echo date('Y-m',strtotime('-1 months'));
echo "\r\n";
echo date('Y-m',strtotime('first day of last month'));
echo "\r\n";
echo date('Y-m',strtotime('-1 week'));
当遇到月为31日是 date('Y-m',strtotime('-1 months'));求的月份还是当月的
正确使用方式
echo date('Y-m',strtotime('first day of last month'));
echo date('Y-m-d H:i:s', strtotime('-1 month', strtotime(date('Y-m'))));
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