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在实际项目开发过程中，获取任意时间的起始和结束时间是常用操作，尤其对于统计业务来说，更是必要操作，理解了时间自定义的规律，对于开发人员的效率提升是大有裨益的。

一.获取任意年的起始和结束时间

1.获取任意年的起始时间

public static Date getDateByBeforeYear(Date today, int number) {Calendar todayEnd = Calendar.getInstance();todayEnd.setTime(today);todayEnd.set(Calendar.YEAR, todayEnd.get(Calendar.YEAR) - number);todayEnd.set(Calendar.MONTH, 0);todayEnd.set(Calendar.DAY_OF_MONTH, 1);todayEnd.set(Calendar.HOUR_OF_DAY, 0);todayEnd.set(Calendar.MINUTE, 0);todayEnd.set(Calendar.SECOND, 0);todayEnd.set(Calendar.MILLISECOND, 0);return todayEnd.getTime();
}

2.获取任意年的结束时间

public static Date getDateByAfterYearNew(Date today, int number) {Calendar todayEnd = Calendar.getInstance();todayEnd.setTime(today);todayEnd.set(Calendar.YEAR, todayEnd.get(Calendar.YEAR) - number);todayEnd.set(Calendar.MONTH, 11);todayEnd.set(Calendar.DAY_OF_MONTH, 31);todayEnd.set(Calendar.HOUR_OF_DAY, 23);todayEnd.set(Calendar.MINUTE, 59);todayEnd.set(Calendar.SECOND, 59);todayEnd.set(Calendar.MILLISECOND, 999);return todayEnd.getTime();
}

 二.获取任意月的起始和结束时间

1.获取任意月的起始时间

public static Date getDateByBeforeMonth(Date today, int number) {Calendar todayEnd = Calendar.getInstance();todayEnd.setTime(today);todayEnd.set(Calendar.MONTH, todayEnd.get(Calendar.MONTH) - number);todayEnd.set(Calendar.DAY_OF_MONTH, 1);todayEnd.set(Calendar.HOUR_OF_DAY, 0);todayEnd.set(Calendar.MINUTE, 0);todayEnd.set(Calendar.SECOND, 0);todayEnd.set(Calendar.MILLISECOND, 0);return todayEnd.getTime();
}

2.获取任意月的结束时间

public static Date getDateByAfterMonthNew(Date today, int number) {Calendar todayEnd = Calendar.getInstance();todayEnd.setTime(today);todayEnd.set(Calendar.MONTH, todayEnd.get(Calendar.MONTH)-number);todayEnd.set(Calendar.DAY_OF_MONTH, 0);todayEnd.set(Calendar.HOUR_OF_DAY, 23);todayEnd.set(Calendar.MINUTE, 59);todayEnd.set(Calendar.SECOND, 59);todayEnd.set(Calendar.MILLISECOND, 999);return todayEnd.getTime();
}

三.获取任意日的起始和结束时间

1.获取任意日的起始时间

public static Date getDateByBeforeDay(Date today, int day) {Calendar todayEnd = Calendar.getInstance();todayEnd.setTime(today);todayEnd.set(Calendar.DAY_OF_MONTH, todayEnd.get(Calendar.DAY_OF_MONTH) - day);todayEnd.set(Calendar.HOUR_OF_DAY, 0);todayEnd.set(Calendar.MINUTE, 0);todayEnd.set(Calendar.SECOND, 0);todayEnd.set(Calendar.MILLISECOND, 0);return todayEnd.getTime();
}

2.获取任意日的结束时间

public static Date getDateByAfterDayNew(Date today, int day) {Calendar todayEnd = Calendar.getInstance();todayEnd.setTime(today);todayEnd.set(Calendar.DAY_OF_MONTH, todayEnd.get(Calendar.DAY_OF_MONTH) - day);todayEnd.set(Calendar.HOUR_OF_DAY, 23);todayEnd.set(Calendar.MINUTE, 59);todayEnd.set(Calendar.SECOND, 59);todayEnd.set(Calendar.MILLISECOND, 999);return todayEnd.getTime();
}

四.获取任意时的起始和结束时间

1.获取任意时的起始时间

public static Date getDateByBeforeHour(Date today, int number) {Calendar todayEnd = Calendar.getInstance();todayEnd.setTime(today);todayEnd.set(Calendar.HOUR_OF_DAY, todayEnd.get(Calendar.HOUR_OF_DAY) - number);todayEnd.set(Calendar.MINUTE, 0);todayEnd.set(Calendar.SECOND, 0);todayEnd.set(Calendar.MILLISECOND, 0);return todayEnd.getTime();
}

 2.获取任意时的结束时间

public static Date getDateByAfterHourNew(Date today, int number) {Calendar todayEnd = Calendar.getInstance();todayEnd.setTime(today);todayEnd.set(Calendar.HOUR_OF_DAY, todayEnd.get(Calendar.HOUR_OF_DAY) - number);todayEnd.set(Calendar.MINUTE, 59);todayEnd.set(Calendar.SECOND, 59);todayEnd.set(Calendar.MILLISECOND, 999);return todayEnd.getTime();
}

五.获取任意时间的周信息

public static Integer getWeekOfDate(Date date) {Integer[] weekDays = {7, 1, 2, 3, 4, 5, 6};Calendar cal = Calendar.getInstance();cal.setTime(date);int w = cal.get(Calendar.DAY_OF_WEEK) - 1;if (w < 0) {w = 0;}return weekDays[w];
}

 六.获取任意时间是否在时间区间内

public static boolean belongCalendar(Date queryTime, Date from, Date to) {Calendar queryInfo = Calendar.getInstance();queryInfo .setTime(queryTime);Calendar after = Calendar.getInstance();after.setTime(from);Calendar before = Calendar.getInstance();before.setTime(to);if (queryInfo.after(after) && queryInfo.before(before)) {return true;} else {return false;}
}

 七.其他相关方法持续更新中

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