在PHP中将日期转换为M-d-y格式[重复]

How do I change the date format using PHP? I have used the following code but it is displaying the date input field value as m-d-Y. Why it is changing the format?

  $effectivedate = date('M-d-Y', strtotime($empCompensationdata-effective_date));
 $effective_date = date('Y-m-d', strtotime($empCompensationdata-effective_date));
 $("#effective_date").val($effectivedate);
 $('#effective_date').attr('data-value', $effective_date);

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The reason the value is displayed as M-d-Y is because that's what you're assigning to it with the val() method:

$effectivedate = date('M-d-Y', strtotime($empCompensationdata->effective_date));
 $effective_date = date('Y-m-d', strtotime($empCompensationdata->effective_date));
 $("#effective_date").val($effectivedate); //This variable contains "M-d-Y"
 $('#effective_date').attr('data-value', $effective_date);

So if you want to have Y-m-d, just change the assigning variable:

$("#effective_date").val($effective_date); //This variable contains "Y-m-d"