Explain DateTime.Now Design In .Net

Sep 26, 2011

I have a question regarding the design of the Date object in the .Net framework, more specifically the Now property.I know that Now is a property that is a Date type. (This makes sense since I see the methods .AddHours(), AddYears(), etc) If Now being a class(or struct) how does it return a value directly.For example: How would I create a class or struct in C#/VB.net that would allow me to do the same without calling a property of Now?[code]To me it seems like you would have to call a another property off of TodaysWeather. But with the Datetime.Now example you don't.[code]

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Explain Difference Between Two Functions

Apr 29, 2009

I'm not new to coding but fairly new to Visual Basic.Can someone tell me the difference between using the System.IO.Directory.Whatever and the Me.Computer.FileSystem.Whatever functions when it comes to file and folder manipulations?

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Jun 6, 2011

Explain Singleton architecture of Remoting.

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Jul 1, 2009

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Nov 26, 2010

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How to arrange items in my webpage which support multiple resolution ...

Whatever the resolution of my monitor the controls in my webpage will display as it is as managed in 1024*768 reolution !

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Convert String To Datetime & Calculate The Datetime?

Mar 23, 2011

how to convert string to datetime and calculate date

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Match A Certain DateTime Value With Current System DateTime

May 7, 2010

I'm trying to match a certain DateTime value with the current system DateTime. I have a timer and a label on a form. Timer interval is set to 1000. When the form loads, the timer starts ticking. As soon as the current DateTime matches the value of the variable, it shows a message in the label. When I'm writing the following code, the values don't match even if the current system DateTime is equal to the variable. Label1 isn't showing 'Times Matched':[code]The default format of 'Now' is the same as I have stored in dtmVar variable. So there's no question of format mismatch. Does that mean 'Now' is not actually a DateTime property? Provided, my O.S. is Windows Vista Ultimate and all date/time settings are set to default.

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Match A Certain DateTime Value With The Current System DateTime?

May 1, 2010

I'm trying to match a certain DateTime value with the current system DateTime. I have a timer and a label on a form. Timer interval is set to 1000. When the form loads, the timer starts ticking. As soon as the current DateTime matches the value of the variable, it shows a message in the label.

When I'm writing the following code, the values don't match even if the current system DateTime is equal to the variable. Label1 isn't showing 'Times Matched':

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Dim dtmNow As DateTime

[Code]....

Why is it so? The default format of 'Now' is the same as I have stored in dtmVar variable. So there's no question of format mismatch. Does that mean 'Now' is not actually a DateTime property? Provided, my O.S. is Windows Vista Ultimate and all date/time settings are set to default.

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Update Datetime Field With Empty Datetime?

Aug 8, 2011

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Jun 27, 2011

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May 25, 2011

I searched codeplex and google. I have found so many such as tustena but unfortunately they are not domain driven based and in these solutions I could not find a good modelling documents or references. i am a newbie in CRM but I am sensetive to design it with solid object-oriented fundamentals. Any reference or open source solution especifically for CRM design and implementaion in .NET? Cheers

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C# - Compare Datetime.Now With A Datetime Variable

Dec 27, 2010

I try to compare Datetime.Now with a Datetime variable I set, using the Datetime.CompareTo() method. I use a timer to compare these every second and display the result, but as the current time approaches the time I set, the result changes from 1 to -1, but never 0, which means these two are never equal. I'm suspecting the Datetime structure contains milliseconds?

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Challenge - DateTime Minus DateTime?

Mar 14, 2011

Assume the following program is started at 1:59:01 AM on 3/13/2011 in the United States. The first time Timer1 ticks what will be the value of the TimeSpan (ts)?

Public Class Form1
Private Sub Timer1_Tick(sender As System.Object, _
e As System.EventArgs) Handles Timer1.Tick

[code].....

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VS 2010 Add Datetime Into Sql - Datetime - Field

Jan 29, 2011

I'm trying to add the date and time of Today into a Sql-database-field that has the datetype datetime.

[Code]...

the msgbox gives me the following result: 29/01/2011 18:49:21 my sqlException gives me the following error: 102 - Incorrect syntax near '18'. Is it better that i set the datatype to char in my sql database? It's maybe a bit easier? When I do that, can I calculate with these date?

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Convert Iso Datetime To Est Datetime?

Oct 27, 2009

How do I convert ISO datetime to locat EST with vb.net?

I have input time as e.g. "20091027T1639Z" which is ISO GMT.

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Conversion Of A Character Data Type To A Datetime Data Type Resulted In Out-of-range Datetime Value

Jan 12, 2010

[code] "The conversion of a char data type to a datetime data type resulted in an out-of-range datetime value.The statement has been terminated." [code]

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.NET & SQL DateTime Search BETWEEN?

Sep 22, 2008

I'm using VB .NET & SQL Express 2005.I was hoping someone could help me figure this out, I'm trying to search a table between two dates. The table has a datetime column and I am using VS .NET 2005 DateTimePicker control. I'm not getting any errors, but I'm not getting any results either..

[Code]...

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.net - Finding Out The Datetime Value

Jun 7, 2011

In my vb.net winform application, I am moving the file from one folder to another. I need to store the datetimevalue when the transfer has been done. Later I need to show this DateTime value in my Grid. Here is the code i have written, but not able to store the datetime value.

[Code]...

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.net Before Date Is Less Than Datetime Now?

Jun 12, 2012

the last date was saved on database is: 6/13/2012 12:27:30 PM

In my DateTime Now is:6/13/2012 01:27:57 AM

but, when I execute this function, it always say:"Date has been manually modified, Please Set to Valid DateTime" But, DateTime Now is NOT lessthan the Date from my Database. What's wrong?

This is the code, please correct it,

[Code]...

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C# - Using .net Datetime In Sql Query

Mar 31, 2010

I have a DateTime object I want to compare against an sql datetime field in a where clause. I'm currently using:

"where (convert( dateTime, '" & datetimeVariable.ToString & "',103) <= DatetimeField)"

But I believe datetimeVariable.ToString will return a different value depending on the culture where the system is running.

How would you handle this so it is culture independent?

EDIT : I won't be using paramatised sql in this code...

EDIT : following Parmesan's comment to one of the answers looks like the best method may be:

"where (convert( dateTime, '" & datetimeVariable.ToString( "s" ) & "',126) <= DatetimeField)"

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Compare Datetime Between Sql And Vb

Mar 2, 2012

[Code]in my program, i've created a function wherein i will get the min timeentry for type 0 and it depends on the current date. so heres how it goes [Code] what should i put as the value of time entry? i tried format(var,"m") but no success. in the code i post above it also does not work. i get this error "The conversion of a varchar data type to a datetime data type resulted in an out-of-range value." how can i match the value in the database and the current date so that i can retrieve a value?

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Datetime Format In Dgv?

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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May 6, 2009

My SQL server is running from the west coast and I live in the east coast, I am running a VB.NET code and to check for items within the right time I have to use  DateTime.Now.AddHours(-3).

Now thinking about it, when the daylight savings happen, it will only be  DateTime.Now.AddHours(-2), how do I go about fixing that from now? Is there a way to fix that?

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Datetime Selection In Dgv?

Sep 19, 2010

here i;m trying to select a date and time but i'm having problems can you see what i'm doing wrong Dim table = mydataset.Tables("Bookingen")

[Code]...

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DateTime.TryParseExact?

Mar 31, 2011

Could someone tell me what is wrong with this code

Public Shared Function TestDateTime() As String
Dim Result As String = ""
Dim Test As DateTime

[code].....

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Difference Between Two Datetime?

Jun 23, 2011

How can I get the difference of this two Date time.

(6/21/2011 7:02:53 AM) subtract by (6/21/2011 4:00:00 AM)

the answer should be ---> 03:02:53

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Get A Value By Key Using DateTime.ToBinary

Oct 5, 2010

I've hit a snag in one of my apps and I could code it differently so it would work, but I'd rather figure out why its not working as is.

If you add a watch in VS to dtDate.Tobinary and lDateInBinary you will see they do not hold the same number; however, it evaluates as true.

Dim dtDate as new DateTime(2010, 10, 5, 0, 0, 0, DateTimeKind.Local)
Dim lDateInBinary as Long = dtDate.toBinary()
If dtDate.toBinary() = lDateInBinary then
'Hits
Else
'Doesn't Hit
End If

Here it shows two longs that are very different as being equivalent. In my particular problem, I have a dictionary who's key is a Long and when I try to get a value by key using DateTime.ToBinary it doesn't find the a matching key since the numbers are different.

Why are these numbers different? Why do they evaluate to be the same? They are both within the bounds of the min/max of a Long, unless I'm overlooking something (it's been a long day)..

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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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Mar 30, 2009

I have a dropdownlist that displays time only.Like 8:00AM,8:30AM............When i save this time to database i want to save as todays date + time.eg:8:00AM as 03/30/2009 8:00:00:000.

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How To Determine If DateTime Is Not Set

Jan 11, 2010

In VB6 if I wanted to see if a datetime field wasn't set, I could do something like if myDate = 0 then. I tried that with VB.NET and it can't compare to an integer. How do we do this now? I found the Ticks property, so if myDate.Ticks = 0 does seem to work, but I'm not sure if that's the "right" way to do it. None of the other things I've tried have been successful.

Dim dt As New DateTime
If dt.Ticks = 0 Then MsgBox("dt.Ticks = 0") 'this fires
If IsDBNull(dt) Then MsgBox("IsDBNull(dt)") 'doesn't fire, so no good
If Not IsDate(dt) Then MsgBox("Not IsDate(dt)") 'doesn't fire, so no good
'If dt Is Nothing Then MsgBox("dt is nothing") 'not legal syntax

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Nov 17, 2010

is there something that can be called to indicate the lowest datetime possible?

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Aug 28, 2009

I am working on Search of records from Database between range of two dates. I implemented it with two textboxes for StartDate and EndDate and it is working fine.Now i want to attach Calender to the textboxes so that user may not have to type the dates instead user may just select the Startdate and Enddate from two Calenders.I tried with adding two DateTimePicker and used following code:[code]I have two queries:

1) DateTimePicker desplays date and time in the Textbox, I want that only Date is displayed in the Textbox.

2) How i can attach DateTimePicker directly to Texbox so that on runtime when i select a date from DateTimePicker it should immediately display in Textbox.

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Apr 11, 2011

From what I can tell Date and DateTime have the same functionality. Is there a reason why I would want to use one instead of the other?

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Why Can Not Check If Datetime Is Nothing

May 3, 2011

In vb.net, is there a way to set a datetime variable to "not set". And why is it allowed to set a date to Nothing and NOT allowed to check if it is Nothing, like this:

Dim d As DateTime = Nothing
Dim boolNotSet As Boolean = d Is Nothing

This throws an error with this description:

'Is' operator does not accept operands of type 'Date'. Operands must be reference or nullable types.

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Dec 11, 2009

We have a DateTime Service that pulls the Database date down when we need to use a Date. Now, If I want to run a test using "Todays" Date using FitNesse, What would be the easiest way of creating a way to have (OurService).CurrentDate be static? We have a control that ads Days,Years, or Months to the current date.. and I would like to be able to test this.

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Asp.net - Can't Format Datetime Using Dataformatstring

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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Mar 11, 2009

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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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Jul 30, 2009

I have a Session variable in which i have stored one date '22/7/2009'.Now i want to convert value in session to datetime. I tried folowing code:

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Apr 1, 2009

Duplicate: How to truncate a date in .net? I have datetime field containing '4/1/2009 8:00:00AM'. I want to get '4/1/2009' without the time.

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Nov 17, 2010

I am a c#/asp.net developer and I am having to work on a VB/asp.net. I have two variables

Dim originalDate as DateTime?
Dim newDate as DateTime?

Both nullable datetimes, originalDate is a nullable date I am getting from the database and newDate time is set in code, I need to compare them, they can either both have dates, neither have dates or one have and one not.

I have a bit of code as follows:

if origEndDate = origEndDate then

When both origEndDate and origEndDate are "nothing" this statement is false (well when I run it in the watch window it comes back as nothing)!I don't understand why this is the case because I was under the impression doing an "=" compares the two values and as they are the same surely it should be true? What syntax should I be using as in C# I can do the above as so:

if (origEndDate == origEndDate) { }

and it will come back as true.

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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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Aug 17, 2010

I have two tables TimeSheet and TimeRecord. TimeRecord has Foreign Key TimeSheetId of TimeSheet. The following time-logs are from TimeRecord[code]...

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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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