Difference Between Two Datetime?
Jun 23, 2011How 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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VS 2010 : DataColumn.Expression Which Calculates Difference Between Two DateTime Values?
Jan 13, 2011I have a DataTable with two DateTime columns: "start_time" and "end_time".Now, I want to add a third column that calculates the difference between the two DateTimes. But I can't seem to figure out how. I've tried to set the .Expression-value to "start_time - end_time", but it says that "-"-operator is not allowed on DateTime.
View 4 RepliesConvert String To Datetime & Calculate The Datetime?
Mar 23, 2011how to convert string to datetime and calculate date
View 3 RepliesMatch A Certain DateTime Value With Current System DateTime
May 7, 2010I'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.
View 1 RepliesMatch A Certain DateTime Value With The Current System DateTime?
May 1, 2010I'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.
Update Datetime Field With Empty Datetime?
Aug 8, 2011datetime1 and datetime2now two fields are have data ( date )in table recordi want to update only datetime2 is an emptyi am using visual basic 2010 ( visual studio 2010
View 1 RepliesC# - Compare Datetime.Now With A Datetime Variable
Dec 27, 2010I 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?
View 7 RepliesChallenge - DateTime Minus DateTime?
Mar 14, 2011Assume 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].....
VS 2010 Add Datetime Into Sql - Datetime - Field
Jan 29, 2011I'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?
Convert Iso Datetime To Est Datetime?
Oct 27, 2009How do I convert ISO datetime to locat EST with vb.net?
I have input time as e.g. "20091027T1639Z" which is ISO GMT.
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]
View 6 Replies.NET & SQL DateTime Search BETWEEN?
Sep 22, 2008I'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]...
.net - Finding Out The Datetime Value
Jun 7, 2011In 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]...
.net Before Date Is Less Than Datetime Now?
Jun 12, 2012the 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]...
C# - Using .net Datetime In Sql Query
Mar 31, 2010I 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)"
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?
View 2 RepliesDatetime Format In Dgv?
Sep 6, 2010i 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
View 8 RepliesDateTime In SQL Is Different Than Where Live
May 6, 2009My 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?
Datetime Selection In Dgv?
Sep 19, 2010here 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]...
DateTime.TryParseExact?
Mar 31, 2011Could someone tell me what is wrong with this code
Public Shared Function TestDateTime() As String
Dim Result As String = ""
Dim Test As DateTime
[code].....
Get A Value By Key Using DateTime.ToBinary
Oct 5, 2010I'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)..
Get Datetime With No Format?
Feb 15, 2010I 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)
View 10 RepliesHow To Convert To Datetime
Mar 30, 2009I 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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Jan 11, 2010In 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
Indicate The Lowest Datetime?
Nov 17, 2010is there something that can be called to indicate the lowest datetime possible?
View 3 RepliesUse Of DateTime Picker
Aug 28, 2009I 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.
Using Date Instead Of DateTime?
Apr 11, 2011From 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?
View 3 RepliesWhy Can Not Check If Datetime Is Nothing
May 3, 2011In 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.
.net - What Is The Difference Between = And :=
Apr 18, 2009I'm sure this is straightforward but I cannot find the correct string to get a google result. In VB.NET what is the difference between = (equals sign) and := (colon followed by equals sign)?
View 3 RepliesDifference Between Asp.net And C#?
Mar 30, 2011can anyone tell me book for VB.net for beginner and complee package of books important for VB. as i don't know anything abt VB.
what is difference between VB.net and asp.net and c#??
