Develop Reference

C# DateTime Field not formatting

I have read numerous help text and tried several different approaches to the problem with no success.
When I simply have the code line.Cells[5].Value = vo2.Rows[0]["Start"].toString(); I get 3/9/2019 8:00:00 as the result in the datagridview. I want this to be dd/mm/yyyy format.
How can I achieve this?
SmartsheetDataAdapter dataAdapter4 = new SmartsheetDataAdapter(sql10, connection);
DataTable vo2 = new DataTable();
dataAdapter4.Fill(vo2);
//double vocost = 0;
if (vo2.Rows.Count > 0)
{
DateTime thisdate = new DateTime(vo2.Rows[0]["Start"]);
//DateTime deldate = DateTime.ParseExact(dd1, "MM/dd/yyyy hh:mm:ss tt", CultureInfo.InvariantCulture);
line.Cells[5].Value = thisdate.ToString("dd/M/yyyy");
Current code gives an error:
Argument 1: cannot convert from 'object' to 'long'

You get the error because the DateTime constructor takes a long but you pass an object:
DateTime thisdate = new DateTime(vo2.Rows[0]["Start"]);
I guess that the first column in the DataTable is already aDateTime, then use this:
DateTime thisdate = vo2.Rows[0].Field<DateTime>("Start");
Otherwise you have to parse it, for example:
string dtVal = vo2.Rows[0]["Start"].ToString(); // 3/9/2019 8:00:00
DateTime thisdate = DateTime.ParseExact(dtVal, "d'/'M'/'yyyy h:mm:ss", null);
or even simpler, because with this input you don't need ParseExact but you can use Parse:
DateTime thisdate = DateTime.Parse(dtVal);

You should Convert the value read (note, that vo2.Rows[0]["Start"] is of type object when you want DateTime):
DateTime thisdate = Convert.ToDateTime(vo2.Rows[0]["Start"]);
// MM - if you want leading zero; note, that "mm" stands for minutes
line.Cells[5].Value = thisdate.ToString("dd/MM/yyyy");
Explanation of what's going on:
vo2.Rows[0]["Start" is of type object
new DateTime(long ticks) wants single long argument
The compiler complains of the argument's type given (if you call the constructor with one it must be of type long)

Parse date string with single digit day e.g. 1-11-2017 as well as 12-11-2017

So I have a date String coming in with the short date of today.
For Example "1-11-2017"
//Here i convert the HttpCookie to a String
string DateView = Convert.ToString(CurrDay.Value);
//Here i convert the String to DateTime
DateTime myDate = DateTime.ParseExact(DateView, "dd-MM-yyyy", System.Globalization.CultureInfo.InvariantCulture);
After running the code I get the error:
FormatExeption was unhandled by user code
An exception of type 'System.FormatException' occurred in
mscorlib.dll but was not handled in user code
Additional information: String was not recognized as a valid DateTime.

1-11-2017 is not in the format of dd-MM-yyyy, specifically the first part. Use d-M-yyyy instead which will use one digit day and month when the value is below 10 (ie. no 0 padding).
Test:
DateTime myDate = DateTime.ParseExact("1-11-2017", "d-M-yyyy", System.Globalization.CultureInfo.InvariantCulture);
Console.WriteLine(myDate.ToString());
If you do not know if there will be 0 padding you can pass an array of acceptable formats, the parser will try each one in order they appear in the array.
DateTime myDate = DateTime.ParseExact("1-11-2017", new string[]{"d-M-yyyy", "dd-MM-yyyy"}, System.Globalization.CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.None);
Fiddle

The Date format ddstands for The day of the month, from 01 through 31. You either supply it as 01-11-2017 or change your formatter to d-MM-yyyy.
Here's a reference to Custom Date and Time Format Strings

I solved this using yyyy-MM-dd instead of dd-MM-yyyy
(and later converting it to normal dates)
Becouse the var always was the day of today the day can be 1 and 2 digits
CurrDay.Value = DateTime.Now.ToString("yyyy-MM-dd" );
// Convert String to DateTime
dateFrom = DateTime.ParseExact(CurrDay.Value.ToString(), "yyyy-MM-dd", System.Globalization.CultureInfo.InvariantCulture);
The comments below helped me find this solution,
Thanks to everyone!

Pass the value like below,
string DateView = Convert.ToString("01-11-2017");
DateTime myDate = DateTime.ParseExact(DateView, "dd-MM-yyyy", System.Globalization.CultureInfo.InvariantCulture);

It's because ParseExact means you pass the format and the method expects the same date format to be passed as string, that's why you need to pass d-MM-yyyy instead of dd-MM-yyyy.
I you're not sure if the passed string will be with one digit or two then do the following:
string[] digits = DateView.split('-');
DateTime dateTime = new DateTime(digits[2], digits[1], digits[0]);
You even can split using / instead, but you need to make sure the first digit is a day and the second is month, and so on.
My advice is pass ticks instead of string of datetime:
DateTime date = new DateTime(numberOfTicks);
string valueAsStr = date.ToString("dd-mm-yyyy");

ParseExact DateTime error

I have a list of DateTime as strings: dd.MM.yyyy H:mm:ss (The time is 24 hours format but the hour is single digit: 6 instead of 06)
14.12.2016 6:20:21
15.12.2016 8:30:00
16.12.2016 12:30:00
17.12.2016 14:33:00
18.12.2016 18:10:00
I am trying to parse exact the string values as a DateTime object like this:
DateTime.ParseExact(dt, "dd.MM.yyyy H:mm:ss", CultureInfo.InvariantCulture) (dt is the string value from the list)
The problem is I get an error saying the string is not a valid DateTime ...
With the current format, the first and second values in the list work fine, when it get's to the third 'boooom' I get the error.
Am I missing something in my format?

Use the overload of DateTime.ParseExact that accepts an array of valid formats:
string[] formats = { "dd.MM.yyyy H:mm:ss", "dd.MM.yyyy HH:mm:ss" };
var result = DateTime.ParseExact(dt, formats, CultureInfo.InvariantCulture, 0);
UPDATE: As others have noted, H should match both one-digit and two-digit hours, so something else is going on. The following code runs successfully on my system (.NET 4.5.2):
string dt = "16.12.2016 12:30:00";
var result = DateTime.ParseExact(dt, "dd.MM.yyyy H:mm:ss", CultureInfo.InvariantCulture);

I had to parse exact the using Hour, Minute, and Second then use the ToString method to convert to a Month, day, and year format
$myStringDate=[Datetime]::ParseExact($item.myDateObject,'MM/dd/yyyy H:mm:ss',$null).ToString('MM/dd/yyyy')

Assign value of a string (containing date and time) to two different variable (one for Date and one for Time)

I have a string ("CompletionDate") which contains the value "2/28/2017 5:24:00 PM"
Now I have 2 variables (EDate and ETime). I want to assign the Date to EDate (i.e 2/28/2017) and Time to ETime (i.e. 5:24:00 PM).
How can I split the Date and Time from a single string.
Kindly Help.
My approach right now is like :
string CompletionDate = string.Empty;
string ProjectEDate = string.Empty;
string ProjectETime = string.Empty;
CompletionDate = "2017-03-29 12:58:00";
DateTime dt = DateTime.ParseExact(CompletionDate, "yyyy-MM-dd", CultureInfo.CreateSpecificCulture("en-us"));
DateTime dt1 = DateTime.ParseExact(CompletionDate, "HH:mm:ss", CultureInfo.CreateSpecificCulture("en-us"));
var ProjectEDate = dt.ToString();
var ProjectETime = dt1.ToString();
But its throwing exception that string is not in correct format. Kindly help

#Chris pointed one of your problems, but you have one more. You are passing full date time string and trying to treat it as date or time only, which is not true. Instead I suggest you to parse DateTime object with both date and time, and then take whatever you need from parsed object:
CultureInfo enUS = CultureInfo.CreateSpecificCulture("en-us");
DateTime dt = DateTime.ParseExact(CompletionDate, "yyyy-MM-dd HH:mm:ss", enUS);
var ProjectEDate = dt.Date.ToString();
var ProjectETime = dt.TimeOfDay.ToString();

You need to specify the full format as same as the input string to parse method.
DateTime dt = DateTime.ParseExact(CompletionDate, "yyyy-MM-dd HH:mm:ss", System.Globalization.CultureInfo.CreateSpecificCulture("en-us"));
To get results you can use below methods available by default in DateTime.
dt.ToShortTimeString()
"12:58 PM"
dt.ToLongTimeString()
"12:58:00 PM"
dt.ToLongDateString()
"Wednesday, March 29, 2017"
dt.ToShortDateString()
"3/29/2017"
Or you can specify the format to ToString method.
dt.ToString("yyyy-MM-dd")
"2017-03-29"
dt.ToString("HH:mm:ss")
"12:58:00"

DateTime.ParseExact(CompletionDate, "yyy-MM-dd", ...
You are missing 4th 'y' in date format string:
"yyyy-MM-dd"
^
here
and:
String was not recognized as a valid DateTime " format dd/MM/yyyy"

Why do you parse into DateTime and then convert to a string using ToString again? Couldn´t you just simply use String.Split when all you want is to split the time from the day and you know the exact format?
var CompletionDate = "2017-03-29 12:58:00";
var tmp = CompletionDate.Split(' ');
var ProjectEDate = tmp[0];
var ProjectETime = tmp[1];

Error: No overload for method "ToString" takes 1 arguments

I am trying to format date in a specific order
Time = DateTime.Parse(p.Time.ToString("dd-MM-yyyy HH:mm:ss"))
Data type of Time is DateTime
But i am getting this error:
No overload for method "ToString" takes 1 arguments.
p is the object of the table from which i am getting Time.
List<ProductImageMapWrapper> lstpm = new List<ProductImageMapWrapper>();
lstpm = _db.ProductImageMaps.Where(i => i.ClientId == null && i.BrandId == null).Select(p => new ProductImageMapWrapper
{
Time= // Problem here
}
Now, I tried using it this way
Time = DateTime.Parse(string.Format("{dd-MM-yyyy HH:mm:ss}", p.Time))
but then i got this error:
LINQ to Entities does not recognize the method System.DateTime Parse(System.String) method, and this method cannot be translated into a store expression.

String Time = Convert.ToDateTime(p.Time).ToString("dd-MM-yyyy HH:mm:ss");

It looks to me like the Time property of both types (ProductImageMap and ProductImageMapWrapper) is a DateTime. If that is true, then you should use Time = p.Time
There's a common misconception that a DateTime value somehow has a format. Actually, you apply a given format when you convert the DateTime value into a string. To copy a DateTime value from one place to another, just assign it.

parenthesis are in the wrong place. You cannot parse it as that format. You have to parse P, then format as the string.
DateTime.Parse(System.DateTime.Now).ToString("dd-MM-yyyy HH:mm:ss")

Here is the example how to parse date from string and you can correct this for your structure to work:
string p = "21-11-2013 11:12:13";
DateTime time = DateTime.ParseExact(p, "dd-MM-yyyy HH:mm:ss", System.Globalization.CultureInfo.CurrentCulture);

Considering p.Time as string value in the date format you suggested, I think you want to parse string to DateTime as,
CultureInfo provider = CultureInfo.InvariantCulture;
string format = "dd-MM-yyyy HH:mm:ss"; //This should be format that you get in string
List<ProductImageMapWrapper> lstpm = new List<ProductImageMapWrapper>();
lstpm = _db.ProductImageMaps.Where(i => i.ClientId == null && i.BrandId == null).Select(p => new ProductImageMapWrapper
{
Time = DateTime.ParseExact(p.Time, format, provider)
});

Might Help
var selectQuery=from add in db.address
select add.myDate.toString("{0:dddd, MMMM d, yyyy}");
selectQuery.Distinct();
Normal Convers.
DateTime time = DateTime.Now; // Use current time
string format = "MMM ddd d HH:mm yyyy"; // Use this format
Console.WriteLine(time.ToString(format));
1.MMM display three-letter month
2.ddd display three-letter day of the WEEK
3.d display day of the MONTH
4.HH display two-digit hours on 24-hour scale
5.mm display two-digit minutes
6.yyyy displayfour-digit year

You want to use DateTime.ToString(format) not Nullable.ToString(no
overload):
DateTime? myDate = form.dteStartDate;
string sqlFormattedDate = myDate.Value.ToString("yyyy-MM-dd HH:mm:ss");
Of course this doesn't handle the case that there is no value. Perhaps something like this:
string sqlFormattedDate = myDate.HasValue
? myDate.Value.ToString("yyyy-MM-dd HH:mm:ss")
: "<not available>";