【springboot项目源码】电影院会员管理系统.rar

package com.zrkworld.cinema.utils; import org.junit.Test; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Calendar; /** * @author zrk * @version 1.0 * @date 2020/5/1 0001 11:45 */ public class DateManageSystem { /** * 返回上一周的周一到周日的字符串格式日期（时分秒清零） * @return String[] * @throws ParseException */ public String[] getLastWeek() { Calendar cal = Calendar.getInstance(); String[] week = new String[7]; //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 = -1; cal.add(Calendar.DATE, n * 7); //想周几，这里就传几Calendar.MONDAY（TUESDAY...） for (int i = 0; i < 7; i++) { cal.set(Calendar.DAY_OF_WEEK, 2 + i); //时分秒毫秒域清零 cal.set(Calendar.HOUR_OF_DAY, 0); cal.set(Calendar.MINUTE, 0); cal.set(Calendar.SECOND, 0); cal.set(Calendar.MILLISECOND, 0); week[i] = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(cal.getTime()); } return week; } /*SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); Calendar c = Calendar.getInstance(); 1.过去七天 c.setTime(new Date()); c.add(Calendar.DATE, - 7); Date d = c.getTime(); String day = format.format(d); System.out.println("过去七天："+day); 2.过去一月 c.setTime(new Date()); c.add(Calendar.MONTH, -1); Date m = c.getTime(); String mon = format.format(m); System.out.println("过去一个月："+mon); 3.过去三个月 c.setTime(new Date()); c.add(Calendar.MONTH, -3); Date m3 = c.getTime(); String mon3 = format.format(m3); System.out.println("过去三个月："+mon3); 4.过去一年 c.setTime(new Date()); c.add(Calendar.YEAR, -1); Date y = c.getTime(); String year = format.format(y); System.out.println("过去一年："+year); 5.现在时间24小时制 SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String nowDate=format.format(new Date()); System.out.println(nowDate); 6.当天的开始时间 SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); Calendar c = Calendar.getInstance(); String start = format.format(c.getTime())+" 00:00:00"; System.out.println(start); 7.当天的截止时间 SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); Calendar calendar = Calendar.getInstance(); String end = format.format(calendar.getTime())+" 23:59:59"; System.out.println(end); 8.当前时间的前一个星期 开始时间 SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); Calendar c = Calendar.getInstance(); c.add(Calendar.DAY_OF_MONTH, -6); String start = format.format(c.getTime())+" 00:00:00"; System.out.println(start); 9.当天日期前一个月 SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); Calendar c = Calendar.getInstance(); c.add(Calendar.MONTH, -1); //得到前一个月 String start = format.format(c.getTime())+" 00:00:00"; System.out.println(start); 10.当前时间的前一年开始时间 SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); Calendar c = Calendar.getInstance(); c.add(Calendar.YEAR, -1); //年份减1 String start =format.format(c.getTime())+" 00:00:00"; System.out.println(start); 11.当前时间的周一时间和周末时间 setfirstdayofweek（）方法 SimpleDateFormat format = new SimpleDateFormat("YYYY-MM-dd "); Calendar c = Calendar.getInstance(); c.set(Calendar.DAY_OF_WEEK,Calendar.MONDAY); String weekStart = format.format(c.getTime())+" 00:00:00"; System.out.println(weekStart); Calendar ca = Calendar.getInstance(); ca.setFirstDayOfWeek(Calendar.MONDAY); ca.set(Calendar.DAY_OF_WEEK, ca.getFirstDayOfWeek() + 6); // Sunday String weekEnd = format.format(ca.getTime())+" 23:59:59"; System.out.println(weekEnd); 12.当前时所在月份的第一天和最后一天 SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd"); Calendar c = Calendar.getInstance(); c.set(Calendar.DAY_OF_MONTH,1);//设置为1号,当前日期既为本月第一天 String monthStart = format.format(c.getTime())+" 00:00:00"; System.out.println(monthStart); Calendar ca = Calendar.getInstance(); ca.set(Calendar.DAY_OF_MONTH, ca.getActualMaximum(Calendar.DAY_OF_MONTH)); String monthEnd = format.format(ca.getTime())+" 23:59:59"; System.out.println(monthEnd); 13.当期时间所在年份的开始时间 SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); Calendar c = Calendar.getInstance(); c.set(c.get(Calendar.YEAR) ,0, 1);//开始时间日期 String yearStart = format.format(c.getTime())+" 00:00:00"; System.out.println(yearStart); Calendar ca = Calendar.getInstance(); ca.set(ca.get(Calendar.YEAR) ,11, ca.getActualMaximum(Calendar.DAY_OF_MONTH));//结束日期 String yearEnd = format.format(ca.getTime())+" 23:59:59"; System.out.println(yearEnd); 14.计算时间差取得两个时间的微秒级的时间差 //得微秒级时间差 long val = calendarEnd.getTimeInMillis() - calendarBegin.getTimeInMillis(); //换算后得到天数 long day = val / (1000 * 60 * 60 * 24); 15.获取某个时间的上周一和周日 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 = 1; 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);*/ }