val targetDate = LocalDate.of(2026, 11, 8)
val weeksToAdd = 4
// Perform the addition
val resultDate = addWeeksToDate(targetDate, weeksToAdd)
// Format and display the results
val formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd")
println(s"Original date: ${targetDate.format(formatter)}")
println(s"After adding $weeksToAdd weeks: ${resultDate.format(formatter)}")
}
}
/*
run:
Original date: 2026-11-08
After adding 4 weeks: 2026-12-06
*/
