date minus seconds always returns same

2018-06-21 00:21:18

echo date('Y-m-d H:m:s', strtotime('15 minutes ago')) . "<br/>";
echo date('Y-m-d H:m:s', time()-900) . "<br/>";
echo date('Y-m-d H:m:s', time());

我在Windows 7上运行WAMPP，并且所有3次调用都返回同一时间。

'H:m:s' should be 'H:i:s'
   ^                 ^

Spot the difference

m = Months

i = Minutes

The error in your code:

'Ymd H:m:s' should be 'Ymd H:i:s'

m is month i is minute

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