using System;

public class Program

{

    public static void Main()

    {

         var cronExpression = Cronos.CronExpression.Parse("0 0 31 * *");

        var dateTimes = cronExpression.GetOccurrences(DateTime.UtcNow, DateTime.UtcNow.AddYears(1));

        foreach (var dt in dateTimes)

        {

            Console.WriteLine(dt.ToString("g"));    

        }

    }

}