Determine if a string of format "hh:mm" is valid date

I’m learning C# and I’m taking an Udemy course. There is this exercise:

Given an user input of the following form hh:mm, determine it’s a valid date.
19:20 or 01:20 are valid inputs, but 24:01 is not.

I implemented it by working on chars but I believe I’m complicating myself. Is there an alternative(besides regex) ? (maybe using some .net builtins(DateTime/Timespan)

        Console.Write("Enter a time value(ex: 19:20): ");
        var result = "Valid time";
        var input = Console.ReadLine();
        if (String.IsNullOrEmpty(input)) {
            Console.WriteLine("Invalid time");
            Environment.Exit(-1);
        }
        var dates = input.Split(":");

        //validate hour
        var firstDigitHour = (int)char.GetNumericValue(dates[0][0]);
        var secondDigitHour = (int)char.GetNumericValue(dates[0][1]);
        var hour = 10 * firstDigitHour + secondDigitHour;
        if (hour > 23) {
            result = "Invalid time";
        }

        //validate minutes
        var firstDigitMinute = (int)char.GetNumericValue(dates[1][0]);
        var secondDigitMinute = (int)char.GetNumericValue(dates[1][1]);
        var minutes = 10 * firstDigitMinute + secondDigitMinute;
        if (minutes > 59 ) {
            result = "Invalid time";
        }


        Console.WriteLine(result);

>Solution :

You can do something like this:

public static bool IsValidTimeFormat(string input)
{
    TimeSpan dummyOutput;
    return TimeSpan.TryParse(input, out dummyOutput);
}

And try out:

string yourString = "19:20";
string yourString2 = "24:48";
Console.WriteLine(IsValidTimeFormat(yourString).ToString()); //will print True
Console.WriteLine(IsValidTimeFormat(yourString2).ToString()); //will print False