import java.text.SimpleDateFormat;
import java.util.Date;public class DateFormatExample {public static void main(String args[]) {Date today = new Date();System.out.println("今天 is : " + today);SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("dd-MM-yyyy");String date = DATE_FORMAT.format(today);System.out.println("今天 in dd-MM-yyyy format : " + date);DATE_FORMAT = new SimpleDateFormat("dd/MM/yy");date = DATE_FORMAT.format(today);System.out.println("今天 in dd/MM/yy pattern : " + date);//formatting Date with time informationDATE_FORMAT = new SimpleDateFormat("dd-MM-yy:HH:mm:SS");date = DATE_FORMAT.format(today);System.out.println("今天 in dd-MM-yy:HH:mm:SS : " + date);//SimpleDateFormat example - Date with timezone informationDATE_FORMAT = new SimpleDateFormat("dd-MM-yy:HH:mm:SS Z");date = DATE_FORMAT.format(today);System.out.println("今天 in dd-MM-yy:HH:mm:SSZ : " + date);}}

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.TimeZone;import org.joda.time.DateTime;
import org.joda.time.DateTimeConstants;
import org.joda.time.DateTimeZone;
import org.joda.time.Days;
import org.joda.time.LocalDate;import com.sun.istack.internal.Nullable;/*** 使用joda的时间工具类* @author soyoungboy**/
public class DateUtils {public static final long SECOND = 1000; // 1秒 java已毫秒为单位public static final long MINUTE = SECOND * 60; // 一分钟public static final long HOUR = MINUTE * 60; // 一小时public static final long DAY = HOUR * 24; // 一天public static final long WEEK = DAY * 7; // 一周public static final long YEAR = DAY * 365; // 一年public static final String FORMAT_TIME = "yyyy-MM-dd HH:mm:ss"; // 默认时间格式public static final String FORMAT_TIME_MINUTE = "yyyy-MM-dd HH:mm"; // 默认时间格式public static final String FORTER_DATE = "yyyy-MM-dd"; // 默认日期格式private static final Map<Integer, String> WEEK_DAY = new HashMap<Integer, String>();static {WEEK_DAY.put(7, "星期六");WEEK_DAY.put(1, "星期天");WEEK_DAY.put(2, "星期一");WEEK_DAY.put(3, "星期二");WEEK_DAY.put(4, "星期三");WEEK_DAY.put(5, "星期四");WEEK_DAY.put(6, "星期五");}/*** 获取当前系统时间* * @return yyyy-MM-dd HH:mm:ss*/public static String getCurrentTime() {DateTime dt = new DateTime();String time = dt.toString(FORMAT_TIME);return time;}/*** 获取系统当前时间按照指定格式返回* * @param pattern*            yyyy/MM/dd hh:mm:a* @return*/public static String getCurrentTimePattern(String pattern) {DateTime dt = new DateTime();String time = dt.toString(pattern);return time;}/*** 获取当前日期* * @return*/public static String getCurrentDate() {DateTime dt = new DateTime();String date = dt.toString(FORTER_DATE);return date;}/*** 获取当前日期按照指定格式* * @param pattern* @return*/public static String getCurrentDatePattern(String pattern) {DateTime dt = new DateTime();String date = dt.toString(pattern);return date;}/*** 按照时区转换时间* * @param date* @param timeZone*            时区* @param parrten* @return*/@Nullablepublic static String format(Date date, TimeZone timeZone, String parrten) {if (date == null) {return null;}SimpleDateFormat sdf = new SimpleDateFormat(parrten);sdf.setTimeZone(timeZone);return sdf.format(date);}/*** 获取指定时间* * @param year*            年* @param month*            月* @param day*            天* @param hour*            小时* @param minute*            分钟* @param seconds*            秒* @return yyyy-MM-dd HH:mm:ss*/public static String getPointTime(Integer year, Integer month, Integer day, Integer hour, Integer minute,Integer seconds) {DateTime dt = new DateTime(year, month, day, hour, minute, seconds);String date = dt.toString(FORMAT_TIME);return date;}/*** * @param year*            年* @param month*            月* @param day*            天* @param hour*            小时* @param minute*            分钟* @param seconds*            秒* @param parrten*            自定义格式* @return parrten*/public static String getPointTimePattern(Integer year, Integer month, Integer day, Integer hour, Integer minute,Integer seconds, String parrten) {DateTime dt = new DateTime(year, month, day, hour, minute, seconds);String date = dt.toString(parrten);return date;}/*** 获取指定日期* * @param year* @param month* @param day* @return*/public static String getPointDate(Integer year, Integer month, Integer day) {LocalDate dt = new LocalDate(year, month, day);String date = dt.toString(FORTER_DATE);return date;}/*** 获取指定日期 返回指定格式* * @param year* @param month* @param day* @param parrten* @return*/public static String getPointDatParrten(Integer year, Integer month, Integer day, String parrten) {LocalDate dt = new LocalDate(year, month, day);String date = dt.toString(parrten);return date;}/*** 获取当前是一周星期几* * @return*/public static String getWeek() {DateTime dts = new DateTime();String week = null;switch (dts.getDayOfWeek()) {case DateTimeConstants.SUNDAY:week = "星期日";break;case DateTimeConstants.MONDAY:week = "星期一";break;case DateTimeConstants.TUESDAY:week = "星期二";break;case DateTimeConstants.WEDNESDAY:week = "星期三";break;case DateTimeConstants.THURSDAY:week = "星期四";break;case DateTimeConstants.FRIDAY:week = "星期五";break;case DateTimeConstants.SATURDAY:week = "星期六";default:break;}return week;}/*** 获取指定时间是一周的星期几* * @param year* @param month* @param day* @return*/public static String getWeekPoint(Integer year, Integer month, Integer day) {LocalDate dts = new LocalDate(year, month, day);String week = null;switch (dts.getDayOfWeek()) {case DateTimeConstants.SUNDAY:week = "星期日";break;case DateTimeConstants.MONDAY:week = "星期一";break;case DateTimeConstants.TUESDAY:week = "星期二";break;case DateTimeConstants.WEDNESDAY:week = "星期三";break;case DateTimeConstants.THURSDAY:week = "星期四";break;case DateTimeConstants.FRIDAY:week = "星期五";break;case DateTimeConstants.SATURDAY:week = "星期六";break;default:break;}return week;}/*** 格式化日期* * @param date* @return yyyy-MM-dd HH:mm:ss*/@Nullablepublic static String format(Date date) {if (date == null) {return null;}SimpleDateFormat format = new SimpleDateFormat(FORMAT_TIME);return format.format(date);}/*** 格式化日期字符串* * @param date*            日期* @param pattern*            日期格式* @return*/@Nullablepublic static String format(Date date, String pattern) {if (date == null) {return null;}SimpleDateFormat format = new SimpleDateFormat(pattern);return format.format(date);}/*** 解析日期* * @param date*            日期字符串* @param pattern*            日期格式* @return*/@Nullablepublic static Date parse(String date, String pattern) {if (date == null) {return null;}Date resultDate = null;try {resultDate = new SimpleDateFormat(pattern).parse(date);} catch (ParseException e) {}return resultDate;}/*** 解析日期yyyy-MM-dd HH:mm:ss* * @param date*            日期字符串* @return*/@Nullablepublic static Date parse(String date) {if (date == null) {return null;}try {return new SimpleDateFormat(FORMAT_TIME).parse(date);} catch (ParseException e) {return null;}}/*** 解析日期 yyyy-MM-dd HH:mm:ss* * @param timestamp* @return*/public static String format(Long timestamp, String pattern) {String dateStr = "";if (null == timestamp || timestamp.longValue() < 0) {return dateStr;}try {Date date = new Date(timestamp);SimpleDateFormat format = new SimpleDateFormat(pattern);dateStr = format.format(date);} catch (Exception e) {// ignore
        }return dateStr;}/*** 解析日期 yyyy-MM-dd HH:mm:ss* * @param timestamp* @return*/public static String format(Long timestamp) {String dateStr = "";if (null == timestamp || timestamp.longValue() < 0) {return dateStr;}try {Date date = new Date(timestamp);SimpleDateFormat format = new SimpleDateFormat(FORMAT_TIME);dateStr = format.format(date);} catch (Exception e) {// ignore
        }return dateStr;}/*** 获取当前时间前几天时间,按指定格式返回* * @param days* @return*/public static String forwardDay(Integer days, String format) {DateTime dt = new DateTime();DateTime y = dt.minusDays(days);return y.toString(format);}/*** 获取当前时间前几天时间* * @param days* @return*/public static Date forwardDay(Integer days) {DateTime dt = new DateTime();DateTime y = dt.minusDays(days);return y.toDate();}/*** 获取指定时间之后或者之前的某一天00:00:00 默认返回当天* * @param days* @return*/public static Date day00(Integer days, String date, String zimeZone) throws Throwable {DateTime dt;TimeZone timeZone;try {if (isBlank(zimeZone)) {timeZone = TimeZone.getDefault();} else {timeZone = TimeZone.getTimeZone(zimeZone);}if (isBlank(date)) {dt = new DateTime().withZone(DateTimeZone.forTimeZone(timeZone)).toLocalDateTime().toDateTime();} else {dt = new DateTime(date).withZone(DateTimeZone.forTimeZone(timeZone)).toLocalDateTime().toDateTime();}} catch (Exception e) {throw new Throwable(e);}DateTime y = dt.minusDays(days).withHourOfDay(0).withMinuteOfHour(0).withSecondOfMinute(0);return y.toDate();}/*** 获取指定时间之后或者之前的某一天23:59:59 默认返回当天* * @param days*            偏移量* @return*/public static Date day59(Integer days, String date, String zimeZone) throws Throwable {DateTime dt;TimeZone timeZone;try {if (isBlank(zimeZone)) {timeZone = TimeZone.getDefault();} else {timeZone = TimeZone.getTimeZone(zimeZone);}if (isBlank(date)) {dt = new DateTime().withZone(DateTimeZone.forTimeZone(timeZone)).toLocalDateTime().toDateTime();} else {dt = new DateTime(date).withZone(DateTimeZone.forTimeZone(timeZone)).toLocalDateTime().toDateTime();}} catch (Exception e) {throw new Throwable(e);}DateTime y = dt.minusDays(days).withHourOfDay(23).withMinuteOfHour(59).withSecondOfMinute(59);return y.toDate();}/*** 计算两个时间相差多少天* * @param startDate* @param endDate* @return*/@Nullablepublic static Integer diffDay(Date startDate, Date endDate) {if (startDate == null || endDate == null) {return null;}DateTime dt1 = new DateTime(startDate);DateTime dt2 = new DateTime(endDate);int day = Days.daysBetween(dt1, dt2).getDays();return Math.abs(day);}/*** 获取某月之前,之后某一个月最后一天,24:59:59* * @return*/public static Date lastDay(Date date, Integer month) {DateTime dt1;if (month == null) {month = 0;}if (date == null) {dt1 = new DateTime().minusMonths(month);} else {dt1 = new DateTime(date).minusMonths(month);}DateTime lastDay = dt1.dayOfMonth().withMaximumValue().withHourOfDay(23).withMinuteOfHour(59).withSecondOfMinute(59);return lastDay.toDate();}/*** 获取某月月之前,之后某一个月第一天,00:00:00* * @return*/public static Date firstDay(Date date, Integer month) {DateTime dt1;if (month == null) {month = 0;}if (date == null) {dt1 = new DateTime().minusMonths(month);} else {dt1 = new DateTime(date).minusMonths(month);}DateTime lastDay = dt1.dayOfMonth().withMinimumValue().withHourOfDay(0).withMinuteOfHour(0).withSecondOfMinute(0);return lastDay.toDate();}public static Date addDay(Date date, int offset) {DateTime dt1;if (date == null) {dt1 = new DateTime().plusDays(offset);return dt1.toDate();}dt1 = new DateTime(date).plusDays(offset);return dt1.toDate();}/*** 传入日期时间与当前系统日期时间的比较, 若日期相同，则根据时分秒来返回 , 否则返回具体日期* * @return 日期或者 xx小时前||xx分钟前||xx秒前*/@Nullablepublic static String getNewUpdateDateString(Date now, Date createDate) {if (now == null || createDate == null) {return null;}Long time = (now.getTime() - createDate.getTime());if (time > (24 * 60 * 60 * 1000)) {return time / (24 * 60 * 60 * 1000) + "天前";} else if (time > (60 * 60 * 1000)) {return time / (60 * 60 * 1000) + "小时前";} else if (time > (60 * 1000)) {return time / (60 * 1000) + "分钟前";} else if (time >= 1000) {return time / 1000 + "秒前";}return "刚刚";}/*** * @Title: isBlank* @Description: TODO(判断字符串是否为空或长度为0 或由空格组成)* @param @param str* @param @return 设定文件* @return boolean 返回类型* @throws*/public static boolean isBlank(String str) {return (str == null || str.trim().length() == 0);}public static void main(String[] args) throws Throwable {System.out.println(lastDay(new Date(),2));System.out.println(firstDay(null,0));TimeZone zone1=TimeZone.getTimeZone("GMT+8");TimeZone zone2=TimeZone.getTimeZone("GMT-5");System.out.println(format(new Date(),zone1,FORMAT_TIME));System.out.println(format(new Date(),zone2,FORMAT_TIME));System.out.println(format(day00(0,"2017-5-11","GMT+0")));System.out.println(format(day00(0,"2017-5-11","GMT+8")));System.out.println(format(day00(0,"2017-5-11","GMT-8")));Date date1 =parse("2017-05-11 17:53:52");System.out.println(diffDay(date1,new Date()));DateTime dateTime = new DateTime().withDayOfWeek(1);DateTime dateTime1 = new DateTime().withDayOfWeek(7).withTime(0, 0,0, 0);System.out.println(format(dateTime.toDate()));System.out.println(format(dateTime1.toDate()));System.out.println(format(new Date(), "MM/dd"));}}

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