i have a string which has a value of "08-06-2008". I want the result to look like "08-06-08". Is there a way to do this? I've tried CDate but that only gives me 8/06/2008 which doesnt resolve the issue.
Parse it to Date and back to string:
Dim dt As Date = Date.ParseExact("08-06-2008", "MM-dd-yyyy", CultureInfo.InvariantCulture)
Dim result As String = dt.ToString("MM-dd-yy", CultureInfo.InvariantCulture)
Since that is a normal format you could also omit the format string and use Date.Parse directly:
Dim dt As Date = Date.Parse("08-06-2008", CultureInfo.InvariantCulture)
I have used CultureInfo.InvariantCulture to avoid localization issues, normally your current culture is used in Parse/ParseExact and ToString.
See: Custom Date and Time Format Strings
Firstly, avoid CDate. It is a hangover from VB6, and is almost certainly less efficient than using the .net equivalent.
The following should give you the right answer:
string value = DateTime.ParseExact("08-06-2008", "dd-MM-yyyy").ToString("dd-MM-yy")
Note that your existing date format is ambiguous, so I've been unable to tell if you're meaning the 6th of August or the 8th of June - this is why I've used ParseExact over Parse. ParseExact is also slightly more efficient, as it tells the framework which format to use, rather than it having to guess.
Try this
Dim FormatString As String = ""
Dim SampleDate As DateTime
SampleDate = Now()
FormatString = Format(SampleDate,"dd-MM-yy")
Related
I am having difficulty taking a string and converting it to a vb.net Date object, while enforcing two digit day and month. Please consider the following form example, using today's date. (02/01/2019)
Dim myDate As Date = Date.Now
Dim myDateString = String.Format("{0:D2}/{1:D2}/{2:D4}", myDate.Month, myDate.Day, myDate.Year)
myDate = DateTime.ParseExact(myDateString, "MM/dd/yyyy", CultureInfo.InvariantCulture, DateTimeStyles.None)
Label1.Text = myDate 'This will show "2/1/2019"
Label2.Text = myDateString 'This will show "02/01/2019"
This situation leaves Label1.Text as "2/1/2019", but Label2.Text as "02/01/2019". No matter what I have tried, it appears that the actual conversion from the correctly formatted String into a Date object will remove these zeros. Does anyone have any thoughts as to how I can enforce a "MM/dd/yyyy" format when converting to a Date object?
Thank you in advance,
You should consider that a DateTime variable has no format. It is just a number expressing the Ticks elapsed from the starting DateTime.MinValue (1/1/0001).
It has no memory that you have built it using a particular formatting parser.
So, when you assign a date to a string like you do in your
Label1.Text = myDate
then you are asking the ToString representation of that date. The output of this method without a formatting parameter is whatever your locale settings decide it to be. If you want to force the desidered output you need to tell the date's ToString method in what format you want the output
Label1.Text = myDate.ToString("MM/dd/yyyy")
So I have this datetime value of 9.3.2016 18:56:12, by using datetime.parse, I can get the values but instead of getting '3' as the month, it takes '9' as month and '3' as day which is incorrect.
dim d1 as string = "9.3.2016 18:56:12"
dim d2 as datetime = datetime.parse(d1, CultureInfo.InvariantCulture)
I don't want to use datetime.parseExact because I'm having more than 1 value in the database.
Please help :( thank you!
Since you current culture appears to interpret dates in the way you expect you could simply do this,
Dim dateString = "9.3.2016 18:56:12"
Dim dateValue = DateTime.Parse(dateString)
By not specifying the InvariantCulture, you instruct DateTime.Parse to use the current culture which, in your case, interprets the date string correctly.
Sorry I've got the solution.
dim d2 as datetime = convert.todatetime(d1)
I have a date in string variable strOrderEndDate which looks like this 8/14/2015.
I would like to convert it to 2015-08-14.
How do I do this in vb.net?
I tried strOrderEndDate.ToString(yyyy mmmm dd) but its not working
As the comments indicate, you first need to convert the string to a date using CDate. Then you can use the .ToString method on the new date type variable to format the output as desired:
Dim strOrderEndDate As String = "8/14/2015"
Dim datOrderEndDate As Date = CDate(strOrderEndDate)
MsgBox(datOrderEndDate.ToString("yyyy-MM-dd"))
...or as Plutonix recommends, you can use DateTime.Parse to perform the conversion. He's pretty smart so if he says it's better, then it's better.
Dim datOrderEndDate As Date = DateTime.Parse(strOrderEndDate)
Here is a peculiar result generated from this simple code:
Dim TodaysDate As Date = Date.Today ' Returns #8/12/2014#
Dim StringDate As String = TodaysDate ' Returns 12/08/2014
Dim AnotherStringDate As String = TodaysDate.ToString ' Returns 12/08/2014 00:00:00
What is going on? Why the string reversed the result, although I did not even used any conversion command?
Change Option Strict to On, then you get a compiler error instead of weird conversions. In general, a Date is not a String but it can be represented as one.
If i remember correctly VB uses helper methods with Option Strict Off to convert the type automatically which are sitting in the namespace Microsoft.VisualBasic.CompilerServices.
I've looked at the source-code (with ILSpy) and found a class StringType which has a method FromDate:
' Microsoft.VisualBasic.CompilerServices.StringType
Public Shared Function FromDate(Value As DateTime) As String
Dim ticks As Long = Value.TimeOfDay.Ticks
If ticks = Value.Ticks OrElse (Value.Year = 1899 AndAlso Value.Month = 12 AndAlso Value.Day = 30) Then
Return Value.ToString("T", Nothing)
End If
If ticks = 0L Then
Return Value.ToString("d", Nothing)
End If
Return Value.ToString("G", Nothing)
End Function
Since your Date was derived from Date.Today which is the current date without time, the code will be executed which starts with If ticks = 0L Then(ticks is from the time of the day).
This returns:
Value.ToString("d", Nothing)
which is the same as Date.ToShortDateString. The format is derived from your current culture since null is passed as CultureInfo. So obviously your current culture uses / as date separator.
You could also force this format by using:
Dim StringDate As String = TodaysDate.ToString("d")
StringDate = TodaysDate.ToShortdateString()
StringDate = TodaysDate.ToString("dd/MM/yyyy", CultureInfo.InvariantCulture)
The last option also ensures that this format is used even if your current culture is different.
A date is stored internally as number. And a date/datetime variable doesn't really know or care what actual date it represents; it is just a number (decimal). The string representation is for our eyes only. When you convert a date/datetime variable to string type, it is converted in the format specified by our machine locale settings, unless we specifically tell it to convert it to some other format.
I am assuming that the date/time settings on your PC is in the dd/mm/yyyy (indian format) format rather than the default mm/dd/yyyy (US format).
So this is what is actually happening:
' You store today's date in a Date variable and it returns #8/12/2014# i.e. 12-Aug-2014
Dim TodaysDate As Date = Date.Today
' You convert it to string. Since you didn't sepecify the format, it picks up the fromat settings from your PC regional settings.
' Returns 12/08/2014 which means 12-Aug-2014 (in your locale)
' You didn't do .ToString, but that's implicit, unless you set OPTION STRICT ON, in which case it will force you to put .ToString
Dim StringDate As String = TodaysDate
' Same argument as above.
Dim AnotherStringDate As String = TodaysDate.ToString ' Returns 12/08/2014 00:00:00
As for the question why converting a date to a string changes the order? The answer is that it doesnt.
When you convert to string, your local culture format is used, as explained by Tim. That's not teh case with Date literals in VB.
Date literals - values between hashes such as #02/11/2014# - are always displayed in InvariantCulture or "m/d/y" pattern. This is likely because when you wish to create a date using a literal, you must specify the Day and Month in that format. See MSDN:
Date literals must be in the format #m/d/yyyy# or they are invalid.
So, it would make no sense to display the date to you in one pattern but require you to create them using a different pattern. This is just the way VB works (in part because the legacy functions have no notion of cultures beyond the local one in use). This is a VB-ism as seen in this VB vs C# date display in Visual Studio:
The culture is set to fr-FR.
But your strings ultimately represent the same date - they can make a roundtrip:
Dim TodaysDate As Date = Date.Today ' Returns #8/12/2014#
Dim AnotherStringDate As String = TodaysDate.ToString
Dim mydt As DateTime = DateTime.Parse(AnotherStringDate)
If mydt = TodaysDate Then
Console.Beep()
End If
It will beep because the same DateTime is created from the string even though it may display in the pattern of "d/m/y" for yur culture.
Im a complete NOOB in VB so please excuse the newbie question
Im running the following code which produces the current system date, as you can see in image below.
Dim cyear As Date
cyear = Date.Now
MsgBox(cyear)
My Question
I'm looking for a way to remove all the characters in the textbox above so that only the highlighted yellow numbers will remain. Which represents the last 2 digits of the current year.
You'll have to use a date format string, e.g.:
Dim value = String.Format("{0:yy}", DateTime.Now)
or
Dim value = DateTime.Now.ToString("yy")
Have a look at Custom Date and Time Format Strings.
Format the date before you output it:
Dim cyear As Date
cyear = Date.Now
Dim yearShort as string = cyear.ToString("yy")
MsgBox(yearShort)
For more formats, read here: http://msdn.microsoft.com/library/8kb3ddd4%28v=vs.110%29.aspx
It's best to simply pass a format to the tostring method.
DateTime.Now.toString("yy")
If that doesn't work...
DateTime.Now.toString("yyyy").Substring(2,2)
http://msdn.microsoft.com/en-us/library/zdtaw1bw(v=vs.110).aspx