PHP时间处理类操作示例

<?php
function showTimeObj($msg,$timeObj)
{
  //使用预定义的格式来转换时间字符串
  if ($msg!=NULL)
  {
    echo $msg.":";
    echo "<br>".$timeObj->format(DATE_W3C)."<br>";
  }
  else
  {
    echo $timeObj->format(DATE_ATOM)."<br>";
  }
}
try
{
  //设置时区
  $timezones = new DateTimeZone('Asia/Shanghai');
  //获取当前时间
  $timeObj=new DateTime("now",$timezones);
}
catch (Exception $e)
{
  echo $e->getMessage();
}
//输出的+08:00代表东八区、若把时区设为'Asia/Tokyo',则为+09:00
showTimeObj('current time',$timeObj);
echo "<br>"."<br>";
echo "use DateInterval object to add date time".":"."<br>";
//加上一天(P=period,必备)
$timeObj->add(new DateInterval('P1D'));
showTimeObj('current time + 1 day',$timeObj);
//加上一小时(T=time,可选)
$timeObj->add(new DateInterval('P0DT1H'));
showTimeObj('current time + 1 day & 1hour',$timeObj);
echo "<br>"."<br>";
echo "use DatePeriod to process time range like a iterator".":"."<br>";
//DatePeriod: 迭代处理区间内的日期
$interval= new DateInterval('P0DT2H');
$start = new DateTime('2018-08-08',$timezones);
$end = new DateTime('2018-08-09',$timezones);
$timeRange = new DatePeriod($start,$interval,$end);
foreach ($timeRange as $hour)
{
  showTimeObj(NULL,$hour);
}
?>