How do I set the first day and weeks for Bootstrap Datepicker

Some example. Hope it helps. AS usual goes inside $(document).ready(function(){});

$('#fromDate').datepicker('setStartDate', '-15d');
$('#fromDate').datepicker('setEndDate', '1d');
$('#toDate').datepicker('setStartDate', '-15d');
$('#toDate').datepicker('setEndDate', '1d');


    // Initialize the dates
$('#cv-rpt-sdate').datepicker({format: 'dd-mm-yyyy',"autoclose": true});
$('#cv-rpt-edate').datepicker({format: 'dd-mm-yyyy',"autoclose": true});
$('#cv-rpt-sdate').datepicker('setEndDate', '1d');
$('#cv-rpt-edate').datepicker('setEndDate', '1d');

$('#dboard-att-date').datepicker({format: 'dd-mm-yyyy',"autoclose": true});
$('#dboard-att-date').datepicker('setStartDate', '-7d');
$('#dboard-att-date').datepicker('setEndDate', '1d');

Try adding weekStart . Visit here for more details about it

$(document).ready(function () {
 $('#datepickeron').datepicker({
   weekStart: 0 // day of the week start. 0 for Sunday - 6 for Saturday
 });
});