import java.time.LocalDate
import java.time.DayOfWeek
import java.time.format.DateTimeFormatter
// Return all last Sundays of each month in a given year
fun lastSundaysOfYear(year: Int) = sequence {
for (month in 1..12) {
// Last day of the month
var date = LocalDate.of(year, month, 1)
.plusMonths(1)
.minusDays(1)
// Walk backward to Sunday
while (date.dayOfWeek != DayOfWeek.SUNDAY) {
date = date.minusDays(1)
}
yield(date)
}
}
fun main(args: Array<String>) {
val year: Int =
if (args.isNotEmpty())
args[0].toInt()
else
2026
val fmt = DateTimeFormatter.ofPattern("MM/dd/yyyy")
for (date in lastSundaysOfYear(year)) {
println(date.format(fmt))
}
}
/*
run:
01/25/2026
02/22/2026
03/29/2026
04/26/2026
05/31/2026
06/28/2026
07/26/2026
08/30/2026
09/27/2026
10/25/2026
11/29/2026
12/27/2026
*/
