protected function yToJd($year)
    {
        $div19 = (int) (($year - 1) / 19);
        $mod19 = ($year - 1) % 19;

        $months      = 235 * $div19 + 12 * $mod19 + (int) ((7 * $mod19 + 1) / 19);
        $parts       = 204 + 793 * ($months % 1080);
        $hours       = 5 + 12 * $months + 793 * (int) ($months / 1080) + (int) ($parts / 1080);
        $conjunction = 1080 * ($hours % 24) + ($parts % 1080);
        $julian_day  = 1 + 29 * $months + (int) ($hours / 24);

        if ($conjunction >= 19440 ||
            $julian_day % 7 === 2 && $conjunction >= 9924 && !$this->isLeapYear($year) ||
            $julian_day % 7 === 1 && $conjunction >= 16789 && $this->isLeapYear($year - 1)
        ) {
            $julian_day++;
        }

        // The actual year start depends on the day of the week
        return $julian_day + self::$ROSH_HASHANAH[$julian_day % 7];
    }
protected function yToJd($year)
    {
        $div19 = (int) (($year - 1) / 19);
        $mod19 = ($year - 1) % 19;

        $months      = 235 * $div19 + 12 * $mod19 + (int) ((7 * $mod19 + 1) / 19);
        $parts       = 204 + 793 * ($months % 1080);
        $hours       = 5 + 12 * $months + 793 * (int) ($months / 1080) + (int) ($parts / 1080);
        $conjunction = 1080 * ($hours % 24) + ($parts % 1080);
        $julian_day  = 1 + 29 * $months + (int) ($hours / 24);

        if ($conjunction >= 19440 ||
            $julian_day % 7 === 2 && $conjunction >= 9924 && !$this->isLeapYear($year) ||
            $julian_day % 7 === 1 && $conjunction >= 16789 && $this->isLeapYear($year - 1)
        ) {
            $julian_day++;
        }

        // The actual year start depends on the day of the week
        return $julian_day + self::$ROSH_HASHANAH[$julian_day % 7];
    }
protected function yToJd ( $ year ) { $ div19 = ( int ) ( ( $ year - 1 ) / 19 ) ; $ mod19 = ( $ year - 1 ) % 19 ; $ months = 235 * $ div19 + 12 * $ mod19 + ( int ) ( ( 7 * $ mod19 + 1 ) / 19 ) ; $ parts = 204 + 793 * ( $ months % 1080 ) ; $ hours = 5 + 12 * $ months + 793 * ( int ) ( $ months / 1080 ) + ( int ) ( $ parts / 1080 ) ; $ conjunction = 1080 * ( $ hours % 24 ) + ( $ parts % 1080 ) ; $ julian_day = 1 + 29 * $ months + ( int ) ( $ hours / 24 ) ; if ( $ conjunction >= 19440 || $ julian_day % 7 === 2 && $ conjunction >= 9924 && ! $ this -> isLeapYear ( $ year ) || $ julian_day % 7 === 1 && $ conjunction >= 16789 && $ this -> isLeapYear ( $ year - 1 ) ) { $ julian_day ++ ; } // The actual year start depends on the day of the week return $ julian_day + self :: $ ROSH_HASHANAH [ $ julian_day % 7 ] ; }
Calculate the Julian Day number of the first day in a year.

@param int $year

@return int
Calculate the Julian Day number of the first day in a year .