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Razor-pages ParseExact string

I am trying to format this string into a "MM-dd-yyyy" I am not sure what I am doing wrong I know its a string that I need to get ParseExact into a date.
20210921124857177 is the value and the error I am getting is not in an acceptable format
#{var contentLastModified = #item.GetValue("LastModified").ToString();
DateTime dateTimeLastModified = DateTime.ParseExact(contentLastModified, "MM-dd-yyyy",CultureInfo.InvariantCulture);
}
<div>LastModified : #dateTimeLastModified</div>

The value 20210921124857177 does not match the format MM-dd-yyyy.
At a guess, the format you need would be yyyyMMddHHmmssfff:
DateTime dateTimeLastModified = DateTime.ParseExact(contentLastModified, "yyyyMMddHHmmssfff", CultureInfo.InvariantCulture);
/* Result: 2021-09-21 12:48:57 */

Change Date into Month Name and Date with Year in C#

I want to convert the date into something different. I give input date, it will convert into that format.
My code
var dt = erd.StartDate.Value.ToShortDateString();
var format = String.Format("{MMM/D/yyyy}", dt);
Here it is showing an error like input string is not correct format.
Help me to find out the issue?

Simply rewrite it like this (I'm assuming the erd.StartDate.Value datatype is datetime)
string result = erd.StartDate.Value.ToString("MMM/dd/yyyy");
or using "D" is equivalent to "dddd, MMMM d, yyyy"
string result = erd.StartDate.Value.ToString("D");

you need to use small d for representing Date.
you should not convert the Date into String before applying the custom Format.
Try This:
var dt = erd.StartDate.Value;
var format =dt.ToString("MMM/d/yyyy");

To solve your error, try the below code:
var dt = erd.StartDate.Value;
var format = String.Format("{0:MMMM/dd/yyyy}", dt);
You need to specify the parameter index to use. In the above code, we are telling String.Format to use parameter 0 to be formatted as a DateTime.
DateTime formatting has many types. Please see here for the different things you can do.

String was not recognized as a valid DateTime during insert

I get the following error when i try to convert to date time.
String was not recognized as a valid DateTime.
cost.b_date = DateTime.Parse(c_date.Text) ;//c_date.Text = 12/28/2012
Then i try
string date = string.Format("{0:yyyy-MM-dd}",c_date.Text);
cost.b_date = DateTime.Parse(date) ;
but i get the same exception how to fix this problem.

Using string.Format when the input is a string is pointless.
If you know the format of the string, you should use DateTime.ParseExact or DateTime.TryParseExact. For example, for the string you've got, you could use:
DateTime date = DateTime.ParseExact(text, "MM/dd/yyyy",
CultureInfo.InvariantCulture);
You should consider:
Is this user input? If so, use TryParseExact to detect user error more easily without an exception.
Do you definitely know the exact format? If not, using DateTime.TryParse may be more appropriate.
Do you definitely know the culture? If it's not the culture of the current thread, you should specify it explicitly.
Do you have to get the value as text to start with? If you could use an alternative form of input which gives you the value as a DateTime to start with, that would be preferable.

CultureInfo provider = CultureInfo.InvariantCulture;
DateTime result = DateTime.ParseExact(c_date.Text, "d", provider);

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

C# Datetime format conversion

I have a conversion problem with datetime. I have a date string as MM/dd/yyyy. Now I need to convert it to yyyy-MM-dd.
But I'm facing some error. Please help
public static DateTime ToDBDateTime(string _dateTime)
{
string sysFormat = "MM/dd/yyyy hh:mm:ss tt";
string _convertedDate = string.Empty;
if (_dateTime != null || _dateTime != string.Empty)
{
_convertedDate = DateTime.ParseExact(_dateTime, sysFormat, System.Globalization.CultureInfo.InvariantCulture).ToString(_toDBDateFormat);
//_convertedDate = Convert.ToDateTime(_dateTime).ToString(_toDBDateFormat);
/// Debug.Print(sysFormat);
}
return Convert.ToDateTime(_convertedDate);
}
And I want to know that is there is any way to pass the datetime in various formats and it would return the expected format.
E.g.: if I pass date as dd/MM/yyyy or MM/dd/yyyy, the above function would return the date in format as yyyy-MM-dd.
Please provide some suggestion to solve datetime issues.

I have a date string as MM/dd/yyyy
Right... and yet you're trying to parse it like this:
string sysFormat = "MM/dd/yyyy hh:mm:ss tt";
...
_convertedDate = DateTime.ParseExact(_dateTime, sysFormat,
CultureInfo.InvariantCulture)
You need to give a format string which matches your input - so why are you including a time part? You probably just want:
string sysFormat = "MM/dd/yyyy";
However, that's not the end of the problems. You're then converting that DateTime back into a string like this:
.ToString(_toDBDateFormat)
... and parsing it once more:
return Convert.ToDateTime(_convertedDate);
Why on earth would you want to do that? You should avoid string conversions as far as possible. Aside from anything else, what's to say that _toDBDateFormat (a variable name which raises my suspicions to start with) and Convert.ToDateTime (which always uses the current culture for parsing) are going to be compatible?
You should:
Work out how you want to handle being given an empty string or null, and just return an appropriate DateTime then
Otherwise, just parse using the right format.
This part of your question also concerns me:
E.g.: if I pass date as dd/MM/yyyy or MM/dd/yyyy, the above function would return the date in format as yyyy-MM-dd.
There's no such thing as "the date in format as yyyy-MM-dd". A DateTime is just a date and time value. It has no intrinsic format. You specify how you want to format it when you format it. However, if you're using the value for a database query, you shouldn't be converting it into a string again anyway - you should be using parameterized SQL, and just providing it as a DateTime.

As you have a date in a string with the format "MM/dd/yyyy" and want to convert it to "yyyy-MM-dd" you could do like this:
DateTime dt = DateTime.ParseExact(dateString, "MM/dd/yyyy", CultureInfo.InvariantCulture);
dt.ToString("yyyy-MM-dd");

Use the inbuilt tostring like this:
Convert.ToDateTime(_convertedDate).ToString("MM/dd/yyyy") or whatever format you want.

I tried this and its working fine.
DateTime date1 = new DateTime(2009, 8, 1);
date1.ToString("yyyy-MM-dd hh:mm:ss tt");
You can apply any format in this ToString.
Hope that helps
Milind

how to give format DateTime.Date?

DateTime dt = DateTime.Now
dt.Date is created to 31.10.2012 00:00:00 .it is created to dd.mm.yyyy format but i need dd/mm/yyyy. Can i use: return new DateTime(d.Year, d.Month, d.Day, 0, 0, 0); it will create to me dd/mm/yyyy solution?Please dont translate String.i need datetime...

The DateTime struct doesn't store any formatting information internally. If you want to output the DateTime instance as a formatted string, you just need to call ToString() with the proper format string:
var date = DateTime.Now;
var formattedString = date.ToString("dd/MM/yyyy", CultureInfo.InvariantCulture);
If you need more information on exactly which specifiers to use in your format string, check out:
MSDN - Custom Date and Time Format Strings

Just the way to convert to string, DateTime itself has no format:
var result = DateTime.Now.Date
.ToString("dd/MM/yyyy", CultureInfo.InvariantCulture);

var dt = DateTime.Now;
var stringDt = dt.Date.ToString("dd/MM/yyyy");

In you case you can simply use :
dt.ToString("dd/MM/yyyy");
Anyway there al the string format you can use with DateTime : Here.

System.DateTime does not have any format. You can view its string representation in format.
Try this
Console.WriteLine(DateTime.Now.Date.ToString("dd'/'MM'/'yyyy"));

DateTime, numeric types and most other types do not store their values in a formatted way. Rather they store their data using a binary representation. If you want to display this data to the user, you must convert it to a string. This conversion involves formatting the data.
string formattedDate = DateTime.Now.ToString("dd/MM/yyyy",
CultureInfo.InvariantCulture);
Or
Console.WriteLine("Date = {0:dd/MM/yyyy}", DateTime.Now);
Console.WriteLine converts the date into a string in order to write it to the console.

DateTime structure always has the Date and Time stored in it. If you need to extract the date alone as text you can do the following.
var date = DateTime.Now.ToString("d");
Console.WriteLine(date);
This will print the date as in the format as specified by the culture set in the system. The list of standard datetime format strings supported by dotnet framework can be found here