Function Date.getFirstDateInWeek

Returns the date of monday in any given year and week

• Syntax Date Date.getFirstDateInWeek(Number year , Number week )
  
  This function will create a date object with the date set to the monday of the year and week provided. Numbers for week roll over meaning week 54 of 2008 is interpreted as week 1 of 2009. Negative numbers can be used as well.
• Parameters

  Number year

  The year

  Number week

  The week

• Return value A Date object set to the monday of the year and week specified.
• Examples

  To get the date of monday in week 23 of year 2003

  // Create date
  var d = Date.getFirstDateInWeek(2003,23);
  // Output is 'Monday 2nd of June 2003'
  d.toString():

• Related Date.format   
• Download
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  Source

  Unless otherwise noted all code in the JSLab Standard Library is licensed as GPLv3. See http://www.gnu.org/licenses/gpl.html for the entire license.

  This function has dependencies and will not work stand-alone. Use the download button above instead of copy/paste.

  // ************************************************************************** // Copyright 2007 - 2009 Tavs Dokkedahl // Contact: http://www.jslab.dk/contact.php // // This file is part of the JSLab Standard Library (JSL) Program. // // JSL is free software; you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation; either version 3 of the License, or // any later version. // // JSL is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with this program. If not, see <http://www.gnu.org/licenses/>. // *************************************************************************** // Return date of monday in any given week and year Date.getFirstDateInWeek = function (y,w) { // 4th of january is always in week 1 of any year var d = (new Date(y, 0, 4)).getISODay() - 1; return new Date(y, 0, 4 - d + (w - 1) * 7); };