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Error: String was not recognised as a valid Datetime format [duplicate]

I have a string like this:
250920111414
I want to create a DateTime object from that string. As of now, I use substring and do it like this:
string date = 250920111414;
int year = Convert.ToInt32(date.Substring(4, 4));
int month = Convert.ToInt32(date.Substring(2, 2));
...
DateTime dt = new DateTime(year, month, day ...);
Is it possible to use string format, to do the same, without substring?

Absolutely. Guessing the format from your string, you can use ParseExact
string format = "ddMMyyyyHHmm";
DateTime dt = DateTime.ParseExact(value, format, CultureInfo.InvariantCulture);
or TryParseExact:
DateTime dt;
bool success = DateTime.TryParseExact(value, format,
CultureInfo.InvariantCulture, DateTimeStyles.None, out dt);
The latter call will simply return false on parse failure, instead of throwing an exception - if you may have bad data which shouldn't cause the overall task to fail (e.g. it's user input, and you just want to prompt them) then this is a better call to use.
EDIT: For more details about the format string details, see "Custom Date and Time Format Strings" in MSDN.

You could use:
DateTime dt = DateTime.ParseExact(
date,
"ddMMyyyyHHmm",
CultureInfo.InvariantCulture);

string iDate = "05/05/2005";
DateTime oDate = Convert.ToDateTime(iDate);
DateTime oDate = DateTime.ParseExact(iString, "yyyy-MM-dd HH:mm tt",null);
DateTime Formats

Format DateTime object from System time format to required format

My system time is of the format dd-MMM-yy (02-Dec-16). The format I want to convert it to is "yyyy/MM/dd". I've basically been playing around with all the other datetime formats that my system offers and this is the parsing statement I've figured out that works for All of them (except this) -
CultureInfo provider = CultureInfo.InvariantCulture;
string date_format = "yyyy/MM/dd HH:mm:ss tt";
DateTime now_value = DateTime.ParseExact(DateTime.Now.ToString(date_format), date_format, provider);
return now_value.ToString(date_format);
But this doesn't work for the aforementioned dd-MMM-yy format. Can someone please tell me what I am doing wrong here?
(Sidebar -Is there a more efficient way in which I can write this above snippet?)

You don't need to convert DateTime to string and then convert back to DateTime and again back to string, if you have DateTime input just call the ToString with the format as below
string dt =DateTime.Now.ToString("yyyy/MMM/dd", CultureInfo.InvariantCulture);
for your example :
DateTime now_value = DateTime.ParseExact("02-Dec-16", "dd-MMM-yy", System.Globalization.CultureInfo.InvariantCulture);
return now_value.ToString("yyyy/MM/dd");

Try This:
string date_format = "yyyy-MMM-dd";
string date_now = DateTime.Now.ToString(date_format,CultureInfo.CreateSpecificCulture("en-US"));
return date_now;
Even This should also work:
string date_format = "yyyy-MMM-dd";
string date_now = DateTime.Now.ToString(date_format);
return date_now;

I think best way would be to create an extension method for multiple date formats,
var inputDate = "02-Dec-2016";
string[] availaible_input_date_format = { "dd-MMM-yyyy", "dd/MMM/yyyy" }; // add as many formats availible
var date_format = "yyyy/MMM/dd";
DateTime outputDate;
DateTime.TryParseExact(inputDate, availaible_input_date_format, null, DateTimeStyles.None, out outputDate);
Console.WriteLine(outputDate.ToString(date_format));

You can try this:
datetime yourdatetime = new datetime();
string converteddatetime = yourdatetime.toString("yyyy/MM/dd");

C# Converting MMddyy formated string to Datetime

I have string in format MMddyy for example '112192' which I need to convert in DateTime object.
If I tried to split string and use new DateTime(yy, mm, dd); but is sets year as 0092. But I needed it as 1992.
I am also tried this:
DateTime.TryParseExact(str, "MMddyy", System.Globalization.CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.None, out date);
But it returns date with DateTime.MinValue

Alternatively, you can do it by this way
string str = "112192";
DateTime date = DateTime.ParseExact(str, "MMddyy", CultureInfo.InvariantCulture);
Console.WriteLine(date.ToString("yyyy"));
Also, your approach is working
DateTime date;
string str = "112192";
bool success = DateTime.TryParseExact(str, "MMddyy", System.Globalization.CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.None, out date);
Console.WriteLine(date.ToString("yyyy"));

I solved the same issue like this:
string strdate = "9/10/2017"; // mm/dd/yyyy
DateTime oDate = DateTime.ParseExact(strdate, "M/d/yyyy", System.Globalization.CultureInfo.InvariantCulture); Console.WriteLine(oDate.Day);
Console.WriteLine(oDate.Day);

Convert a string to datetime format in asp .net

I have a date time string "12-24-2013 15:19:29" which is in "MM-dd-yyyy HH:mm:ss". I want to convert this string to datetime. But the format should not change.ie, it should be the same "MM-dd-yyyy HH:mm:ss" format.
When I used following method,
DateTime dt2 = DateTime.ParseExact(date31strin, "MM-dd-yyyy HH:mm:ss", CultureInfo.InvariantCulture);
the format is changed to "dd-MM-yyyy HH:mm:ss". I have tried some other method also, but still getting this same format.

First, you should be parsing the string to a DateTime and then format it to the second format using ToString() method.
//Convert your string to a DateTime
DateTime dt2 = DateTime.ParseExact(date31strin,
"MM-dd-yyyy HH:mm:ss", CultureInfo.InvariantCulture);
//If you want to change the format
string secondFormat = dt2.ToString("Second format string");
Note: Date is a Date and it does not have a format. If you need to convert the string to a DateTime, first line of code is enough

You are not changing the format.
You are parsing a string into a DateTime object which does not have a format.
When you decide to present the DateTime, you can format it any way you wish.

to parse String to DateTime use method DateTime.TryParse (http://msdn.microsoft.com/cs-cz/library/ch92fbc1%28v=vs.110%29.aspx) and then use DateTime formating (http://msdn.microsoft.com/en-us/library/az4se3k1%28v=vs.110%29.aspx) to output to aspx page

//frndzz if you are using j query and you don't convert date in(MM/dd/yyyy) to //(dd/MM/yyyy) then this code will help you
// i try it and i get the answer
string sd=txtmydate.Text //sd=04/27/2015 (MM-dd-yyyy) format
string [] sdate = sd.Split('-');
string fd = sdate[1];
fd=string.Concat(sdate[1],"-",sdate[0],"-",sdate[2]);
DateTime dt = Convert.ToDateTime(fd);
txtshow.Text = dt.ToString("dd/MM/yyyy");
//txtshow will show you date as 27-04-2015 (dd/MM/yyyy) format
thanks

How to convert string to DateTime:
string iDate = "Absent";
aEmployeeAttendence.Intime = DateTime.Parse(iDate);
//aEmployeeAttendence (object)
//Intime (field)

CONVERT MM/DD/YYYY HH:MI:SS AM/PM to DD/MM/YYYY in C#

How can I convert MM/DD/YYYY HH:MI:SS AM/PM into DD/MM/YYYY using C# ?I am using C#2008.
Thanks

Use TryParseExact to parse to a DateTime, then ToString with a format string to convert back...
DateTime dt;
if (DateTime.TryParseExact(value, "MM/dd/yyyy hh:mm:ss tt",
CultureInfo.InvariantCulture, DateTimeStyles.None,
out dt))
{
string text = dt.ToString("dd/MM/yyyy", CultureInfo.InvariantCulture);
// Use text
}
else
{
// Handle failure
}

As the time part is irrelevant, you can truncate that before parsing and re-formatting:
date = DateTime.ParseExact(date.Substring(0, 10), "MM'/'dd'/'yyyy", CultureInfo.InvariantCulture).ToString("dd'/'MM'/'yyyy");
Edit:
As your comment reveals that you don't want a string as result, you should not format the date into a string, just get the date as a DateTime value:
Datetime dbDate = DateTime.ParseExact(date.Substring(0, 10), "MM'/'dd'/'yyyy", CultureInfo.InvariantCulture);
Now you can use the DateTime value in your code, wrapping it in a database driver type if needed.

If this is a DateTime object, you should be able to just select a different format.
If it is a string, use the following:
public string convert(string date){
string[] pieces = date.Split("/");
string day = pieces[1];
string month = pieces[0];
string year = pieces[2].split(" ")[0];
return day + "/" + month + "/" + year;
}