php - 获取即将到来的夏令时日期

Question

如何通过 PHP 获取特定时区即将到来的夏令时日期/时间更改？我想输出例如:

Upcoming clock change for Berlin will be on 29.10.2017 at 3am.

Answer 1

$date = new DateTime();
$tz = $date->getTimezone();
$changes = $tz->getTransitions(strtotime("yesterday"), strtotime("+1 year"));
$n = count($changes);
$tnow = time();
for($i = 0; $i < $n; $i++)
{
    if($changes[$i]["ts"] > $tnow)
    {
        echo "Upcoming clock change for " . $tz->getName() . " will be on " . $changes[$i]["time"] . "\n";
        break;
    }
}