PHP 获取本月/本周第一天/最…

<!--获取本月第一天/最后一天的时间戳-->
<?php 
 $year = date("Y");
 $month = date("m");
 $allday = date("t");
 $strat_time =strtotime($year."-".$month."-1");
 $end_time =strtotime($year."-".$month."-".$allday);
 
 echo date("Y-m-d",$strat_time );
 echo date("Y-m-d",$end_time)
?>

获取本周第一天/最后一天的时间戳

<?php 
 $year = date("Y");
 $month = date("m");
 $day = date('w');
 $nowMonthDay = date("t");

 $firstday = date('d') - $day;
 if(substr($firstday,0,1) == "-"){
  $firstMonth = $month - 1;
  $lastMonthDay =date("t",$firstMonth);
  $firstday = $lastMonthDay -substr($firstday,1);
  $time_1 =strtotime($year."-".$firstMonth."-".$firstday);
 }else{
  $time_1 =strtotime($year."-".$month."-".$firstday);
 }
   
 $lastday = date('d') + (7 - $day);
 if($lastday >$nowMonthDay){
  $lastday = $lastday - $nowMonthDay;
  $lastMonth = $month + 1;
  $time_2 =strtotime($year."-".$lastMonth."-".$lastday);
 }else{
  $time_2 =strtotime($year."-".$month."-".$lastday);
 }
 
  echo date("Y-m-d",$time_1 );
 echo date("Y-m-d",$time_2)
?>

date_default_timezone_set('PRC'); //默认时区
echo "今天:",date("Y-m-d",time()),"<br>";
echo "今天:",date("Y-m-d",strtotime("18 june 2008")),"<br>";
echo "昨天:",date("Y-m-d",strtotime("-1 day")), "<br>";
echo "明天:",date("Y-m-d",strtotime("+1 day")), "<br>";
echo "一周后:",date("Y-m-d",strtotime("+1 week")), "<br>";
echo "一周零两天四小时两秒后:",date("Y-m-d G:H:s",strtotime("+1 week 2 days 4 hours 2 seconds")), "<br>";
echo "下个星期四:",date("Y-m-d",strtotime("next Thursday")), "<br>";
echo "上个周一:".date("Y-m-d",strtotime("last Monday"))."<br>";
echo "一个月前:".date("Y-m-d",strtotime("last month"))."<br>";
echo "一个月后:".date("Y-m-d",strtotime("+1 month"))."<br>";
echo "十年后:".date("Y-m-d",strtotime("+10 year"))."<br>";