date_default_timezone_set('Asia/Shanghai');

    echo  "timestamp now：".strtotime ( "now" ),  "<br>" ;

//补全 其他 代码 

echo  "timestamp of 10 September 2000：".strtotime ( "10 September 2000" ),  "<br>" ;

echo  "timestamp of next day：",strtotime('+1 day'),  "<br>" ;

echo  "timestamp of next week：",strtotime('+1 week'),  "<br>" ;

echo  "timestamp of next week 2 days 4 hours 2 seconds：",strtotime('+1 week 2 days 4 hours 2 seconds'),  "<br>" ;

echo  "timestamp of next Thursday：",strtotime('next Thursday'),  "<br>" ;

echo  "timestamp of next Thursday：",strtotime('last Monday'),  "<br>" ;