Conditional-Statements-Problem-10

using System;

class BeerTime
{
    static void Main()
    {
        Console.Write("Enter time [hh:mm tt]: ");
        string beerTime = Console.ReadLine();

        char firstNumeral = beerTime[0];
        char secondNumeral = beerTime[1];
        string fakeHour = Convert.ToString(firstNumeral) + Convert.ToString(secondNumeral);
        int hour = Convert.ToInt32(fakeHour);
        Console.WriteLine(hour);

        firstNumeral = beerTime[3];
        secondNumeral = beerTime[4];
        string fakeMinute = Convert.ToString(firstNumeral) + Convert.ToString(secondNumeral);
        int minute = Convert.ToInt32(fakeMinute);
        Console.WriteLine(minute);

        firstNumeral = beerTime[6];
        secondNumeral = beerTime[7];
        string sign = Convert.ToString(firstNumeral) + Convert.ToString(secondNumeral);
        Console.WriteLine(sign);

        //check for invalid time
        bool isValidSign = false;
        if ((sign == "AM") || (sign == "PM"))
        {
            isValidSign = true;
        }


        if ((hour < 1) || (hour > 12) || (minute < 0) || (minute > 59) || (isValidSign == false))
        {
            Console.WriteLine("invalid time");
        }
        else
        {
            // check if AM or PM
            if (sign == "PM")
            {
                hour = hour + 12;
            }

            if ((isValidSign==true) && ((hour < 3) || (hour >= 13)))
            {
                Console.WriteLine("beer time!");
            }
            else
            {
                Console.WriteLine("non-beer time :(");
            }

        }
    }
}