Get the week number in year

[myra]

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]

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]

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]

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