Question

java如何得到上周一和上周日的日期

Answer 1

/**
* 获取上周五时间
*/
public Date lastFirday() {
　　//作用防止周日得到本周日期
Calendar calendar = Calendar.getInstance();
while (calendar.get(Calendar.DAY_OF_WEEK) != Calendar.MONDAY) {
calendar.add(Calendar.DAY_OF_WEEK, -1);
}
int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK) - 1;
int offset = 7 - dayOfWeek;
calendar.add(Calendar.DATE, offset - 9);
return DateTimeUtil.getFirstDayOfWeek(calendar.getTime(), 6);//这是从上周日开始数的到本周五为6
}

/**
* 获取上周一时间
*/
public Date lastMonday() {
Calendar calendar = Calendar.getInstance();
while (calendar.get(Calendar.DAY_OF_WEEK) != Calendar.MONDAY) {
calendar.add(Calendar.DAY_OF_WEEK, -1);
}
int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK) - 1;
int offset = 1 - dayOfWeek;
calendar.add(Calendar.DATE, offset - 7);
return DateTimeUtil.getFirstDayOfWeek(calendar.getTime(), 2);
}

Answer 2

Calendar preWeekSundayCal = Calendar.getInstance();
Calendar preWeekMondayCal = Calendar.getInstance();
//设置时间成本周第一天(周日)
preWeekSundayCal.set(Calendar.DAY_OF_WEEK,1);
preWeekMondayCal.set(Calendar.DAY_OF_WEEK,1);

//上周日时间
preWeekSundayCal.add(Calendar.DATE, -7);
//上周一时间
preWeekMondayCal.add(Calendar.DATE, -6);

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

//转化为日期
Date preWeekSunday = preWeekSundayCal.getTime();
Date preWeekMonday = preWeekMondayCal.getTime();

Answer 3

import java.text.SimpleDateFormat;
import java.util.Calendar;
public class Super2{
public static void main(String args[]){
Calendar cal = Calendar.getInstance();
//n为推迟的周数，1本周，-1向前推迟一周，2下周，依次类推
int n = 2;
String monday;
cal.add(Calendar.DATE, n*7);
//想周几，这里就传几Calendar.MONDAY（TUESDAY...）
cal.set(Calendar.DAY_OF_WEEK,Calendar.MONDAY);
monday = new SimpleDateFormat("yyyy-MM-dd").format(cal.getTime());
System.out.println(monday);
}
}

Answer 4

//上周一和上周日的日期
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
Calendar cal=Calendar.getInstance();
cal.set(Calendar.DAY_OF_WEEK, 1);
System.out.println("上周日为："+sdf.format(cal.getTime()));
cal.add(Calendar.WEEK_OF_MONTH, -1);
cal.set(Calendar.DAY_OF_WEEK, 2);
System.out.println("上周一为："+sdf.format(cal.getTime()));

Answer 5

//获取今天是一个星期的第几天
int value = LocalDate.now().getDayOfWeek().getValue();
//获取上周一 00:00:00时间
LocalDateTime startDays = LocalDate.now().minusWeeks(1).minusDays(value-1).atTime(0, 0, 0);
//获取上周日 23:59:29 时间
LocalDateTime endDays = LocalDate.now().minusWeeks(1).plusDays(7-value).atTime(23, 59, 59);