Format exception is being thrown

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I having a string strBuzday whose value is "09-19-2018".

string strBuzday = "09-19-2018";---Line 1

The next line is:

DateTime dt = Convert.ToDateTime(strBuzday);---Line 2

The above code does not work and

"String was not recognized as a valid DateTime" (Format exception is being thrown)

in Line 2.

I have two questions:

1.How to solve this?

2.What could be the reason as the same code works for every other developer in my team with every configuration in Visual studio being exactly the same,it does not work only for me.Why?

Edit: I ran the code in my machine and my co-workers machine and the result was same --9/20/2018 10:09:09 PM -- on the both the systems. One only difference between all other co-workers and my system is they are all on Windows 7 or 8 and I am the only one on Windows 10. So, I am assuming this may be the reason as to why I am the only one who's getting this.

If we have a look at Convert.ToDateTime code

https://referencesource.microsoft.com/#mscorlib/system/convert.cs,fce604498e2f810b

we'll find out

    public static DateTime ToDateTime(String value) {
        if (value == null)
            return new DateTime(0);
        return DateTime.Parse(value, CultureInfo.CurrentCulture);
    }

So it's CultureInfo.CurrentCulture which dictates format. To detect how Convert.ToDateTime will work, inspect CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern. If you have something like

   d.M.yyyy

then you are going to a have FormatException thrown on converting "09-19-2018" value: month can't be 19. You can either set the right CurrentCulture e.g.

  // en-US (USA) with right Date format     
  CultureInfo.CurrentCulture = CultureInfo.GetCultureInfo("en-US"); 

  string strBuzday = "09-19-2018";
  // 19 Sep 2018 
  DateTime dt = Convert.ToDateTime(strBuzday);

Or modify current culture

  CultureInfo myCulture = CultureInfo.CurrentCulture.Clone() as CultureInfo;

  myCulture.DateTimeFormat.ShortDatePattern = @"M-d-yyyy";

  CultureInfo.CurrentCulture = myCulture;

Format exception is being thrown, System. FormatException Class. The exception that is thrown when the format of an argument does not meet the parameter specifications of the invoked method. FormatException is thrown when the format of an argument in a method invocation does not match the format of the corresponding formal parameter type. "String was not recognized as a valid DateTime" (Format exception is being thrown) in Line 2. I have two questions: 1.How to solve this? 2.What could be the reason as the same code works for every other developer in my team with every configuration in Visual studio being exactly the same,it does not work only for me.Why?

I suspect that it could be a formatting issue that's stopping you. I checked it out and it doesn't throw an error for me either which is weird. If this line of code works then it is most certainly your formatting.

this.Text = "09-19-2018";
DateTime dt = DateTime.ParseExact(this.Text, "MM-dd-yyyy", null);

System.FormatException, FomatException is thrown when the format of an argument is invalid. Let us see an example. When we set a value other than int to int.Parse()  Remarks FormatException is thrown when the format of an argument in a method invocation does not match the format of the corresponding formal parameter type. For example, if a method specifies a String parameter consisting of two digits with an embedded period, passing a corresponding string argument containing only two digits to that method would cause FormatException to be thrown.

From what you say (Format exception), it will have to be converted once defined as DateTime as shown below:

DateTime dt = DateTime.ParseExact("09-19-2018", "MM-dd-yyyy", CultureInfo.InvariantCulture);

string strBuzDay = dt.ToString = ("dd-MM-yyyy", cultureInfo.InvariantCulture);

If Parse.Exact does not work, then just DateTime should do.

FormatException in C#, FormatException is thrown in a wide variety of scenarios, yet they all revolve around providing an improperly formatted argument to a vast array of  Deleting an exception has the same effect as having the exception unchecked, which is that the debugger won't break when it's thrown. To add an exception: In the Exception Settings window, select one of the exception categories (for example, Common Language Runtime). Choose the Add an exception to the selected category button (the plus sign).

.NET Exceptions - System.FormatException, Each time an exception occurs, program execution gets disrupted. else { throw new IllegalStateException( String.format("Cannot publish '%s'  Exceptions should not be returned as a return value or parameter instead of being thrown. Do not throw System.Exception, System.SystemException, System.NullReferenceException, or System.IndexOutOfRangeException intentionally from your own source code. Do not create exceptions that can be thrown in debug mode but not release mode.

Types of Exceptions in Java, If an exception is thrown, this try catch block will handle the exception to ensure that the The most common being the dreaded null reference exception. Format("Unable to find a client by id {0}", clientID)); } } public class  An exception is basically a problem occurring while a program is being executed. It is the response of the OS to any exceptional computing which results in error, and there is no direction within the program about what should be done. In programming jargon, developers say a program “throws an exception,” hence the term “throw exception”.

C# Exception Handling Best Practices, Throwing an exception halts further execution in the current control flow FormatException: Input string was not in a correct format. at System. This method declares that it either rolls back or does not rollback a transaction based on an expected exception being thrown. However, neither this exception, nor any derived exceptions can be thrown from this method, and so the annotation is useless.

Comments
  • Possible duplicate of String was not recognized as a valid DateTime " format dd/MM/yyyy"
  • Use DateTime.TryParse() instead, that way you check a bool instead of getting an exception
  • DateTime dt = DateTime.Parse(strBuzday, "M-d-yyyy", CultureInfo.InvariantCulture);
  • To follow along from what @mjwills is talking about, there are many acceptable date formats. I'm a Canadian (for whom 02/04/2018 would be April 2nd) but I live in the US, where everyone believes that that date is Feb 4th. There are also differences in date separators (slashes, dots, dashes). Your specific date is easy to parse in your head (there are only 12 months), but different machine settings could parse April 2nd/Feb 4th in different ways. Sending us the output of DateTime.Now.ToString() will allow us to get an idea about your settings
  • @mjwills I ran the code in my machine and my co-workers machine and the result was same --9/20/2018 10:09:09 PM-- on the both the systems. One only difference between all other co-workers and my system is they are all on windows 7 or 8 and i am the only one on Windows 10.So,i am assuming this may be the reason as to why i am the only one who's getting this.
  • 1.How to inspect CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern ?can u tell through code? 2.CultureInfo.CurrentCulture = CultureInfo.GetCultureInfo("en-US"); is resulting in error as CurrentCulture property is read only.
  • @Vikesh Gupta:It seems that you are using some older version of C#. 1. System.Diagnostics.Debug.Write(CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern); then see output window. 2. System.Threading.Thread.CurrentThread.CurrentCulture = CultureInfo.GetCultureInfo("en-US"); for older C# version
  • Please read the comments on the question and Dmitry's answer. This is a Culture issue. That's why it works for some and not for others.