Java 日期工具类（今天、昨天、本周、上周、本月、上月、本年及特定时间的开始时间和结束时间）
2024-04-12 14:26:12
timestamp格式的部分
/*** 获取当天的开始时间* @return Timestamp* @author LoveEmperor_王子様* date: 2019/8/15 15:50*/public static Timestamp 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 new Timestamp(cal.getTimeInMillis());}/*** 获取当天的结束时间* @return Timestamp* @author LoveEmperor_王子様* date: 2019/8/15 15:49*/public static Timestamp getDayEnd() {Calendar cal = new GregorianCalendar();cal.set(Calendar.HOUR_OF_DAY, 23);cal.set(Calendar.MINUTE, 59);cal.set(Calendar.SECOND, 59);return new Timestamp(cal.getTimeInMillis());}/*** 获取昨天的开始时间* @return Timestamp* @author LoveEmperor_王子様* date: 2019/8/15 15:57*/public static Timestamp getBeginDayOfYesterday() {Calendar cal = new GregorianCalendar();cal.setTime(getDayBegin());cal.add(Calendar.DAY_OF_MONTH, -1);return new Timestamp(cal.getTimeInMillis());}/*** 获取昨天的结束时间* @return Timestamp* @author LoveEmperor_王子様* date: 2019/8/15 15:57*/public static Timestamp getEndDayOfYesterday() {Calendar cal = new GregorianCalendar();cal.setTime(getDayEnd());cal.add(Calendar.DAY_OF_MONTH, -1);return new Timestamp(cal.getTimeInMillis());}工具类代码
import java.sql.Timestamp;import java.util.ArrayList;import java.util.Calendar;import java.util.Date;import java.util.GregorianCalendar;import java.util.List;public class DateUtils {//获取当天的开始时间public static java.util.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();}//获取当天的结束时间public static java.util.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();}//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();}//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();}//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();}//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();}//获取本周的开始时间@SuppressWarnings("unused")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());}//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);}//获取上周的开始时间@SuppressWarnings("unused")public static Date getBeginDayOfLastWeek() {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 - 7);return getDayStartTime(cal.getTime());}//获取上周的结束时间public static Date getEndDayOfLastWeek(){Calendar cal = Calendar.getInstance();cal.setTime(getBeginDayOfLastWeek());cal.add(Calendar.DAY_OF_WEEK, 6);Date weekEndSta = cal.getTime();return getDayEndTime(weekEndSta);}//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());}//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());}//获取上月的开始时间public static Date getBeginDayOfLastMonth() {Calendar calendar = Calendar.getInstance();calendar.set(getNowYear(), getNowMonth() - 2, 1);return getDayStartTime(calendar.getTime());}//获取上月的结束时间public static Date getEndDayOfLastMonth() {Calendar calendar = Calendar.getInstance();calendar.set(getNowYear(), getNowMonth() - 2, 1);int day = calendar.getActualMaximum(5);calendar.set(getNowYear(), getNowMonth() - 2, day);return getDayEndTime(calendar.getTime());}//获取本年的开始时间public static java.util.Date getBeginDayOfYear() {Calendar cal = Calendar.getInstance();cal.set(Calendar.YEAR, getNowYear());// cal.setcal.set(Calendar.MONTH, Calendar.JANUARY);cal.set(Calendar.DATE, 1);return getDayStartTime(cal.getTime());}//获取本年的结束时间public static java.util.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());}//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());}//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());}//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 Integer.valueOf(gc.get(1));}//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(2) + 1;}//两个日期相减得到的天数public static int getDiffDays(Date beginDate, Date endDate) {if (beginDate == null || endDate == null) {throw new IllegalArgumentException("getDiffDays param is null!");}long diff = (endDate.getTime() - beginDate.getTime())/ (1000 * 60 * 60 * 24);int days = new Long(diff).intValue();return days;}//两个日期相减得到的毫秒数public static long dateDiff(Date beginDate, Date endDate) {long date1ms = beginDate.getTime();long date2ms = endDate.getTime();return date2ms - date1ms;}//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;}//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;}//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();}//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();}//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();}//获取某年某月到某年某月按天的切片日期集合（间隔天数的集合）@SuppressWarnings({ "rawtypes", "unchecked" })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;}//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）@SuppressWarnings({ "unchecked", "rawtypes" })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;}}调用
import java.text.SimpleDateFormat;SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String todayBegin = simpleDateFormat.format(DateUtils.getDayBegin());System.out.println(todayBegin );//输出结果为2017-10-26 00:00:00
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