java获取上周日，上上周日

public static void main(String[] args) { SimpleDateFormat smf = new SimpleDateFormat("yyyy-MM-dd"); System.out.println(smf.format(new Date())); Date d = lastMonday(); System.out.println(smf.format(d)); Date l = lastLastMonday(); System.out.println(smf.format(l)); }

/** * 获取上周天时间 */ public static 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; return getFirstDayOfWeek(calendar.getTime(), 1); }

/** * 获取下周天时间 */ public static Date nextMonday() { 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; return getFirstDayOfWeek(calendar.getTime(), 1); }

/** * 获取上上周天时间 */ public static Date lastLastMonday() { 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 getFirstDayOfWeek(calendar.getTime(), 1); }

/** * 得到某一天的该星期的第一日 00:00:00 * * @param date * @param firstDayOfWeek * 一个星期的第一天为星期几 * * @return */ public static Date getFirstDayOfWeek(Date date, int firstDayOfWeek) { Calendar cal = Calendar.getInstance(); if (date != null) cal.setTime(date); cal.setFirstDayOfWeek(firstDayOfWeek);//设置一星期的第一天是哪一天 cal.set(Calendar.DAY_OF_WEEK, firstDayOfWeek);//指示一个星期中的某天 cal.set(Calendar.HOUR_OF_DAY, 0);//指示一天中的小时。HOUR_OF_DAY 用于 24 小时制时钟。例如，在 10:04:15.250 PM 这一时刻，HOUR_OF_DAY 为 22。 cal.set(Calendar.MINUTE, 0);//指示一小时中的分钟。例如，在 10:04:15.250 PM 这一时刻，MINUTE 为 4。 cal.set(Calendar.SECOND, 0); cal.set(Calendar.MILLISECOND, 0); return cal.getTime(); }