jsp 两个日期天数差计算

<script> ??function changeTimelyFlag(){ ????var date1 = GetXFormFieldValueById(‘fd_arrival_date‘); ???/*到达日期id*/ ????var date2 = GetXFormFieldValueById(‘fd_current_date‘); ???/*当前日期id*/var dateStartMillons = new Date(date2).getTime();var dateEndMillons = new Date(date1).getTime();var difDays = (dateEndMillons - dateStartMillons) / (24 * 60 * 60 * 1000);//计算出两个日期的差值。 ????if(difDays>=7){ ??????SetXFormFieldValueById(‘fd_timely_yes_no‘, "是"); ????} ????else ??????SetXFormFieldValueById(‘fd_timely_yes_no‘, "否"); ??}/*到达日期变化事件*/AttachXFormValueChangeEventById(‘fd_arrival_date‘, changeTimelyFlag ); /*到货日期*/AttachXFormValueChangeEventById(‘fd_delivery_date‘, changeTimelyFlag );