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Php > Date Time Code Examples

Function get_week_number which returns the week number of the given

Function get_week_number which returns the week number of the given
date according to ISO 8601-1988

<?php 

function is_leap_year($year) { 
        if ((($year % 4) == 0 and ($year % 100)!=0) or ($year % 400)==0) { 
                return 1; 
        } else { 
                return 0; 
        } 
} 

/* 
#define ISO_WEEK_START_WDAY 1 // Monday 
#define ISO_WEEK1_WDAY 4 // Thursday 
#define YDAY_MINIMUM (-366) 
  int big_enough_multiple_of_7 = (-YDAY_MINIMUM / 7 + 2) * 7; 
  return (yday 
          - (yday - wday + ISO_WEEK1_WDAY + big_enough_multiple_of_7) % 7 
          + ISO_WEEK1_WDAY - ISO_WEEK_START_WDAY); 
*/ 

function iso_week_days($yday, $wday) { 
        return $yday - (($yday - $wday + 382) % 7) + 3; 
} 

function get_week_number($timestamp) { 

        $d = getdate($timestamp); 

        $days = iso_week_days($d[ "yday"], $d[ "wday"]); 

        if ($days < 0) { 
                $d[ "yday"] += 365 + is_leap_year(--$d[ "year"]); 
                $days = iso_week_days($d[ "yday"], $d[ "wday"]); 
        } else { 
                $d[ "yday"] -= 365 + is_leap_year($d[ "year"]); 
                $d2 = iso_week_days($d[ "yday"], $d[ "wday"]); 
                if (0 <= $d2) { 
                        /* $d["year"]++; */ 
                        $days = $d2; 
                } 
        } 

        return (int)($days / 7) + 1; 
} 
?>

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