String Was Not Recognized as a Valid Datetime " Format Dd/Mm/Yyyy"

date format issue, String was not recognized as a valid DateTime

2 steps:

DateTime pDate = DateTime.ParseExact("05/28/2013 12:00:00 AM", "MM/dd/yyyy hh:mm:ss", CultureInfo.InvariantCulture);


return pDate.ToString("dd/MM/yyyy");

how to fix string was not recognized as a valid DateTime

Convert.ToDateTime will take into account the current systems Culture and thus expects the string to be in a certain format.
See more info here:
https://docs.microsoft.com/en-us/dotnet/api/system.convert.todatetime?view=net-6.0#System_Convert_ToDateTime_System_String_System_IFormatProvider_

To make this code work on the other system, you could change the system language used, but a better solution is to make sure that the input value is in the current cultures format, or use the second parameter for Convert.ToDateTime() which is an IFormatProvider to tell the system which culture to use. That way it will not matter anymore what system runs the code.

In your case you could also write:

temp = new DateTime(DateTime.Now.Year, DateTime.Now.Month + 1, dateAf.Date.Day)

instead of

temp = Convert.ToDateTime("" + dateAf.Date.Day + "/" + (DateTime.Now.Month + 1) + "/" + DateTime.Now.Year);

to avoid the date parsing all together. Make sure to not do this when the month is december as that would still result in an invalid datetime.

If you are simply trying to achieve getting the current DateTime + 1 month you could do this:

temp = DateTime.Now.AddMonths(1);

which will also work when the current date is in december, and will result in a date in januari the next year.

String was not recognized as a valid DateTime. format yyyy-MM-dd how i can use this format

In your JS it looks like you expecting string that contains date in this format
format: "yyyy/MM/dd
So both of your parsing should be invalid.

So how this DateTime.ParseExact works:

You have input string that can be formatted in different ways.

DateTime.ParseExact is defined:

public static DateTime ParseExact (string s, string format, IFormatProvider? provider);

docs:
https://docs.microsoft.com/en-us/dotnet/api/system.datetime.parseexact?view=net-5.0

• So what it means is that s is input date string that you want to parse.
• String format tells the method what format is your input string.
• And provider is an object that supplies culture-specific format information about s.

So example:

var dateString = "11/04/2021";

If you do:

 var date = DateTime.ParseExact(dateString, "dd/MM/yyyy", new CultureInfo("en-US"));

Your date will be 11th April 2021

But if you do:

var date = DateTime.ParseExact(dateString, "MM/dd/yyyy", new CultureInfo("en-US"));

Your date will be 4th November 2021

Addition:

If you try this:

var date = DateTime.ParseExact(dateString, "MM-dd-yyyy", new CultureInfo("en-US"));

You will be thrown System.FormatException: "String was not recognized as a valid DateTime." simply because string is "11/04/2021" and you telling your parser to expect "MM-dd-yyyy"
Hope its clearer now.

String was not recognized as a valid DateTime format dd/MM/yyyy

Use DateTime.ParseExact.

this.Text="22/11/2009";

DateTime date = DateTime.ParseExact(this.Text, "dd/MM/yyyy", null);

String was not recognized as a valid DateTime format dd/MM/yyyy

As Patrick Artner noted, your pattern does not match your format.

The correct format is "M/d/yyyy hh:mm:ss tt" with

M ... Represents the month as a number from 1 through 12.

d ... Represents the day of the month as a number from 1 through 31

C# - String was not recognized as a valid DateTime

The format string should be yyyy-MM-ddTHH:mm:ssK or yyyy-MM-ddTHH:mm:sszzz. notice the lack of - in the format string.

Dateformat is right but getting String was not recognized as a valid DateTime

You've specified in your format string that the days and months must be double digits, but it appears that your input can be single digits.

In order to solve this, you need to specify a single digit in the format string by using a single d for the day portion (and a single M for the month, too).

It's also safe to use a single digit in the format string, since it will handle both single and double digits.

So your format string should look like: "d/M/yyyy"

For example, these all work:

var a = DateTime.ParseExact("1/8/2019", "d/M/yyyy", CultureInfo.CurrentCulture);
var b = DateTime.ParseExact("1/08/2019", "d/M/yyyy", CultureInfo.CurrentCulture);
var c = DateTime.ParseExact("01/8/2019", "d/M/yyyy", CultureInfo.CurrentCulture);
var d = DateTime.ParseExact("01/08/2019", "d/M/yyyy", CultureInfo.CurrentCulture);

string was not recognized as valid date time when CultureInfo is set to a different language

This is what I did to fix above issue:

if (DOB != "")
{
    DOB = DOB.Replace("/", "-");

    DateTime formatDate =
         DateTime.ParseExact(DOB, 
            new string[] { "M-d-yyyy", "dd-MM-yyyy" },
            System.Globalization.CultureInfo.InvariantCulture, 
            System.Globalization.DateTimeStyles.None);

    DOB = formatDate.ToString("yyyy-MM-dd");

}

Error: String was not recognized as a valid DateTime in C#

The format string HH refers to 24-hour format and cannot be used in conjunction with tt. Use hh instead. This:

DateTime check = DateTime.ParseExact(recorded, "MM/dd/yyyy hh:mm:ss tt", CultureInfo.InvariantCulture);

works just fine.

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