import java.time.LocalDate
import java.time.DayOfWeek
object FridayThe13ths {
def findFridayThe13ths(startYear: Int, endYear: Int): Unit = {
for (year <- startYear to endYear) {
for (month <- 1 to 12) {
val date = LocalDate.of(year, month, 13)
if (date.getDayOfWeek == DayOfWeek.FRIDAY) {
println(f"Friday the 13th: $year-${month}%02d-13")
}
}
}
}
def main(args: Array[String]): Unit = {
findFridayThe13ths(2025, 2031)
}
}
/*
run:
Friday the 13th: 2025-06-13
Friday the 13th: 2026-02-13
Friday the 13th: 2026-03-13
Friday the 13th: 2026-11-13
Friday the 13th: 2027-08-13
Friday the 13th: 2028-10-13
Friday the 13th: 2029-04-13
Friday the 13th: 2029-07-13
Friday the 13th: 2030-09-13
Friday the 13th: 2030-12-13
Friday the 13th: 2031-06-13
*/
