I am using jquery datepicker http://jqueryui.com/datepicker/#default.
I have to input fields like from and to date.
so in to date the from date should be present as least value in date picker.
<input class="user-reg-input fl" type="text" name="Duration_From[]" id="Duration_From1" value="" maxlength="25" style="width:117px;" />
<input class="user-reg-input fl" type="text" name="Duration_To[]" id="Duration_To1" value="" maxlength="25" style="width:117px;" />
You can try this.