Strtotime was not working in php with m-d-Y format in php? [duplicate]

     
  

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i have m-d-Y date format but i want Y-m-d format using strtotime but it doesn't work?


$date_time = '05-23-2017 01:00';  echo date('Y-m-d H:i:s' strtotime($date_time));  

but it will give output "1970-01-01 01:00:00" instead of "2017-05-23 01:00:00"