using System;

using System.Collections.Generic;

using NCrontab.Advanced;

using NCrontab.Advanced.Enumerations;

using NCrontab.Advanced.Filters;

using NCrontab.Advanced.Interfaces;

using CronExpressionDescriptor;

using System.Linq;

​

public class Program

{

    private static DateTime _start = DateTime.Parse("2017-01-01"); 

    private static DateTime _end = DateTime.Parse("2017-12-31");

    public enum TimeScale

    {

        None = 0,

        Once =1,

        Daily =2,

        Weekly = 3,

        Monthly = 4,

        Hourly = 5      

    }

    // Monthly example

    public static void Main()

    {

        var cron = "0 1 * * 1,2";

        var cronInstance = CrontabSchedule.Parse(cron);

        Console.WriteLine("Cron String:  " + cron);

        Console.WriteLine("\r\n-------------------------------------------------------------------");

        Console.WriteLine(DetermineTimescale(cronInstance));    

        Console.WriteLine("\r\n-------------------------------------------------------------------");

        Console.WriteLine(ExpressionDescriptor.GetDescription(cron));

        Console.WriteLine("\r\n-------------------------------------------------------------------");

        PrintOccurances(cronInstance);  

    }

    public static void PrintOccurances(CrontabSchedule input)

    {

        var occurances = input.GetNextOccurrences(_start, _end);

        foreach (var occurance in occurances)

        {

                Console.WriteLine(occurance);

        }   

    }

    public static TimeScale DetermineTimescale(CrontabSchedule input)

    {

        var minutes = input.Filters[CrontabFieldKind.Minute][0].ToString();

        var hours = input.Filters[CrontabFieldKind.Hour][0].ToString();

        var daymonth = input.Filters[CrontabFieldKind.Day][0].ToString();

        var month = input.Filters[CrontabFieldKind.Month][0].ToString();

        var dayweek = input.Filters[CrontabFieldKind.DayOfWeek][0].ToString();

        TimeScale timeScale = 0;

        if (new [] {hours, daymonth, month, dayweek}.All(x => x == "*"))

        {

            timeScale = TimeScale.Hourly;

        }

        if (new [] {daymonth, month, dayweek}.All(x => x == "*") && hours != "*")

        {

            timeScale = TimeScale.Daily;

        }

        if (dayweek != "*")

        {

            timeScale = TimeScale.Weekly;   

        }

        if (daymonth != "*")

        {

            timeScale = TimeScale.Monthly;  

        }

        return timeScale;   

    }

}