C# DateTime TryParseExact Problems. Same pattern different year doesn't work

Question

I've a problem with DateTime TryParseExact.

I need to parse a string date in this format : "10 Fri, Jun 2013"

My pattern is : "d ddd, MMM yyyy"

Look at the code bellow

 private static readonly string[] EnglishFormats = 
    { 
        "yyyy-MM-ddTHH:mm:sszzz", "dd MMMM yyyy HH:mm" , "dddd, MMMM d, yyyy","dddd, d MMMM yyyy","dddd, MMMM d, yy","dddd, d MMMM yy","d ddd, MMM yyyy"
    };

   public static bool TryParseEnglishDate(string s, out DateTime result)
    {
        return DateTime.TryParseExact(s, EnglishFormats, CultureInfo.InvariantCulture, DateTimeStyles.None, out result);
    }

When s = "10 Fri, Jan 2014" that works ==> result = 1/10/2014 12:00:00 AM

When s = "10 Fri, Jan 2013" or other years it doesn't work ==> result= "1/1/0001 12:00:00 AM"

Have you got an idea why it doesn't work with differents year than 2014 ?

Thanks

Why are people down voting? This is a classic gotcha!

3-14159265358979323846264
– 3-14159265358979323846264

2015-07-17 09:44:49 +00:00
Commented Jul 17, 2015 at 9:44 — 3-14159265358979323846264
– 3-14159265358979323846264, Commented Jul 17, 2015 at 9:44

Adam Houldsworth · Accepted Answer · 2015-07-17 09:41:25Z

3

The 10th of Jan 2013 isn't a Friday. It parses the date correctly and doesn't selectively ignore sections of the format, so you've basically given it a date it cannot represent.

The format is fine, the string you are trying to parse is not.

answered Jul 17, 2015 at 9:41

Adam Houldsworth

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2 Comments

delcroix cedric Over a year ago

Thanks for your quick response !!! It was an example. :) But this could be a good answer ! If s = "6 Mon, Jan 2013" it doesn't work too result = "1/1/0001 12:00:00 AM"

3-14159265358979323846264 Over a year ago

Err ... that's a Sunday. Seriously ... get a calendar!

Phillip Ngan · Accepted Answer · 2015-07-17 09:42:20Z

2

10th Jan 2013 is a Thursday. So that input is not a valid date.

answered Jul 17, 2015 at 9:42

Phillip Ngan

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