In my application I got error when trying to convert a Date from string date format as shown below:
dateFormat = Format(CDate("2014-mar-06"), "MM/dd/yyyy")
Error
Conversion from string "2014-mar-06" to type 'Date' is not valid
This problem only comes when my Region and Language setting is Spanish(Mexico) (or any spanish but not for others) in Windows 7 . What is the problem and how to solve this?
Avoid VB6 functions like CType and use .NET methods like TryParse instead.
Also CultureInfo.InvariantCulture gets the CultureInfo object that is culture-independent (invariant)
Try this
Dim dateString = "2014-mar-06"
Dim dateValue As DateTime
If DateTime.TryParseExact(dateString, _
"yyyy-MMM-dd", CultureInfo.InvariantCulture, _
DateTimeStyles.None, dateValue) Then
Dim myDate = dateValue.ToString("MM/dd/yyyy") 'Your Date is stored in myDate
Else
'Unable to parse your dateString
End If
Related
dim dt as string= "03/22/20 20:12:27.320"
Dim tempDate As DateTime = DateTime.ParseExact(dt, "MM/dd/yy hh:mm:ss.fff", CultureInfo.GetCultureInfo("en-US").DateTimeFormat)
This gives error sometimes : System.FormatException: 'String was not recognized as a valid DateTime.'
Why? It seems to be formatted properly. VB.net 4.6.1 framework
"hh" is 12-hour format. 20 is obviously not a valid hour in 12-hour format. If you want 24-hour format then use "HH".
Have you tried to use CDate() function?
dim dt as string= "03/22/20 20:12:27.320"
dim tempDate as Datetime = Cdate(dt)
or
dim tempDate as Datetime = Cdate("03/22/20 20:12:27.320")
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?
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)
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 );
Try to see if the following code helps you:
Dim iDate As String = "05/05/2005"
Dim oDate As DateTime = Convert.ToDateTime(iDate)
Try converting date like this:
Dim expenddt as Date = Date.ParseExact(edate, "dd/mm/yyyy",
System.Globalization.DateTimeFormatInfo.InvariantInfo);
Hope this helps.
Try to use DateTime.ParseExact method, in which you can specify both of datetime mask and original parsed string.
You can read about it here: MSDN: DateTime.ParseExact
from string dataIni = "2015/12/21 18:28", I would like to parse it into same format DateTime. I am using following code,
Dim dataIni = "2015/12/21 18:28"
Dim dataIniParsed As DateTime = DateTime.ParseExact(dataIni, "yyyy/MM/dd HH:mm", System.Globalization.CultureInfo.InvariantCulture)
However, I am getting "21/12/2015 6:28:00 PM". How to get desired format?
Once you have parsed the text into a DateTime you no longer have a "format" as a DateTime is a data type that just represents a time and a date without any particular format. It's not until you do a .ToString() or Console.WriteLine(...), for example, that the DateTime is converted to a string.
Now, by default, .ToString() produces a string format based on your system settings. Yours is clearly producing "21/12/2015 6:28:00 PM". On my system I use an ISO date format, so my .ToString() produces "2015/12/21 18:28:00" for your date.
You can produce custom formats easily though. Try this code:
Dim dataIniFormatted As String = dataIniParsed.ToString("yyyy/MM/dd HH:mm")
This produces the string "2015/12/21 18:28". Note that this is no longer a DateTime - it's a string - and also that dataIniParsed is still a DateTime (with no inherent formatting).
You can use the code below to format your Date variable. You have to format the date to get the desired result.
Dim dataIni As String = "2015/12/21 18:28"
Dim dataIniParsed As DateTime
dataIniParsed = Convert.ToDateTime(dataIni)
MsgBox(dataIniParsed & " - " & dataIniParsed.ToString("yyyy/MM/dd HH:mm") & " - " & dataIniParsed.GetType.ToString)
I just want to ask how VB.NET perform is conversion of date from string. I am currently designing a database view and convert the date into MMddyyyy format, but I am worried that CDATE it will read it as ddMMyyyy.
I want it to make it shorter and converting the date using CDATE instead of using the traditional M/d/yyyy h:mm:ss tt.
Example:
Dim myDate As Date = CDate(DataTable.Rows(0).Item("DateValue").ToString())
CDate depends on the control panel regional settings and is not recommended - you should use Date.ParseExact instead
Const MyDateFormat As String = "MMddyyyy"
Dim dte As Date = #2/1/2003#
'convert the date to a string
Dim strDate As String = dte.ToString(MyDateFormat)
'convert the string back to a date
Dim dte2 As Date = Date.ParseExact(strDate, MyDateFormat, System.Globalization.CultureInfo.InvariantCulture)
If dte = dte2 Then
MsgBox("They're the same :-) " & strDate)
Else
MsgBox("They're different :-(")
End If
For your code, it would look like:
Dim myDate As Date = Date.ParseExact(DataTable.Rows(0).Item("DateValue").ToString(), "MMddyyyy", System.Globalization.CultureInfo.InvariantCulture)
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?
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)
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 );
Try to see if the following code helps you:
Dim iDate As String = "05/05/2005"
Dim oDate As DateTime = Convert.ToDateTime(iDate)
Try converting date like this:
Dim expenddt as Date = Date.ParseExact(edate, "dd/mm/yyyy",
System.Globalization.DateTimeFormatInfo.InvariantInfo);
Hope this helps.
Try to use DateTime.ParseExact method, in which you can specify both of datetime mask and original parsed string.
You can read about it here: MSDN: DateTime.ParseExact