I end up using datepicker through jquery anywhere from 10-200 times.
I assume that you call datepicker() separately for each login, possibly with id . There is no need.
Use class as a hook on your input:
 <input class="my-datepicker"> 
Then call datepicker for elements with this class with your default configuration:
 $('.my-datepicker').datepicker({ dateFormat: 'yy-mm-dd' }); 
If you need a different configuration, use / assign a different class name.
You can also use setDefaults (maybe what you are looking for):
 $.datepicker.setDefaults({ dateFormat: 'yy-mm-dd' }); 
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