js获计算时间差取年份

//传递开始、结束时间计算设置值function SetCompanyAge() { ???var startDateStr = DLMISForm_GetControl("HR_BasicInfo", "StartWork", -1).value;//入职时间 ???var endDateStr = getNowFormatDate();//当前时间 ???var year = getDateYearSub(startDateStr, endDateStr); ???DLMISForm_SetControl("HR_BasicInfo", "CompanyAge", -1, year);}//计算年份function getDateYearSub(startDateStr, endDateStr) { ???var day = 24 * 60 * 60 *1000; ????var sDate = new Date(Date.parse(startDateStr.replace(/-/g, "/"))); ???var eDate = new Date(Date.parse(endDateStr.replace(/-/g, "/"))); ???//得到前一天(算头不算尾) ???sDate = new Date(sDate.getTime() - day); ???//获得各自的年、月、日 ???var sY ?= sDate.getFullYear(); ????????var sM ?= sDate.getMonth()+1; ???var sD ?= sDate.getDate(); ???var eY ?= eDate.getFullYear(); ???var eM ?= eDate.getMonth()+1; ???var eD ?= eDate.getDate(); ???if(eY > sY && sM == eM && sD == eD) { ???????return eY - sY; ???} else { ???????//alert("两个日期之间并非整年，请重新选择"); ???????return 0; ???}}//获取当前时间function getNowFormatDate() { ???????var date = new Date(); ???????var seperator1 = "-"; ???????var year = date.getFullYear(); ???????var month = date.getMonth() + 1; ???????var strDate = date.getDate(); ???????if (month >= 1 && month <= 9) { ???????????month = "0" + month; ???????} ???????if (strDate >= 0 && strDate <= 9) { ???????????strDate = "0" + strDate; ???????} ???????var currentdate = year + seperator1 + month + seperator1 + strDate; ???????return currentdate; ???}