note 51934 added to function.mktime

With response to Robert Christiaanse's Delphi related convertion to find the day in the week of a year, here is my solution The original purpose of this function was to return the "first day of the week" for a timesheet application. Since PHP defaults to Monday as the start of the week, and the need for my app to have Sunday as the start of the week, I had to pass the day as an argument. So if you call the function like: find_first_day_ofweek(16, 2005, 'sunday'); it would return the unix timestamp of the Sunday in week 16 of 2005. <?php /** * Function to find the day of a week in a year * @param integer $week The week number of the year * @param integer $year The year of the week we need to calculate on * @param string $start_of_week The start day of the week you want returned * Monday is the default Start Day of the Week in PHP. For * example you might want to get the date for the Sunday of wk 22 * @return integer The unix timestamp of the date is returned */ function find_first_day_ofweek($week, $year, $start_of_week='sunday') { // Get the target week of the year with reference to the starting day of // the year $target_week = strtotime("$week week", strtotime("1 January $year")); // Get the date information for the day in question which // is "n" number of weeks from the start of the year $date_info = getdate($target_week); // Get the day of the week (integer value) $day_of_week = $date_info['wday']; // Make an adjustment for the start day of the week because in PHP the // start day of the week is Monday switch (strtolower($start_of_week)) { case 'sunday': $adjusted_date = $day_of_week; break; case 'monday': $adjusted_date = $day_of_week-1; break; case 'tuesday': $adjusted_date = $day_of_week-2; break; case 'wednesday': $adjusted_date = $day_of_week-3; break; case 'thursday': $adjusted_date = $day_of_week-4; break; case 'friday': $adjusted_date = $day_of_week-5; break; case 'saturday': $adjusted_date = $day_of_week-6; break; default: $adjusted_date = $day_of_week-1; break; } // Get the first day of the weekday requested $first_day = strtotime("-$adjusted_date day",$target_week); //return date('l dS of F Y h:i:s A', $first_day); return $first_day; } ?> ---- Manual Page -- http://www.php.net/manual/en/function.mktime.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+51934 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+51934&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+51934&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+51934&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+51934&report=yes&reason=useless Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+51934&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+51934&report=yes Search -- http://master.php.net/manage/user-notes.php