Assign a string into datetime from dd/MM/yyyy into yyyy-MM-dd

Question

1.00/5 (2 votes)

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Hi all,

I need to assign a String variable into a DataTime variable by changing the format.

C#

string sDate = "21/04/1990"; // format dd/MM/yyyy

         DateTime dt;

         dt = sDate.Set_this_value_to_Dt_with_this_format("yyyy-MM-dd");

         Console.WriteLine(dt);

Finally result must be this ---> dt = 1990-04-21 <---

How can I resolve ?

Help me please

What I have tried:

I tried this code but it doesn't work

C#

string sDate = "21/04/1990"; // format dd/MM/yyyy

DateTime dt = DateTime.ParseExact(sDate, "yyyy-MM-dd", System.Globalization.CultureInfo.InvariantCulture);

Console.WriteLine(dt);
Console.ReadKey();

Posted 12-Aug-21 7:53am

antobaro

Updated 12-Aug-21 9:56am

PIEBALDconsult

v7

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Comments

PIEBALDconsult 12-Aug-21 16:12pm

A "DataTime variable" does not have a format.
You may want to alter the settings in your operating system though.

2 solutions

Solution 2

Quote:
Thank you for your solution, but isn't correct.

I don't need stringDate with this format ("yyyy-MM-dd");

I need dt with this format ("yyyy-MM-dd");

I must print this

Console.WriteLine(dt); dt=1990-04-21

Tony's solution is correct - it answers the question you asked, if not the question you meant!

DateTime values don't have a format - they are stored as a number of "ticks" since a predefined pint in time.
They only acquire a format of any kind when you convert them to a string for presentation to a user - such as when you call ToString on a DateTime variable either explicitly or implicitly. When you do that, the default Date and Time format for the system the code is running on will be used unless you explicitly supply a format string to tell it what string output you want.
See here: Formatting a DateTime for display - format string description[^]

Posted 12-Aug-21 9:35am

OriginalGriff

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Tony Hill · Accepted Answer · 2021-08-12T08:23:00

Solution 1

Try this.

C#

string sDate = "21/04/1990";

DateTime dt;

if (DateTime.TryParse(sDate, out dt))
{
    string stringDate = dt.ToString("yyyy-MM-dd");

    Console.WriteLine(stringDate );
}

Posted 12-Aug-21 8:23am

Tony Hill

Comments

antobaro 12-Aug-21 15:08pm

Thank you for your solution, but isn't correct.

I don't need stringDate with this format ("yyyy-MM-dd");

I need dt with this format ("yyyy-MM-dd");

I must print this

Console.WriteLine(dt); dt=1990-04-21

BillWoodruff 12-Aug-21 15:43pm

+5

Tony Hill 13-Aug-21 4:24am

Thanks

Tony Hill 12-Aug-21 15:53pm

Having tried your code it falls over with System.FormatException which I presume is what you meant when you said it does not work.

Your problem is you are trying to parse a date 21/04/1990 but you specify that the pattern it must match is "yyyy-MM-dd", to try and parse the date you need to use "dd/MM/yyyy".

DateTime objects do not have a format, a format is used to convert the datetime into a human readable form.

TheRealSteveJudge 13-Aug-21 4:22am

5*

Tony Hill 13-Aug-21 4:23am

Thanks