private static void getWeekByDate(Date time) { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); // 设置时间格式 Calendar cal = Calendar.getInstance(); cal.setTime(time); // 判断要计算的日期是否是周日,如果是则减一天计算周六的,否则会出问题,计算到下一周去了 int dayWeek = cal.get(Calendar.DAY_OF_WEEK);// 获得当前日期是一个星期的第几天 if (1 == dayWeek) { cal.add(Calendar.DAY_OF_MONTH, -1); } System.out.println("要计算日期为:" + sdf.format(cal.getTime())); // 输出要计算日期 cal.setFirstDayOfWeek(Calendar.MONDAY);// 设置一个星期的第一天,按中国的习惯一个星期的第一天是星期一 int day = cal.get(Calendar.DAY_OF_WEEK);// 获得当前日期是一个星期的第几天 cal.add(Calendar.DATE, cal.getFirstDayOfWeek() - day);// 根据日历的规则,给当前日期减去星期几与一个星期第一天的差值 String imptimeBegin = sdf.format(cal.getTime()); System.out.println("所在周星期一的日期:" + imptimeBegin); cal.add(Calendar.DATE, 2); String imptimeMi = sdf.format(cal.getTime()); System.out.println("所在周星期三的日期:" + imptimeMi); cal.add(Calendar.DATE, 2); String imptimeEnd = sdf.format(cal.getTime()); System.out.println("所在周星期五的日期:" + imptimeEnd); }
获取当前是周几
public static final String getWeekZhCN(Date d1){ String weekDay = ""; String[] weekDays = {"周日", "周一", "周二", "周三", "周四", "周五", "周六"}; Calendar cal = Calendar.getInstance(); cal.setTime(d1); int w = cal.get(Calendar.DAY_OF_WEEK) - 1; if (w < 0) w = 0; weekDay = weekDays[w]; return weekDay; }
获取年月日
public String getDate() { if (this.date== null) {// Date d1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(String.valu));//定义起始日期 Date d1 = recieveTime;// SimpleDateFormat sdf0 = new SimpleDateFormat("yyyy"); SimpleDateFormat sdf1 = new SimpleDateFormat("M"); SimpleDateFormat sdf2= new SimpleDateFormat("d"); String month = sdf1.format(d1); String day = sdf2.format(d1); this.date =month+"."+day; } return date;
将日期的年月日以外时间,重置为00
Calendar calendar = Calendar.getInstance(); calendar.set(Calendar.HOUR_OF_DAY, 0); calendar.set(Calendar.MINUTE, 0); calendar.set(Calendar.SECOND, 0); calendar.set(Calendar.MILLISECOND, 0); return calendar.getTime();
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