In the old version of persiandatepicker (Behzadi) Calendar, I used to get a unique value for each day by executing the following code, which allowed me to calculate between days, var jdf = new jDateFunctions(); var pd = new persianDate(); $f = jdf.getJulianDayFromPersian(pd.parae($("#start").getControl.attr("data-jdate"))): Alert($f); but in the new version (https://github.com/behzadi/persianDatepicker) , this command does not work. Can anyone help me get a unique numeric value for each day in the new update of this library? Continue reading...