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                            ~~~
>>> date('Y-m-28',  strtotime("2016-12-31 -1 month"))
=> "2016-12-28"
>>> date('Y-m-28',  strtotime("2016-01-31 +1 month"))
=> "2016-03-28"
>>> date('Y-m-d',  strtotime("2016-01-31 first day of +1 month"))
=> "2016-02-01"
$d = new DateTime('2015-01-31');
$d->modify('first day of next month');
echo $d->format('Y-m-28');
$d = new DateTime('2015-01-31');
$d->modify('first day of next month');
echo $d->format('Y-m-28');
MySQL: DATE_ADD('2011-01-31', INTERVAL 1 MONTH) returns 2011-02-28
~~~
獲取上周一的時間
~~~
>>> date('Y-m-d H:i:s',strtotime('-2 monday'))
=> "2016-10-03 00:00:00"
$days = date('w')==0?13:date('w')+6;

echo date('Y-m-d',time()-$days*86400);
date('Y-m-d', strtotime('-' . (6+date('w')) . ' days'));
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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