Convert a string to a datetime

Question

I am developing asp.net site using vb framework 3.5.

Im having difficulties converting string data into Date I tried using cdate function,

I have a variable sdate which is a string variable and date is stored in it which comes from textbox as dd/mm/yyyy now i want to convert this string into a Date variable as i need to perform the operations as Add a day or Subtract a day.

Please guide me how to go about this. i get the error on 3rd line as,String was not recognized as a valid DateTime. I have tried to do as follows but the error comes

Dim sdate As String  Dim expenddt As Date expenddt = Date.Parse(edate) expenddt = expenddt.AddDays(-1) 

But i get the error as

Conversion from String to type Date is not valid.

How can I get a Date from the string?

Answer 1

You should have to use Date.ParseExact or Date.TryParseExact with correct format string.

 Dim edate = "10/12/2009"  Dim expenddt As Date = Date.ParseExact(edate, "dd/MM/yyyy",              System.Globalization.DateTimeFormatInfo.InvariantInfo) 

OR

 Dim format() = {"dd/MM/yyyy", "d/M/yyyy", "dd-MM-yyyy"}  Dim expenddt As Date = Date.ParseExact(edate, format,        System.Globalization.DateTimeFormatInfo.InvariantInfo,       Globalization.DateTimeStyles.None) 

OR

Dim format() = {"dd/MM/yyyy", "d/M/yyyy", "dd-MM-yyyy"} Dim expenddt As Date Date.TryParseExact(edate, format,      System.Globalization.DateTimeFormatInfo.InvariantInfo,      Globalization.DateTimeStyles.None, expenddt) 

Answer 2

Nobody mentioned this, but in some cases the other method fails to recognize the datetime...

You can try this instead, which will convert the specified string representation of a date and time to an equivalent date and time value

string iDate = "05/05/2005"; DateTime oDate = Convert.ToDateTime(iDate); MessageBox.Show(oDate.Day + " " + oDate.Month + "  " + oDate.Year );