DateTime.ToString in Mono return invalid date (“00/734718/0001 01:41:38”)

Question

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

Answer 1

That's most likely to be an ARM Mono binary layer bug. Especially since you are running a version that was release before Raspberry Pi. You will have much better luck with that on mono-devel mailing list. And it's possible that this is fixed in git already.

Answer 2

I can't reproduce your issue on Windows (don't have raspberry, but your subject says Mono).

I copied and pasted your exact source for Main() into a new Mono console app (Mono 2.6.1), added a single line (Console.ReadLine();), and ran it:

using System;

namespace TestDateTimeNow
{

  class MainClass
  {
    public 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"));
        Console.ReadLine();
    }
  }
}

I get the output below:

Answer 3

You need to use the soft floating point OS for this. 2013-05-29-wheezy-armel.zip for example.

The hard floating point doesn't work well with JITers. I had the same issue, resolved it by installing the soft floating point version of the OS on my RP. I wouldn't recommended using .net with a hard floating point OS under the raspberry pi platform. Hope this helps.

Answer 4

This is Mono bug #7938, and it affects not just DateTime.ToString, but ANY function that, directly or indirectly, passes a floating-point number to a library call, when running on ARM with a Linux distro built for the hard-float ABI. More details are available at the C# on Raspberry Pi wiki page. There is currently no good fix for this, short of running a soft-float distro. I'm still hoping we can get a fixed mono runtime soon.