Parsing "HH:mm:ss" and "H:m:s" times using DateTime.ParseExact()

I want to be able to parse the fol开发者_开发问答lowing times using ParseExact() function:

01:02:03
1:02:03
1:2:03
1:02:3
01:2:3
1:2:3

Is it possible, or do I need to do my own conversions so it work?

So far I can parse only all with leading 0 or all without leading zero. I can do it with 6 format strings but i think this is pretty stupid.

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Using ParseExact with the "H:m:s" custom format string works perfectly for all the examples given in your question.

string[] test = { "01:02:03", "1:02:03", "1:2:03", "1:02:3", "01:2:3", "1:2:3" };

foreach (string s in test)
{
    DateTime d = DateTime.ParseExact(s, "H:m:s", null);
    Console.WriteLine(d);
}

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Have you tried this? All strings parse without a problem in this sample code:

using System;

class Program {
    static void Main(string[] args) {
        string[] dates = new string[] { "01:02:03", "1:02:03", "1:2:03", "1:02:3", "01:2:3", "1:2:3" };
        foreach (string date in dates) {
            DateTime dt = DateTime.ParseExact(date, "H:m:s", null);
            Console.WriteLine(dt);
        }
        Console.ReadLine();
    }
}

Output:

11/9/2009 1:02:03 AM
11/9/2009 1:02:03 AM
11/9/2009 1:02:03 AM
11/9/2009 1:02:03 AM
11/9/2009 1:02:03 AM
11/9/2009 1:02:03 AM

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I think the purpose of ParseExact() requires an exact match of the format string. Is there a reason not to simply use the Parse() method instead?

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Why not just use Parse? As its name implies, ParseExact is used when you have exactly one input format and all others must be rejected.