public static Date getDayBegin() {Calendar cal = new GregorianCalendar();cal.set(Calendar.HOUR_OF_DAY, 0);cal.set(Calendar.MINUTE, 0);cal.set(Calendar.SECOND, 0);cal.set(Calendar.MILLISECOND, 0);return cal.getTime();}
2.2 获取当天的结束时间
public static Date getDayEnd() {Calendar cal = new GregorianCalendar();cal.set(Calendar.HOUR_OF_DAY, 23);cal.set(Calendar.MINUTE, 59);cal.set(Calendar.SECOND, 59);return cal.getTime();}
2.3 获取昨天的开始时间
public static Date getBeginDayOfYesterday() {Calendar cal = new GregorianCalendar();cal.setTime(getDayBegin());cal.add(Calendar.DAY_OF_MONTH, -1);return cal.getTime();}
2.4 获取昨天的结束时间
public static Date getEndDayOfYesterDay() {Calendar cal = new GregorianCalendar();cal.setTime(getDayEnd());cal.add(Calendar.DAY_OF_MONTH, -1);return cal.getTime();}
2.5 获取明天的开始时间
public static Date getBeginDayOfTomorrow() {Calendar cal = new GregorianCalendar();cal.setTime(getDayBegin());cal.add(Calendar.DAY_OF_MONTH, 1);return cal.getTime();}
2.6 获取明天的结束时间
public static Date getEndDayOfTomorrow() {Calendar cal = new GregorianCalendar();cal.setTime(getDayEnd());cal.add(Calendar.DAY_OF_MONTH, 1);return cal.getTime();}
2.7 获取本周的开始时间
public static Date getBeginDayOfWeek() {Date date = new Date();if (date == null) {return null;}Calendar cal = Calendar.getInstance();cal.setTime(date);int dayofweek = cal.get(Calendar.DAY_OF_WEEK);if (dayofweek == 1) {dayofweek += 7;}cal.add(Calendar.DATE, 2 - dayofweek);return getDayStartTime(cal.getTime());}
2.8 获取本周的结束时间
public static Date getEndDayOfWeek() {Calendar cal = Calendar.getInstance();cal.setTime(getBeginDayOfWeek());cal.add(Calendar.DAY_OF_WEEK, 6);Date weekEndSta = cal.getTime();return getDayEndTime(weekEndSta);}
2.9 获取本月的开始时间
public static Date getBeginDayOfMonth() {Calendar calendar = Calendar.getInstance();calendar.set(getNowYear(), getNowMonth() - 1, 1);return getDayStartTime(calendar.getTime());}
2.10 获取本月的结束时间
public static Date getEndDayOfMonth() {Calendar calendar = Calendar.getInstance();calendar.set(getNowYear(), getNowMonth() - 1, 1);int day = calendar.getActualMaximum(5);calendar.set(getNowYear(), getNowMonth() - 1, day);return getDayEndTime(calendar.getTime());}
2.11 获取上个月的开始时间
public static Date getBeginDayOfLastMonth(int n) {Date date = new Date();Calendar calendar = Calendar.getInstance();calendar.setTime(date);calendar.add(calendar.MONTH, -n);calendar.set(calendar.DAY_OF_MONTH, 1);return getDayStartTime(calendar.getTime());}
2.12 获取上个月的结束时间
public static Date getEndDayOfLastMonth(int n) {Date date = new Date();Calendar calendar = Calendar.getInstance();calendar.setTime(date);calendar.add(calendar.MONTH, -n);int day = calendar.getActualMaximum(5);calendar.set(calendar.DAY_OF_MONTH, day);return getDayEndTime(calendar.getTime());}
2.13 获取本年的开始时间
public static Date getBeginDayOfYear() {Calendar cal = Calendar.getInstance();cal.set(Calendar.YEAR, getNowYear());cal.set(Calendar.MONTH, Calendar.JANUARY);cal.set(Calendar.DATE, 1);return getDayStartTime(cal.getTime());}
2.14 获取n年前的开始时间
public static Date getBeginDayOfLastYear(int n) {Calendar cal = Calendar.getInstance();cal.set(Calendar.YEAR, getNowYear() - n);cal.set(Calendar.MONTH, Calendar.JANUARY);cal.set(Calendar.DATE, 1);return getDayStartTime(cal.getTime());}
2.15 获取n年前的结束时间
public static Date getEndDayOfLastYear(int n) {Calendar cal = Calendar.getInstance();cal.set(Calendar.YEAR, getNowYear() - n);cal.set(Calendar.MONTH, Calendar.DECEMBER);cal.set(Calendar.DATE, 31);return getDayEndTime(cal.getTime());}
2.16 获取本年的结束时间
public static Date getEndDayOfYear() {Calendar cal = Calendar.getInstance();cal.set(Calendar.YEAR, getNowYear());cal.set(Calendar.MONTH, Calendar.DECEMBER);cal.set(Calendar.DATE, 31);return getDayEndTime(cal.getTime());}
2.17 获取某个日期的开始时间
public static Timestamp getDayStartTime(Date d) {Calendar calendar = Calendar.getInstance();if (null != d)calendar.setTime(d);calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH), 0,0, 0);calendar.set(Calendar.MILLISECOND, 0);return new Timestamp(calendar.getTimeInMillis());}
2.18 获取某个日期的结束时间
public static Timestamp getDayEndTime(Date d) {Calendar calendar = Calendar.getInstance();if (null != d)calendar.setTime(d);calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH), 23,59, 59);calendar.set(Calendar.MILLISECOND, 999);return new Timestamp(calendar.getTimeInMillis());}
2.19 获取今年是哪一年
// 获取今年是哪一年
public static Integer getNowYear() {Date date = new Date();GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();gc.setTime(date);return gc.get(Calendar.YEAR);}
2.20 获取本月是哪一月
public static int getNowMonth() {Date date = new Date();GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();gc.setTime(date);return gc.get(Calendar.MONTH) + 1;}
2.21 时间差值计算校验(开始与结束时间不可为空)
public static void dateMarginCheck(Date beginDate, Date endDate) {if (beginDate == null || endDate == null) {throw new IllegalArgumentException("getDiffDays param is null!");}}
2.22 日期相减得到的天数(不足一天为1 超时为-1)
public static int getExactDiffDays(Date beginDate, Date endDate) {dateMarginCheck(beginDate, endDate);BigDecimal subtract = new BigDecimal(endDate.getTime()).subtract(new BigDecimal(beginDate.getTime()));BigDecimal divide = subtract.divide(new BigDecimal(1000 * 60 * 60 * 24), RoundingMode.UP);return divide.intValue();}
2.23 两个日期相减得到的天数[不精确]
// 两个日期相减得到的天数
public static int getDiffDays(Date beginDate, Date endDate) { dateMarginCheck(beginDate, endDate);
long diff = (endDate.getTime() - beginDate.getTime() - 1000) / (1000 * 60 * 60 * 24); return new Long(diff).intValue();
}
2.24 两个日期相减得到的小时
public static int getDiffHours(Date beginDate, Date endDate) { dateMarginCheck(beginDate, endDate); long diff = (endDate.getTime() - beginDate.getTime()) / (1000 * 60 * 60); return new Long(diff).intValue();
}
2.25 两个日期相减得到的毫秒数
public static long dateDiff(Date beginDate, Date endDate) {
//开始时间或结束时间为空 返回0L 毫秒
if (beginDate == null || endDate == null) {
return 0L;
} long date1ms = beginDate.getTime();
long date2ms = endDate.getTime();
return date2ms - date1ms;
}
2.26 获取两个日期中的最大日期
public static Date max(Date beginDate, Date endDate) {if (beginDate == null) {return endDate;}if (endDate == null) {return beginDate;}if (beginDate.after(endDate)) {return beginDate;}return endDate;}
2.27 获取两个日期中的最小日期
public static Date min(Date beginDate, Date endDate) {if (beginDate == null) {return endDate;}if (endDate == null) {return beginDate;}if (beginDate.after(endDate)) {return endDate;}return beginDate;}
2.28 返回某月该季度的第一个月
public static Date getFirstSeasonDate(Date date) {final int[] SEASON = {1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4};Calendar cal = Calendar.getInstance();cal.setTime(date);int sean = SEASON[cal.get(Calendar.MONTH)];cal.set(Calendar.MONTH, sean * 3 - 3);return cal.getTime();}
2.29 返回某个日期下几天的日期
public static Date getNextDay(Date date, int i) {Calendar cal = new GregorianCalendar();cal.setTime(date);cal.set(Calendar.DATE, cal.get(Calendar.DATE) + i);return cal.getTime();}
2.30 返回某个日期前几天的日期
public static Date getFrontDay(Date date, int i) {Calendar cal = new GregorianCalendar();cal.setTime(date);cal.set(Calendar.DATE, cal.get(Calendar.DATE) - i);return cal.getTime();}
2.31 获取某年某月到某年某月按天的切片日期集合
public static List getTimeList(int beginYear, int beginMonth, int endYear, int endMonth, int k) {List list = new ArrayList();if (beginYear == endYear) {for (int j = beginMonth; j <= endMonth; j++) {list.add(getTimeList(beginYear, j, k));}} else {{for (int j = beginMonth; j < 12; j++) {list.add(getTimeList(beginYear, j, k));} for (int i = beginYear + 1; i < endYear; i++) {
for (int j = 0; j < 12; j++) {
list.add(getTimeList(i, j, k)); } }
for (int j = 0; j <= endMonth; j++) {
list.add(getTimeList(endYear, j, k)); } }
}
return list;
}
2.32 获取某年某月按天切片日期集合(某个月间隔多少天的日期集合)
public static List getTimeList(int beginYear, int beginMonth, int k) {List list = new ArrayList();Calendar begincal = new GregorianCalendar(beginYear, beginMonth, 1);int max = begincal.getActualMaximum(Calendar.DATE);for (int i = 1; i < max; i = i + k) {list.add(begincal.getTime());begincal.add(Calendar.DATE, k);}begincal = new GregorianCalendar(beginYear, beginMonth, max);list.add(begincal.getTime());return list;}
2.33 获取某年某月的第一天日期
public static Date getStartMonthDate(int year, int month) {Calendar calendar = Calendar.getInstance();calendar.set(year, month - 1, 1, 0, 0, 0);return calendar.getTime();}
2.34 获取某年某月的最后一天日期
public static Date getEndMonthDate(int year, int month) {Calendar calendar = Calendar.getInstance();calendar.set(year, month - 1, 1);int day = calendar.getActualMaximum(5);calendar.set(year, month - 1, day, 23, 59, 59);return calendar.getTime();}
public static Date getNowDate() {Calendar calendar = Calendar.getInstance();calendar.set(Calendar.MILLISECOND, 0);return calendar.getTime();
}
2.41 时间字符串转换date
public static Date getStrToDate(String dateStr) throws ParseException {SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");return format.parse(dateStr);
}
2.42 获取到?天后的Date类型时间
public static Date getAfterDayEnd(Date startTime, int days) {Calendar cal = Calendar.getInstance();cal.setTime(startTime);cal.add(Calendar.DAY_OF_MONTH, days);//跟随月份走的天数<构造器中写了每个月的天数...>return cal.getTime();}
2.43 n小时后的时间
public static Date getAfterHourEnd(Date startTime, int hours) {Calendar cal = Calendar.getInstance();cal.setTime(startTime);cal.add(Calendar.HOUR_OF_DAY, hours);//24小时制度return cal.getTime();}