Answer by user2023861 for Converting a 12 hour time string to a 24 hour time string

Here's how to parse dates and times using built-in .Net libraries:

static void Main(){    string strTime = "01:00:10AM";    DateTime time;    if (DateTime.TryParseExact(strTime, "hh:mm:sstt", null,         System.Globalization.DateTimeStyles.None, out time))    {        Console.WriteLine("Parsed \"{0}\" as {1:HH\\:mm\\:ss}", strTime, time);    }    else    {        Console.WriteLine("Could not parse \"{0}\" as a DateTime", strTime);    }    Console.ReadLine();}

Some points to note:

• I'm not reinventing the wheel. The .Net DateTime library is the best way to handle points in time. (Use TimeSpan for duration)
• I'm using custom DateTime format strings for both parsing the string and displaying the parsed DateTime result.
• I'm using the TryParse pattern the .Net supplies for converting strings to various built-in types: e.g., int.TryParse, double.TryParse, etc.
• In the output, I want to display the parsed time as HH:mm:ss (note that capital H is 24 hour time and lowercase h is 12 hour time). I have to escape the colons in there because of how string.Format works. You escape colons using backslashes like this HH\:mm\:ss. The problem is that you then have to escape the backslashes (or use verbatim strings). You do that with an extra backslash like this HH\\:mm\\:ss