Setting initial date does not work if the format is "M yyyy"

[anshajgoel]

I was working with the date format M yyyy which translates to abbreviation of the month followed by the complete year number. For example, Jan 2019

If the Datepicker's intialDate is set with a date of this particular format, the initialization does not work.
Although if it is initialized with the date format mm-dd-yyyy it works perfectly.

Example Configurations:

<input type="text" class="span2" id="dp1">
<script>
$(function(){
	$('#dp1').fdatepicker({
		initialDate: 'Jan 2005',
		format: 'M yyyy',
		disableDblClickSelection: true,
		leftArrow:'<<',
		rightArrow:'>>',
		closeIcon:'X',
		closeButton: true
	});
});
</script>