Give every day (<td>) of datepicker a ID

Give every day (<td>) of datepicker a ID

Hello.
Is there a possibility to give every day in a datepicker a id?

For example:
<td data-year="2015" data-month="4" data-event="click" data-handler="selectDay" id="datepicker20150412" class=" "><a href="#" class="ui-state-default">12</a></td>

The problem is that i do not want to use beforeShowDay to highlight the days.
I have to show different date-ranges (01.01.2015 - 03.01.2015,...) in the datepicker, and i need a easy way to add and remove classes.

regards

Daniel