BeerTime

using System;
using System.Globalization;
namespace _10_BeerTime
{
    class BeerTime
    {
        static void Main()
        {
            string pattern = "hh:mm tt";
            string startBeer = "01:00 PM";
            DateTime startBeerTime = DateTime.ParseExact(startBeer, pattern, CultureInfo.InvariantCulture);
            string endBeer = "03:00 AM";
            DateTime endBeerTime = DateTime.ParseExact(endBeer, pattern, CultureInfo.InvariantCulture);

            DateTime inputTime = DateTime.Now;
            Console.Write("Enter time in format \"hh:mm tt\": ");
            string input = Console.ReadLine();
            bool isValid = DateTime.TryParseExact(input, pattern, CultureInfo.InvariantCulture, DateTimeStyles.None, out inputTime);
            while (!isValid)
            {
                Console.Write("Invalid time. Please enter new time in format \"hh:mm tt\": ");
                input = Console.ReadLine();
                isValid = DateTime.TryParseExact(input, pattern, CultureInfo.InvariantCulture, DateTimeStyles.None, out inputTime);
            }

            if (inputTime>=startBeerTime || inputTime<endBeerTime)
            {
                Console.WriteLine("beer time");
            }
            else
            {
                Console.WriteLine("non-beer time");
            }


        }
    }
}