PHP Datetime：如何获取一天中的第一个小时和最后一个小时？

Question

在 PHP \DateTime 或 Carbon 中，很容易执行诸如 new \DateTime('first day of last Month'); 或 < code>new \DateTime('上个月的最后一天')，我想知道是否有类似于最后一天的第一个小时和最后一天的最后一个小时的东西？月和周的现有代码如下所示，我需要在日级别执行此操作并相应地分配这些变量：

if ($this->monthWeekSelect === 'month') {
    $this->lastMonthFirstDay = new \DateTime('first day of last month');
    $this->lastMonthLastDay = new \DateTime('last day of last month');
    $this->currentMonthFirstDay = new \DateTime('first day of this month');
    $this->currentMonthLastDay = new \DateTime('last day of this month');
    $this->oneMonthFirstDay = new \DateTime('first day of +1 month');
    $this->oneMonthLastDay = new \DateTime('last day of +1 month');
    $this->twoMonthFirstDay = new \DateTime('first day of +2 month');
    $this->twoMonthLastDay = new \DateTime('last day of +2 month');
    $this->threeMonthFirstDay = new \DateTime('first day of +3 month');
    $this->threeMonthLastDay = new \DateTime('last day of +3 month');
} else { // For Week
    $this->lastMonthFirstDay = new \DateTime('monday last week');
    $this->lastMonthLastDay = new \DateTime('sunday last week');
    $this->currentMonthFirstDay = new \DateTime('monday this week');
    $this->currentMonthLastDay = new \DateTime('sunday this week');
    $this->oneMonthFirstDay = (new Carbon('monday this week'))->addWeek(1);
    $this->oneMonthLastDay = (new Carbon('sunday this week'))->addWeek(1);
    $this->twoMonthFirstDay = (new Carbon('monday this week'))->addWeek(2);
    $this->twoMonthLastDay = (new Carbon('sunday this week'))->addWeek(2);
    $this->threeMonthFirstDay = (new Carbon('monday this week'))->addWeek(3);
    $this->threeMonthLastDay = (new Carbon('sunday this week'))->addWeek(3);
}

Answer 1

时间可以与相对日期表达式一起编写。

$lastHourCurrentDay = date_create('today 23:00');  //or new DateTime('today 23:00');
$firstHourCurrentDay = date_create('today');  //or 'today 00:00'
$lastHourYesterday = new DateTime('Yesterday 23:00');