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phpでタイムゾーンの"日の出/日没"時間、"時間差"を取得

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DateTimeDateTimeZone 関数が便利だし、ソースコードが少しエレガントになった気がしてくるから、これから積極的に使っていきたい!

TimeZone関連の2つの関数を作ってみた。1つは2つのタイムゾーンの時間差を返す関数。もう1つは特定のタイムゾーンの”日の出”と”日没"の時間を現地でデフォルトタイムゾーンの時間で返す関数です。

phpがサポートしているタイムゾーンの一覧はここで確認できる。
http://www.php.net/manual/ja/timezones.php

###2つのタイムゾーンの時間差を取得
/**
*
* @param string $timezoneName1
* @param string $timezoneName2
* @return array
*/
function getTimezoneTimeDifference($timezoneName1, $timezoneName2 = null) {
$timezone1 = new DateTimeZone($timezoneName1);
$timezone2 = new DateTimeZone($timezoneName2);

    $date1 = new DateTime("now", $timezone1);
    $date2 = new DateTime("now", $timezone2);

    $offset = $timezone1->getOffset($date1) - $timezone2->getOffset($date2);
    $hour   = floor($offset / 3600);
    $minute = ($offset - ($hour * 3600)) / 60;

    return array(
        'time'   => $hour.':'.$minute,
        'offset' => $offset);
}

echo "TimeDifference: " . $diff['time'];
$diff = getTimezoneTimeDifference('Asia/Tokyo', 'Europe/Stockholm');
echo $diff['time'] . "<br />";

// Output  
// TimeDifference: 8:0;

* *
###タイムソーンの”日の出”と”日没"の時間を現地でデフォルトタイムゾーンの時間で取得
/**
*
* @param string $timezoneName
* @param string $localTime
* @param string $format
* @return array
*/
function getSunTime($timezoneName, $localTime = false, $format = "H:i")
{
$timezone = new DateTimeZone($timezoneName);
$location = $timezone->getLocation();

    $sunrise = date_sunrise(time(), SUNFUNCS_RET_TIMESTAMP, 
                            $location['latitude'], $location['longitude']);
    $sunset  = date_sunset(time(), SUNFUNCS_RET_TIMESTAMP, 
                           $location['latitude'], $location['longitude']);

    if ($localTime == true) {
        $diff = getTimezoneTimeDifference(date_default_timezone_get(), $timezoneName);
        $sunrise += $diff['offset'];
        $sunset  += $diff['offset'];
    }

    $date1 = new DateTime("now", $timezone);
    $sunrise = $date1->setTimestamp($sunrise)->format($format);
    $sunset  = $date1->setTimestamp($sunset)->format($format);

    return array(
        'sunrise' => $sunrise,
        'sunset'  => $sunset
    );
}

date_default_timezone_set('Asia/Tokyo');

echo "Stockholm Time: ";
echo print_r(getSunTime("Europe/Stockholm", false), true);

echo "Tokyo Time: ";
echo print_r(getSunTime("Europe/Stockholm", true), true);

// Output  
// Stockholm Time: Array ( [sunrise] => 07:37 [sunset] => 16:26 )   
// Tokyo Time: Array ( [sunrise] => 15:37 [sunset] => 00:26 )   
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