String was not recognized as a valid DateTime

am trying to parse the string: 07/27/11 074854 using the following:
strdate = Date.Parse(Date_Time_Measured).ToString("yyyy MM dd HH:mm:ss")

use different format like

strdate = Date.Parse(Date_Time_Measured).ToString("MM/dd/yy HHmmss")
strdate = Date.Parse(Date_Time_Measured).ToString("MM/dd/yyyy HHmmss")

try this:

Try
  strdate = Date.Parse(Date_Time_Measured).ToString("MM/dd/yy HHmmss")
Catch ex As Exception
  strdate = Date.Parse(Date_Time_Measured).ToString("MM/dd/yy HH:mm:ss")
End Try

No this gave me an error message String was not recognized as a valid DateTime

try this:

dim dt as Datetime
dt = DateTime.ParseExact(myds,"MM/dd/yy HHmmss",CultureInfo.InvariantCulture)

and then use

dt.ToString("the format you like here")

for example

now.toString("MM/dd/YYYY HH:mm:ss tt")

OK what is myds and cultureInfo both are returning undeclaired

myds is the date string and use

System.Globalization.CultureInfo.InvariantCulture

instead of

CultureInfo.InvariantCulture

I get a FormatException was unhandled with the following code:

  Dim dt As DateTime
            dt = DateTime.ParseExact(Date_Time_Measured, "MM/dd/yy HHmmss", System.Globalization.CultureInfo.InvariantCulture)
            Now.ToString("MM/dd/YYYY HH:mm:ss tt")

>Now.ToString("MM/dd/YYYY HH:mm:ss tt")

Do you get the error on above line?

YYYY -> yyyy

Why do you have that line anyway?

No I get the error on the following line:
  dt = DateTime.ParseExact(Date_Time_Measured, "MM/dd/yy HHmmss", System.Globalization.CultureInfo.InvariantCulture)

did you add this to your page

Imports System.Globalization

Yes. I dont understand why the format "07/25/11 074854" doesn;t get recognized.

this is working fine for me

Imports System.Globalization
...
dim myDS as string = "07/27/11 074854"
now = DateTime.ParseExact(myds,"MM/dd/yy HHmmss",CultureInfo.InvariantCulture)
response.write(now.toString("MM/dd/YYYY HH:mm:ss tt"))

oops, it should be yyyy

dim myDS as string = "07/27/11 074854"
now = DateTime.ParseExact(myds,"MM/dd/yy HHmmss",CultureInfo.InvariantCulture)
response.write(now.toString("MM/dd/yyyy HH:mm:ss tt"))

and result is

07/27/2011 07:48:54 AM

When I use your code I get an error property NOW is ReadOnly ?????

use this (now was a just variable):

dim myDS as String = "07/27/11 074854"
dim myDT as DateTime = DateTime.ParseExact(myds,"MM/dd/yy HHmmss",CultureInfo.InvariantCulture)
response.write(myDT.toString("MM/dd/yyyy HH:mm:ss tt"))

OK It does work with your code above however when I use the following

dim Date_Time_Measured as string
 Dim myDT As DateTime = DateTime.ParseExact(Date_Time_Measured, "MM/dd/yy HHmmss", CultureInfo.InvariantCulture)
            strdate = myDT.ToString("MM/dd/yyyy HH:mm:ss tt")


I still get the same error. If I add this line
Date_Time_Measured = "07/27/11 074854"

It works correctly, however the Date_Time_Measured is always changing dates.

you should use "try catch block"

are you using this in loop? how it is changing? you said there will be two different formats, and I put both in try...catch... block... see code below

dim Date_Time_Measured as string = "...."
Dim myDT As DateTime

Try
  myDT = DateTime.ParseExact(Date_Time_Measured, "MM/dd/yy HHmmss", CultureInfo.InvariantCulture)
Catch ex As Exception
  myDT = DateTime.ParseExact(Date_Time_Measured, "MM/dd/yy HH:mm:ss", CultureInfo.InvariantCulture)
End Try

strdate = myDT.ToString("MM/dd/yyyy HH:mm:ss tt")

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It still is giving me the original error about the string not being a valid DateTime

what code are you using now, and what kind of data do you have?
on which line do you get that error, exact error message please...

If I use this code below, the problem file will get caught in the try catch and just assign whatever string is in the Date_Time)Measured variable to the strdate string variable.

Try
                strdate = Date.Parse(Date_Time_Measured).ToString("yyyy MM dd HH:mm:ss")
            Catch ex As Exception
                strdate = Date_Time_Measured
            End Try

strdate = Date.Parse(Date_Time_Measured).ToString("yyyy MM dd HH:mm:ss")

this says, convert Date_Time_Measured to date (but it does not say use this pattern) then convert it to string in "yyyy MM dd HH:mm:ss" format...

all the codes I posted are using a format to convert the string to datetime which you miss that point...

dim Date_Time_Measured as string = "...."
Dim myDT As DateTime
Dim strdate as string

Try
  myDT = DateTime.ParseExact(Date_Time_Measured, "MM/dd/yy HHmmss", CultureInfo.InvariantCulture)
Catch ex As Exception
  Try
    myDT = DateTime.ParseExact(Date_Time_Measured, "MM/dd/yy HH:mm:ss", CultureInfo.InvariantCulture)
  Catch ex As Exception
    strdate = Date_Time_Measured
  End Try
End Try

if strdate is not nothing then strdate = myDT.ToString("MM/dd/yyyy HH:mm:ss tt")

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This code that you provided me when implemented it says the ex hides a variable in an enclosing block

Dim myDT As DateTime
            Try
                myDT = DateTime.ParseExact(Date_Time_Measured, "MM/dd/yy HHmmss", CultureInfo.InvariantCulture)
            Catch ex As Exception
                Try
                Catch ex As Exception
                    myDT = DateTime.ParseExact(Date_Time_Measured, "MM/dd/yy HH:mm:ss", CultureInfo.InvariantCulture)

                    strdate = Date_Time_Measured
                End Try
            End Try

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instead of ex use e or x on line 6

OK using the code: Dim temp As DateTime = DateTime.ParseExact(strdate.Trim(), "MM/dd/yy hhmmss", System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat)

That you provided me. It somehow doesn;t work when I get this string:" 11/10/11 130220" but when I get this string "07/27/11 074854" Iit works just fine.

Does it have something to do with the 24 hour clock?