js:
//获取当前日期
var myDate = new Date();
var nowY = myDate.getFullYear();
var nowM = myDate.getMonth()+1;
var nowD = myDate.getDate();
var enddate = nowY+"-"+(nowM<10 ? "0" + nowM : nowM)+"-"+(nowD<10 ? "0"+ nowD : nowD);//当前日期
//获取三十天前日期
var lw = new Date(myDate - 1000 * 60 * 60 * 24 * 30);//最后一个数字30可改,30天的意思
var lastY = lw.getFullYear();
var lastM = lw.getMonth()+1;
var lastD = lw.getDate();
var startdate=lastY+"-"+(lastM<10 ? "0" + lastM : lastM)+"-"+(lastD<10 ? "0"+ lastD : lastD);//三十天之前日期
===========================================================================================================
java:
//获取当前日期
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date today = new Date();
String endDate = sdf.format(today);//当前日期
//获取三十天前日期
Calendar theCa = Calendar.getInstance();
theCa.setTime(today);
theCa.add(theCa.DATE, -30);//最后一个数字30可改,30天的意思
Date start = theCa.getTime();
String startDate = sdf.format(start);//三十天之前日期
2018年5月23日更新:
/**
* 在原有的日期上往后推,计算得出新的日期.
*
* @param billingDate 日期
* @param days 天数
* @return 计算后的日期
*/
public static java.sql.Date dateAfter(Date billingDate, int days) {
Calendar cal = Calendar.getInstance();
cal.setTime(billingDate);
cal.add(Calendar.DATE, days);
java.sql.Date date = new java.sql.Date(cal.getTime().getTime());
return date;
}