Datetime - .Net Is With DataRow.IsNull Or Format(datetimevalue,"T")?
Apr 14, 2011
I am working on a new ASP.Net 4.0 data driven app. In the DAL I check for NULL values on all my data and default to the proper data when NULL. I have a strange issue going on. Two dates are coming back - on one I need the time only. The First line of code for the full date works without fail - but the second line of code errors pointing to the format string but the strange part is that it errors on NULL values which does not use the format string and just returns Date.MinValue. When the second line gets data it formats the return correctly.
Dim dr As DataRow .TourDate = IIf(dr.IsNull("tourdate"), Date.MinValue, Format(dr("tourdate"), "MM/dd/yyyy")) .TourTime = IIf(dr.IsNull("tourtime"), Date.MinValue, Format(dr("tourtime"), "T"))
The error comes on the second line when dr("tourtime") is NULL - the erroe is: Argument 'Expression' is not a valid value.
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Jul 15, 2011
I am having trouble setting a datetime column in a datarow to null or MinValue and updating the database row using a DataAdapter update command.In one scenario, if the value in a text box is not a valid data, I set the value in the datarow = DateTime.MinValue. The value returned by MinValue is #12:00:00 AM#. An error is thrown on the Update command "SqlDateTime overflow.Must be between 1/1/1753 12:00:00 AM and 12/31/9999 11:59:59 PM."
In another scenario, an error is not thrown but the DateTime value on the row is not changed.The database column allows nulls and I can set the value to null using a SQL update command.
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Feb 24, 2012
I've been at this for an hour, but I can't seem to format a string as a percent while I am looping through a datatable. The string value that is being passed in is "3.22"
Public Function securityDt() As DataTable
Dim secMasterDt As New clsDataSecurity
Dim dt As New DataTable
dt = secMasterDt.getSecurityMasters()
For Each row As DataRow In dt.Rows
[Code] .....
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Sep 30, 2011
I am looping through the rows of a DataRowCollection and assigning the fields of each row to a variable. I always get "Input string was not in a correct format" no matter how I cast this. I just need gapCd to contain 0 if the field is null or the value otherwise. It seems the IsDbNull is not returning true properly. I've also tried DbNull.Value comparisons with no l
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Sep 6, 2010
i have a datatable in access with a column " Time " and i use it in a datagridview how can i format it to short time in dgv
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Feb 15, 2010
I need to get the datetime.now but i dont need the format.datetime.now=15/02/2010 16:22:22i need this format (20060731 21:59:42)
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Apr 26, 2011
For some reason i can not format the text of my date in a gridview
[Code]...
I still get this: May 10 2011 12:00AM I DID NOT SET MY FIELD TO DATETIME IN THE DATABASE...DOY
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Jun 2, 2010
I have the date format string dd-mm-yy. Please can you tell me how to add hours and minutes to the string (i.e 13-03-2010.21.03) ....
DateTime.Today.ToString("dd-mm-yy") ?
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May 12, 2009
I have a datetime for eg:23/9/2009 10:00:00 AM .I want to get date from datetime.Means 23/9/2009 .
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Feb 21, 2012
I have this date format yy/MM/dd HH:mm:ss ex: 12/02/21 10:56:09. The problem is, when i try to convert it to different format using this code: CDate("12/02/21 10:56:09").ToString("MMM. dd, yyyy HH:mm:ss") It displays Dec. 12, 2021 10:56:09. How can i correctly format it to: Feb. 21, 2012 10:56:09? This format is returned when i check balance inquiry fro my SMS based application.
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Feb 17, 2011
I have a data which is 06/03/2010 03:05:22 PM from foxpro database which I need to transfer to mysql database but I think mysql datetime only accept YYYY-MM-DD HH:MM:SS <am I correct?> I am prompted with an error 'Incorrect datetime value: '06/03/2010 03:05:22 PM' for column 'date_update' at row 1'. My question is how can I change the format so I can resolve that error. I'm using vb.net 201...
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Oct 14, 2010
I'm having a hard time trying to change the format a date time that comes from the atabase.I convert that to a string so i can split date and time into different values.Once i have that, i would like to format the time with the 24 Hour format, instead of the 12 Hour format that i'm getting.
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Oct 31, 2011
i'm having a problem converting a date to the right format. Below is the code I am using:
Dim getDate As DateTime
getDate = DateTime.Now
With cmdParent.Parameters
.Add("@date_created", OdbcType.DateTime).Value = getDate
.Add("@last_updated", OdbcType.DateTime).Value = getDate
[Code]...
This causes the following error: ERROR [HY000] [MySQL][ODBC 3.51 Driver][mysqld-5.5.8-enterprise-commercial-advanced]Incorrect datetime value: '' for column 'date_created' at row 1
This is being inserted in a MySQL db. The date_created column is of type datetime.
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May 10, 2010
I need to have my DateTime format match this type: 2010-04-10T10:00:03. When the user clicks the 'Update Modification Time' button, I need the exact Date and Time, in that format, to be saved in an .INI file.
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May 12, 2012
Why always get the wrong formatting although I've set it? I think the code is right but does not get the right result. I have:
[Code]...
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Apr 21, 2010
Need to convert a string to normal datetime format so it can be correctly inserted onto a datetime type field. String Format: 4/21/2010 4:43:03 PM Example: 2010-04-21 16:43:03.000 I have clarified question: The need is to change format and not type.
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Apr 19, 2012
I am building an appointment booking system web application in asp.net in VB,
Im simply trying to check whether an appointment has been made on a date selected from the calendar control. I am using Linq for the bindings but the format from the calendar is mmddyyyy when i need ddmmyyyy, my appointments entered int sql table as are 20/09/2012 10:00:00
trying to use a linq from p in db.apps
where p.date=mycontrol.selecteddate
[Code]......
im not sure if the code DateTime.Parse,,,, is right, there are many appoinments on the selected date which i select from the calendar but i think the DateTime format is not translating into SQL correctly
The appointment datatype in SQL is datetime
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Jun 21, 2011
i've been attempting to update a DateTime Field in a MySQL Table i've created via vb.net. I've made many attempts however i'm still getting the error that i have an error in my SQL Syntax. The format that the DateTime in Vb.net is 6/21/2011 12:46:25 PM. I need to convert that to the MySQL DateTime Format which is 2011-06-21 12:46:25 and also is running on a 24 hour clock. I've searched many forums and haven't found a conclusive solution yet. Below is the code i have so far, with attempting any DateTime Conversion.
Imports MySql.Data.MySqlClient
Public Class FinalFailedPinNumberAttempt
Dim connectionstring As String = "Server=localhost;user id=root;Password=;database=mylaundrycompany"
Dim SQLConnection As MySqlConnection = New MySqlConnection
[code]....
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May 8, 2011
i have a problem converting a datetime of a specific format , you may notice a colon in between the date and time.
Dim time As DateTime
Dim str As String = "26/02/2009:18:37:58"
time = DateTime.Parse(str, "dd/MM/yyyy:HH:mm:ss")
Console.WriteLine(time)
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Dec 1, 2011
i need to format my datetime picker with this format 2:34 AM/PM can anyone help me how to do.. i tried to find it in the properties yet wasn't there..or is this possible to maskedtext box? i tried it again.. with this format 00:00 AM/PM but i don't like the result because it allows me to input 99:99 AM/PM..
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Mar 23, 2010
I don't know if my SQL statement is wrong or what but basically I'm trying to select a record where a date column in SQL matches the value selected by the user in a date and time picker control. The format in SQL is IE: '2010-03-23 00:00:00:000'. The date and time picker shows me 'March-23-10'. How can I get it to match up with the way SQL holds it's dates and return a matching record? Is there some intellisense that pops up that
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Jul 28, 2011
Could someone please guide me on the correct format string to display a time in the following format? [code] Is there one format string I can use to accomplish this?
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Feb 14, 2012
I am going to create a directory using MkDir but I need the directory to be in this format:
Todays Date: 2/14/2012 I need it to say: 20122 (YearMonth)
So far here is my code. Any ideas on how I can get this accomplished?
Dim currentYearMonth As String = Dim currentYearMonth As String = DateTime.Now.ToShortDateString.Format("yyyymm")
MessageBox.Show(currentYearMonth)
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May 13, 2011
In my VB project I am returning an SQL datetime field to a date variable mdtCreated = CType(oReader("dtCreated"), Date) In an example it returns mdtCreated as #5/13/2011 2:59:43 PM# which is correct. Later on I want to show this as a string to dd/mm/yyyy format. I have tried mdtCreated.ToString("dd/mm/yyyy hh:mm:ss") But that returns "13/59/2011 02:59:43". I want it to return "13/05/2011 14:59:43" How can I achieve this?
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Jun 8, 2010
I wish to convert my string in format dd/mm/yyyy hh:mm:ss to a DateTime of the same format.
Dim ukCulture As System.Globalization.CultureInfo = New System.Globalization.CultureInfo("en-GB")
Dim myDateTime As DateTime
myDateTime = DateTime.ParseExact("18/05/2010 23:42:10, "dd/MM/yyyy HH:mm:ss", ukCulture)
When I step through this code the variable myDateTime is 05/18/2010 23:42:10 it appears that the dd/mm is the wrong way around and I cant work out how to correct this.
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Nov 11, 2010
I can't seem to be able to convert a string that contains date value of "100714 0700" (2010-07-14 7am) to a date format in vb.net 2005.
When I attempt to do:
Dim provider As Globalization.CultureInfo = Globalization.CultureInfo.InvariantCulture
strPickupDateTime = DateTime.ParseExact(txtPickupDate.Text, "yymmdd", provider)
I get back "1/14/2010 12:07:00 AM". How can I get a value of "2010-07-14 7:00"?
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Feb 23, 2011
Code:TimeTo_dtp.CustomFormat = "dd/MM/yyyy - HH:mm:ss"This works fine, but what I also want is for the the user to be able to select their time more precisely using miliseconds. After searching around I came across this web page:It has all the different formats on there. If you scroll down you will see format 'f' then format 'ff' then format 'fff', 'ffff', 'fffff', 'ffffff', 'fffffff.'What I am asking is how do I use that in my example?
I tried
Code:
TimeTo_dtp.CustomFormat = "dd/MM/yyyy - HH:mm:ss.fff"
[code]....
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Mar 9, 2010
It's been years since I've had to bother you with my silly questions but those had to do with VB 6. First of all, if I download the VS2010 Express edition will it replace all of my VS2008 edition, or will it be a separate entity. Also, the books I'm studying from are all 2008 -- will they still work on 2010?
[Code]...
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Nov 18, 2011
Is the default format of ToString dependent on anything server related? Here's the issue: I'm testing and have tested an application on my local machine and ToString(), by default, is returning in a format of "MM/dd/yyyy hh:mm:ss tt", however on our server it appears to be returning as "dd/MM/yyyy hh:mm:ss tt" which the consuming application is not expecting and causing errors.
Dim uvExpireDate = DateTime.Now.AddMinutes(1)
Dim token = String.Format(fmtString, uvExpireDate.ToUniversalTime().ToString(), [various other params])
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Dec 1, 2010
I have this example and it gives me exception "Conversion from string x to dateTime is invalid"
here is my method to validate Datetime. Example Date string : "27/03/1985"
Public Function validateDateColumn(ByRef FieldName As String) As Boolean
[Code]...
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