From the documentation:
Set a minimum selectable date via a Date object or as a string in the current dateFormat, or a number of days from today (e.g. +7) or a string of values and periods ('y' for years, 'm' for months, 'w' for weeks, 'd' for days, e.g. '-1y -1m'), or null for no limit.
Initialize a datepicker with the minDate option specified. $( ".selector" ).datepicker({ minDate: new Date(2007, 1 - 1, 1) });
So in your case:
$("#Q_106").datepicker({ minDate: new Date(+14) });