Datetime - Finding The Date Of Monday In A Week?

Nov 10, 2009

I need to find a way to find the date (DD/MM/YYYY) of the Monday for any week we're on.

For example, for this week, monday would be 09/11/2009, and if this were next week it'd be 16/11/2009.

I managed to get somewhere in the forms of code, but all I got was 'cannot convert to Integer' errors. I was using Date.Today and AddDays().


Find Date Of Monday Week Programmatically.

Nov 10, 2009

I need to find the date of Monday this week programmatically.For example, for this week Monday was on the 9th, so the date I need is: 09/11/2009.And when we roll over to next week it needs to calculate: 16/11/2009..I have tried doing this myself but I can't see how to do the arithmetic.

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Sep 14, 2011

I am working on a code where I need to add 21 years to the date 02/15/1957 and have it display the week day of that year. I have been looking at different web sites for visual basic

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Specifying Monday As The First Day Of Week In The DateDiff Function?

Dec 21, 2011

I had some trouble specifying Monday as the first day of week in the DateDiff function.

The following syntax does not work: Dim myWeekNumber as Int32 = DateDiff("ww",date1,date2,2)

Compiler Error Message: BC30519: Overload resolution failed because no accessible 'DateDiff' can be called without a narrowing conversion

However, using the enumeration value (FirstDayOfWeek.Monday) instead of the value (2) does work. I wonder why.

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Jun 1, 2010

I have a two buttons: Previous Week & Next Week When i run the app the LabelDate needs to shows up "May 31, 2010 - June 6, 2010" When i click a previous week button i want to set LabelDate's text to "May 24, 2010 - May 30, 2010" If i click Next Week button i want it shows up "June 7, 2010 - June 13, 2010" Means it should always display previous/next week starting from Monday and ending with Sunday.

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Uninitialised DateTime Struct Tell Me It's Monday?

Sep 20, 2010

I have a DateTime struct I use, and sombody commented out the part where it was created (but not declared) When I was using it, myDate.DayOfWeek == DayOfWeek.Monday returned true.

If the part where it is created is commented out, how can it tell me it's monday, instead of throwing some exception?

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Calculate The Start And End Date Of A Week Given The Week Number And Year In C# (based On The ISO Specification)?

Aug 4, 2009

I need to generate a report that shows the 52 weeks of a year (or 53 weeks as some years have) and their start and end dates. There is an ISO spec to do this but seems awfully complicated! Im hoping someone knows of a way to do it in C# or Visual Basic (its actually for Visual Basic 6 but I will try port it across)

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Mar 15, 2011

Ok so i'm working on this project that requires me to imput a month and year which then will output the number of days in the selected month for you to select from, then determines what day of the week it is. The problem i'm having is that I cant get the month to the converted value that I need for it to work .  Example: January will be the 13th month and february as the 14th of the previous year. Heres what i have so far if it helps. Aslo the code that I have to use to find the day of the week only works when the total is divided by 7, and then the value of the remainder is the day of the week with saturday =0, sunday=1, monday=2, and so on.


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May 10, 2009

A month consistof weeks and i want to find out which week of the current month.

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I am writing a personal accountant software using VB2010. What I'm looking for now is to get the week date range of a specific date (Monday to Sunday). For example, if the given date is 16/03/2012, I want to get back:12/03/2012 -> 18/03/2012

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Jun 1, 2011

I need a function that will give me the day of the week for any date...and possible assign the day of the week to a string...

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Dec 13, 2011

I'm having some trouble getting the first day of the current week, then getting the date of that day.

Public NotInheritable Class FirstDayOfWeekUtility
Private Sub New()
End Sub


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.net - Finding Out The Datetime Value

Jun 7, 2011

In my 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.


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Mar 21, 2010

is there any ready to go solution within the microsoft framework, regarding conversion of date to day?For example, i would like to convert this string 21/03/2010 (dd/mm/yyyy) to Sunday?

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C# - Convert Calendar-week To Date?

Jan 20, 2011

is there a simple builtin function that i could use to get a date instance from a calendarweek/year-combination?

It should be possible to enter 10w2005 into a TextBox and i'll create the date 07 March 2005 from it.

Monday should be first day and CalendarWeekRule should be FirstFullWeek.

My first approach was:

Dim w As Int32 = 10
Dim y As Int32 = 2005
Dim d As New Date(y, 1, 1)


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Mar 31, 2011

I want to convert =now date value and i want to change that to the day of the week (eg. Friday). I need to do this to compare it with which day it is today.

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May 12, 2011

lets say i have a string that holds "Monday" and another string that holds "9:45:00 PM". would it be possible to look at the Date.Now() function and see when the next Monday is, and then convert those two strings into a date? lets say the next monday was 05/20/2011. I would want the date variable to hold "05/20/2011 9:45:00 PM". any ideas guys?

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May 26, 2009

VB2008 - I need to display in 2 textboxes the first date in the week and the last date of the week when a user clicks any day within the calendar week using the MonthCalendar control. I have been messing with it and was able to return the integer values but not the date

Private Function GetLastDay(ByVal d As Date) As Date
Return d.AddDays(7 - d.DayOfWeek)
End Function
Private Sub MonthCalendar1_DateSelected(ByVal sender As Object, ByVal e As System.Windows.Forms.DateRangeEventArgs) Handles MonthCalendar1.DateSelected
[Code] .....

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Get A Date Based Off A Week Number?

Jun 3, 2010

Given a week number, I need to get the date of the Monday of that week.For example, I have several strings that are stored in a file, such as

"WK 28 2010"
"WK 30 2010"

They could be any any valid week number.

The Monday on Week 28 of the year is 12 July 2010
The Monday on Week 30 of the year is 26 July 2010
Its these dates that I need.

I guess I could create a lookup table, but would prefer a more smarter approach so my software will be future compatible?

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Jun 29, 2011

I am developing an ASPX VB.NET file. My assignment is to convert an integer representing week of the year into that end date. For example, if user selects Week 4 for 2011, I want to get date = 1/22/11. How do I do this in VB.NET?

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Jun 19, 2009

I have two tables: a schedule table that contains information about how an employee is scheduled and a numbers table in which each number corresponds to a date.


I can do this on the SQL side or the code side. I have Linq at my disposal if I need it. The table doesn't need to be compiled by SQL. This will happen dynamically on a website and should be as efficient as possible.I don't want to have to iterate through each and look for breaks in contiguous days if I don't have to.

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Feb 22, 2010

I have two datetimepicker controls now when I select February 22, 2010 from datetimepicker1 which is Monday I want the other datetimepicker2 to be February 25, 2010 which is Thursday. This means that I want datepicker2 to automatically look for the Thursday value of the week. I have set my week start day as Saturday and ends on Thursday, Friday is holiday.

Datetimpicker1       Datetimepicker2
02/20/2010             02/25/2010            
02/21/2010             02/25/2010
02/25/2010             02/25/2010

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May 16, 2009

Is it possible to calculate the currently selected date in a month calculator?I need to be able to produce a number between 1 and 5 for the currently selected week.

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Jan 22, 2010

I m working on a site which requires me to calculate date(s) from the given week number for the year start set by the user in his setup.for ex. user set the year is from 1st April to 31st May in his setup and he selects week say 23rd then I have to find out dates for the week selected. 

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Apr 2, 2009

How can I find the date of the Sunday of the first full week of a year using the DatePart function or something else? Jan 4 for 2009.

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Feb 2, 2011

I am in a VB 2010 class right now, and I'm suppose to write a program that requests the user's date of birth and then display the day of the week (such as Sunday, Monday, ect...) on which day they will have or had their 21st. Birthday.

I already have the GUI made up with a MaskedTextBox set to simple date and it is named = mtbDayOfBirth
I also have the button already to calculate this, and a read only text box named = txtBox2.

My code so far is:
Private Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim d As Date = CDate(mtbDateOfBirth.Text)
txtBox2.Text =
End Sub
End Class

The only thing in my book only talks about how to pull the number of days from your bday or pull the full birthday as like the 04/06/1992 would return Monday, April 06, 1992.

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C# - Group By Week Of Year (Week Number) In Linq To SQL

Aug 6, 2010

In regular SQL i could do something like


How can i do that in Linq to SQL ?

The following don't work

From F In DB.T Group R By DatePart(DateInterval.WeekOfYear, F.Date)

Also don't work:

From F In DB.T Group R By (F.Date.DayOfYear / 7)

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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,


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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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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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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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Jul 2, 2010

I want to insert only date into the db but in the following statement that I've wrote which inserts the date in mm-dd-yyyy hh:mm:ss format.

InsertCmd = "Insert into Blotter (Name, Product, Date_Time) values ('" & NameLabel.Text.Trim() & "','" & ProductTextBox.Text.Trim() & "','" & TimeLabel.Text.Trim() & "')" & "Update Blotter Set Name = UPPER(Name)"

I have tried the following code, however it didn't work.

InsertCmd = "Insert into Blotter (Name, Product, Date_Time) values ('" & NameLabel.Text.Trim() & "','" & ProductTextBox.Text.Trim() & "','" & (CDate(TimeLabel.Text.Trim().ToString("MM/dd/yyyy")))& "')" & "Update Blotter Set Name = UPPER(Name)"

I also tried format the TimeLabel as below but still didn't work. [code] TimeLabel.Text = CDate(DateTime.Now).ToString("MM/dd/yyy")

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Apr 5, 2011

I'm pulling into a variable a datetime value. Now, I want to post this value back to my database, but I need it to be only the year digits. How do I get VB.NET to trim the month, day, and time off and just return the four character year (e.g. 2011)?

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Sep 22, 2010

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Jun 22, 2010

How to retrieve only date from DateTime in in dd/MM/yyyy format and I have a field in table in access 2007 which has date/time datatype. Data is stored in datetime format.(04/08/2010 12:01:07 AM) I want to retrive only dates which are in range of two DTPickers in dd/MM/yyyy format [Code]

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Dec 6, 2010

why is it that we have a date and a datetime which are exactly the same thing, and is it preferred to use new Date or new DateTime?

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Nov 27, 2009

how can i set the DateTime object to the date i want? dim DT as DateTime

DT.Date="2/2/2004 12:00:05"

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Aug 11, 2011

I have written XML file having a Date <Date>10/11/2011</Date> tag in it as above and trying to read it from VB.NET:

If TypeOf item Is DateTime Then
nextItem = DirectCast(item, DateTime).ToString("MMM-d-yyyy hh:mm:ss.fff", ci)
End If

How to get the date tag in XML in datetime format in the application? (As I am getting the date value as string in the application)

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Feb 22, 2010

similiar question to the one asked before by someone, about age and date.

I have 2 fields in sql server 2008
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Dec 30, 2011

I have a sql query which extract a field of datatype smalldatetime. I read this field using datareader, convert it to string and store it in a string variable.I get the string as 1/1/2012 12:00:00 AM ,here i want to use only date part of this string and i have nothing to do with the time.How can i cut only the date from the string and get the output as 1/1/2012?

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