import java.time.LocalDate
import java.time.DayOfWeek
fun findFridayThe13ths(startYear: Int, endYear: Int) {
for (year in startYear..endYear) {
for (month in 1..12) {
val date = LocalDate.of(year, month, 13)
if (date.dayOfWeek == DayOfWeek.FRIDAY) {
println("Friday the 13th: $year-${month.toString().padStart(2, '0')}-13")
}
}
}
}
fun main() {
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
*/
