jQuery Datepicker for multiple inputs

Just change all id to class.

<input type="text" name="MyDate1" class="datepicker">
<input type="text" name="MyDate2" class="datepicker">

$(function() {
  $( ".datepicker" ).datepicker({ dateFormat: "yyyy-mm-dd" });
}); 

also can use

$(function() {
  $( "input[name^=MyDate]" ).datepicker({ dateFormat: "yyyy-mm-dd" });
});

Tired of repeating this, but still, am repeating it once more. ids have to be unique. So, use this:

<input type="text" name="MyDate1" class="datepicker">
<input type="text" name="MyDate2" class="datepicker">

with

$(function() {
    $( ".datepicker" ).datepicker({ dateFormat: "yyyy-mm-dd" });
});