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Get the week number in year

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44586 May 28,2006 11:51 AM UTC Jun 2,2006 10:43 AM UTC Windows Forms 3
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Tags: FAQ
myra
Asked On May 28, 2006 11:51 AM UTC

hi, I want to know if there is a function that returns the number of a week in a certain year. for example: The week (from 24 june 2006 Till 30 june 2006) is the week #26 of the year 2006

Joy K George [Syncfusion]
Replied On May 29, 2006 09:48 AM UTC

Hi Myra, Import the namespace System.Globalization and try the following code snippet. private void Button1_Click(object sender, EventArgs e){ CultureInfo myCI = new CultureInfo("en-US"); Calendar myCal = myCI.Calendar; // Gets the DTFI properties required by GetWeekOfYear. CalendarWeekRule myCWR = myCI.DateTimeFormat.CalendarWeekRule; DayOfWeek myFirstDOW = myCI.DateTimeFormat.FirstDayOfWeek; // Displays the number of the current week relative to the beginning of the year. Console.WriteLine("The CalendarWeekRule used for the en-US culture is {0}.", myCWR); Console.WriteLine("The FirstDayOfWeek used for the en-US culture is {0}.", myFirstDOW); Console.WriteLine("Therefore, the current week is Week {0} of the current year.", myCal.GetWeekOfYear(DateTime.Now, myCWR, myFirstDOW)); } Regards, Joy

Myra
Replied On June 1, 2006 01:40 PM UTC

thanks joy!great!maybe u can help me doing the opposite work: function that gives the start and end day of a week number: so if I choose the first week of the year 2006, it will give me: 31/12/2006 --> 06/01/2006 if the week begins on saturday regards, Myra

Joy K George [Syncfusion]
Replied On June 2, 2006 10:43 AM UTC

Hi Myra, If my understanding about your requirement is right you could achieve using the below code. int week = int.Parse(textBox1.Text); int year = int.Parse(textBox2.Text); DateTime dt = new DateTime(year, 1, 1); dt=dt.AddDays(week * 7); //it will add days to the starting date (eg 1/1/2006) MessageBox.Show(dt.ToString()); Regards, Joy

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