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PODateTime.ToString in Mono return invalid date ("00/734718/0001 01:41:38")
 

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  1. PODateTime.ToString in Mono return invalid date ("00/734718/0001 01:41:38")
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    <p>I am trying to get mono (Debian 2.10.8.1-5) to run properly on my raspberry pi with the raspbian distro ("Debian GNU/Linux wheezy/sid"). I have installed mono with apt-get install mono-complete.</p> <p>However, I am running into an interesting issue that I cannot figure out. The DateTime.ToString() method returns an invalid string.</p> <p>Below you can find my sample program with the console output:</p> <pre><code>using System; namespace MonoTest { class Program { static void Main(string[] args) { DateTime now = DateTime.Now; Console.WriteLine("Year: " + now.Year); Console.WriteLine("Month: " + now.Month); Console.WriteLine("Day: " + now.Day); Console.WriteLine("DayOfWeek: " + now.DayOfWeek); Console.WriteLine("DateTime.Now: " + DateTime.Now); Console.WriteLine(DateTime.Now.ToString("yyyy-MM-dd")); } } } </code></pre> <p>Output:</p> <pre><code>pi@raspberrypi ~/bin $ mono MonoTest.exe Year: 2012 Month: 8 Day: 3 DayOfWeek: Friday DateTime.Now: 00/734718/0001 01:41:38 0001-00-734718 </code></pre> <p>Interestingly enough, 734718 seems to be the the number of days elapsed till today since 01/01/0001. I have tryed it with a fresh installation on a second board but with the same issue.</p> <p>Does anyone have an idea what the problem here is and how to convince DateTime.ToString() to return the right value?</p> <p><strong>Update (8/4/2012):</strong> After long digging through the mono source code I was able to trace the issue back to System.Math.Floor. Apparently, it always returns 0. I changed my test program to a simple:</p> <pre><code>static void Main(string[] args) { Console.WriteLine("Floor(1.5): " + System.Math.Floor(1.5)); } </code></pre> <p>On Windows the result is "Floor(1.5): 1" Whereas on my mono setup on the raspberry pi is "Floor(1.5): 0". I have seen that System.Math.Floor is implemented as</p> <pre><code>[MethodImplAttribute (MethodImplOptions.InternalCall)] public extern static double Floor (double d); </code></pre> <p>Tomorrow, I will look further into this issue. Does anyone know why this issue could exist?</p>
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    1. COI stepped on this problem too. Have you found any solution?
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    2. COMaybe related: `DateTime.Now.ToString("MM")` throws `System.ArgumentOutOfRangeException` on my raspberry-pi using mono 2.10.8.1
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