function date_dow in Date 6.2

Same name and namespace in other branches

1. 5.2 date_php4/date_php4.inc \date_dow()
2. 6 date_php4/date_php4.inc \date_dow()

Returns day of week for given date (0 = Sunday), works on dates outside normal date range.

Adapted from a function in the ADODB date library by John Lim, more info in date_php4_lib.inc.

Parameters

int $day:

int $month:

int $year:

Return value

the number of the day in the week

14 calls to date_dow()

date_calc_begin_of_week in date_php4/date_php4_calc.inc

Find the month day of the beginning of week for given date, using variable_get('date_first_day', 1). Can return weekday of prev month.

date_calc_end_of_week in date_php4/date_php4_calc.inc

Find the month day of the end of week for given date, using variable_get('date_first_day', 1). Can return weekday of following month.

date_calc_first_of_month_weekday in date_php4/date_php4_calc.inc

Find the day of the week for the first of the month of given date

date_calc_format in date_php4/date_php4_calc.inc

Formats the date in the given format, much like strfmt()

date_calc_get_weekday_abbrname in date_php4/date_php4_calc.inc

Returns the abbreviated weekday name for the given date.

... See full list

File

date_php4/date_php4.inc, line 1027

Code

function date_dow($day, $month, $year) {

  // Gregorian correction from ADODB
  if ($year <= 1582) {
    if ($year < 1582 || $year == 1582 && ($month < 10 || $month == 10 && $day < 15)) {
      $greg_correction = 3;
    }
    else {
      $greg_correction = 0;
    }
  }
  else {
    $greg_correction = 0;
  }
  if ($month > 2) {
    $month -= 2;
  }
  else {
    $month += 10;
    $year--;
  }
  $day = floor((13 * $month - 1) / 5) + $day + $year % 100 + floor($year % 100 / 4) + floor($year / 100 / 4) - 2 * floor($year / 100) + 77 + $greg_correction;
  $weekday_number = $day - 7 * floor($day / 7);
  return $weekday_number;
}