Windows Service gives String was not recognized as a valid DateTime exception but the same code running properly in Console Application

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Windows Service gives String was not recognized as a valid DateTime exception but the same code running properly in Console Application

Object max = cmd.ExecuteScalar();   //max will have 6/30/2012 12:00:00 AM 
DateTime currentDt = DateTime.Now;
currentDt = DateTime.ParseExact(max.ToString(), "M/d/yyyy h:mm:ss tt", CultureInfo.CurrentCulture.DateTimeFormat);                         //This Line Gives Error in WindowsService Only
StreamWriter sw = new StreamWriter("E:\\ram\\SampleService.txt", true);
sw.WriteLine(currentDt.ToString());
sw.Close();

I even Changed System DateTime Format Settings to Engish - Us Settings.ShortDatetime is M/d/yyyy and Longtime is h:mm:ss tt.

Can someone help me resolve this issue?

My guess is that the system locale isn't the same as your user locale. If your system locale uses something other than "/" as the date separator, it will fail to match the "/" in your format string.

I suggest you change to use CultureInfo.InvariantCulture, at which point it should work - if the value of max.ToString() is actually "6/30/2012 12:00:00 AM". Have you validated that in the case it's failing, that's the value you're getting?

If your value is coming from a database though, why is it stored as a string to start with? Are you sure it even is a string? If it's actually a DateTime, then when you call ToString() you'll be using the current culture's default format to convert it - which could easily fail on the way back. Even if it is a string at the moment, does it really have to be? The fewer string conversions you can introduce, the better.

(As an aside, it's simpler to use File.WriteAllText or File.AppendAllText than using a StreamWriter like this. If you do need to use a StreamWriter, remember to use a using statement to dispose of the resource properly.)

"String Was Not Recognized as a Valid DateTime." Why it Happens., Datetime mistake: string not recognized as valid datetime. big a role it plays in the consistency and correction of your application. Go ahead, create a console app and place that line of code in it. So, who gets to decide which format is acceptable when parsing Edit your code and run the app again. String not recognized as a valid datetime Means that somewhere, a string is being converted to a DateTime, not converted from a DateTime to a string. Start with the debugger, and look at the code that generates the exception - the chances are it's something like Convert.ToDateTime , and you need to look at exactly what the string you are trying

Does your SQL request return DateTime or String value?

Also I don't see why do you use ParseExact in this case. In your case I would suggest to use Parse method with InvariantCulture parameter:

currentDt = DateTime.Parse(max.ToString(), CultureInfo.InvariantCulture);

If your max value is DateTime then you don't need to do parsing at all. You just need to check if it is DBNull.Value:

if (max != DBNullValue)
{
    currentDt = (DateTime)max;
}

System.FormatException: String was not recognized as a valid , We're just using Parse for simple push notifications (for now), and FormatException: String was not recognized as a valid DateTime. to go through the code and try/catch around parsing date/time strings. I don't look kindly on SDK's that crash my app in unexpected ways. InvariantCulture); Console. Yes in Windows 10 it is work Correctly but in windows 7 it not work i think in windows 7 i should add Persian Calendar as Default or add some code

Try it without the CultureInfo:

currentDt = DateTime.ParseExact(max.ToString(), "M/d/yyyy h:mm:ss tt", null);

DateTime.Parse Method (System), The modified code either runs in the interactive window or, if compilation fails, the Parse a date and time string and perform a conversion to UTC or local time. of an unrecognized string format, the Parse method throws a FormatException, whereas the s does not contain a valid string representation of a date and time. The solution here is not to just try-catch. DateTime is a struct in C#, so what date could we possibly return that makes sense for an arbitrary invalid date field?. I firmly believe that crashing is the right response in this case, because that allows us to properly handle the problem rather than just treating the symptoms.

I got same problem when i had been building windows service.In that, i tryed to convert string date to datetime format. For that i used format string date_time = Day + "/" + Mn + "/" + Yr + " " + Hr + ":" + Min; and tryed convert it to datetime(). This format was running properly in windows form application but not in Windows service project.

Solution :

I changed above string format with this format string date_time = Mn + "/" + Day + "/" + Yr + " " + Hr + ":" + Min;, And then passed it to datetime(). Like follow :

string date_time = Mn + "/" + Day + "/" + Yr + " " + Hr + ":" + Min; DateTime dt_1 = Convert.ToDateTime(date_time);

By default the en-US culture is used by .NET according to which the Date is in Month/Day/Year format

This is 100% working.

String was not recognized as a valid DateTime because the day of , I am trying to view a webpage and I keep getting the following error: Server trace for more information about the error and where it originated in the code. [​FormatException: String was not recognized as a valid DateTime because running the same Vista O/S, same IEv7 and I am running IEv7there  Problem parsing dates, String was not recognized as a valid DateTime Nov 24, 2011 02:50 AM | ultreia | LINK Hello I have a service that was running OK in a IIS 5 over Windows 2000 Spanish with a regional configuration of Spain-Spain-Traditional Sort and now in a IIS 7 over Windows 2008 R2 English with the same regional configuration is sending

Intel® AMT SDK Implementation and Reference Guide, Indicates whether or not the job should be automatically deleted upon The User that submitted the Job, or the Service or method name that caused The Description property provides a textual description of the object. datetime, TimeOfLastStateChange used the string property and did not want to modify their code. Windows Service gives String was not recognized as a valid DateTime exception but the same code running properly in Console Application Object max = cmd.ExecuteScalar(); //max will have 6/30/201

Chapter 4. Console Input and Output, For each console application the operating system connects input and output devices. When starting a given console program, system code running at the initialization of the Console give us the convenience for working with input-​output console In general C# does not allow the use of operators over string objects. Re: String was not recognized as a valid Date Time. Apr 18, 2013 10:14 AM | Rion Williams | LINK It sounds like you are attempting to parse a string object as a DateTime ( possibly using Convert.ToDateTime() or DateTime.Parse() etc ) but your string is not in a format that can be parsed.

C# and ASP.NET Question and Answers, Net provides a cache object for eg: cache["States"] = dsStates; NET and that doesn't use code-behind? Or even applications running on the same platform that have been Both the Windows Service and SQL Server solutions support a But If the string is not a valid DateTime,It throws an exception. FormatException: String was not recognized as a valid DateTime. That means whatever you have in that "OilServiceDateField" string does not represent a date time format that is recognised. If you have a custom date-time string format you may have another look at the answer @DavoBlackOut posted.

Comments
  • @user1841000: Did you see my other point about the string though? Have you logged the value of max before trying to parse it? I strongly suspect you'll find you're getting a different value in the failing case.
  • @user1841000: Well what is the type of max? It sounds like it's probably a DateTime already - in which case you should just cast to DateTime instead of going via a string. It's the double string conversion which is causing the problem.
  • If you pass null as provider argument, it will use the current culture, which will effectively be the same as the current code.