java.util.Date，.Calendar和SimpleDateFormat类都是线程不安全的

joda-time是一个常用的时间处理类库，它提供了如下几个常用的类：

Instant：用来表示时间轴上一个瞬时的点
DateTime：用来替换JDK的Calendar类
LocalDate：表示一个本地的日期，而不包含时间部分（没有时区信息）
LocalTime：表示一个本地的时间，而不包含日期部分（没有时区信息）
LocalDateTime：表示一个本地的日期－时间（没有时区信息）

Joda-Time的使用

pom

<dependency><groupId>joda-time</groupId><artifactId>joda-time</artifactId><version>2.10.2</version></dependency>

示例

	public static void main(String[] args) {//构造对象DateTime now = new DateTime();System.out.println(now);DateTime dt2 = new DateTime(2021,2,12,12,00,30);System.out.println(dt2);DateTime dt3 = new DateTime(1618119910486L);System.out.println(dt3);DateTime dt4 = new DateTime(new Date());System.out.println(dt4);DateTime dt5 = new DateTime("2021-04-11T13:45:10.594+08:00");System.out.println(dt5);//格式化System.out.println(now.toString("yyyy-MM-dd HH:mm:ss"));DateTimeFormatter dateTimeFormatter = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss");DateTime dt6 = DateTime.parse("2020-8-20 7:22:45", dateTimeFormatter);System.out.println(dt6);System.out.println(dt6.toString("yyyy年MM月dd日 HH:mm:ss EE", Locale.CHINESE));//运算DateTime tomorrow = now.plusDays(1);System.out.println(tomorrow);DateTime lastMonth = now.minusMonths(1);System.out.println(lastMonth);System.out.println(Days.daysBetween(dt2, dt6));//获取值System.out.println(dt2.monthOfYear().isLeap()); //判断是否是闰年System.out.println(now.monthOfYear().getAsText());System.out.println(now.monthOfYear().getAsText(Locale.CHINA));System.out.println(now.dayOfWeek().getAsShortText());System.out.println(now.dayOfWeek().getAsShortText(Locale.CHINESE));}

工具类

package com.zykj.newsell.utils;import org.joda.time.*;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;
import org.springframework.util.StringUtils;import java.util.Date;/*** @author lc* @version 1.0* @date 2022/5/5 15:54*/
public class JodaTimeUtil {private static final String PATTERN_STANDARD = "yyyy-MM-dd HH:mm:ss";private static final String PATTERN_DATE = "yyyy-MM-dd";private static final String PATTERN_TIME = "HH:mm:ss";/*** date类型 -> string类型** @param date* @return*/public static String date2Str(Date date) {if (date == null) {return "";}DateTime dateTime = new DateTime(date);return dateTime.toString(PATTERN_STANDARD);}/*** date类型 -> string类型** @param date* @param formatPattern* @return*/public static String date2Str(Date date, String formatPattern) {if (date == null) {return "";}DateTime dateTime = new DateTime(date);return dateTime.toString(formatPattern);}/*** string类型 -> date类型** @param timeStr* @return*/public static Date str2Date(String timeStr) {DateTimeFormatter dateTimeFormatter = DateTimeFormat.forPattern(PATTERN_STANDARD);DateTime dateTime = dateTimeFormatter.parseDateTime(timeStr);return dateTime.toDate();}/*** 获取指定时间* @param year 年* @param month 月* @param day 日* @param hour 时* @param minute 分* @param seconds 秒* @return yyyy-MM-dd HH:mm:ss*/public static String getAssignedDateTime(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(PATTERN_STANDARD);return date;}/*** 获取指定日期* @param year* @param month* @param day* @return*/public static String getAssignedDate(Integer year, Integer month, Integer day) {LocalDate dt = new LocalDate(year, month, day);String date = dt.toString(PATTERN_DATE);return date;}/*** 获取指定时间* @param hour* @param minutes* @param seconds* @return*/public static String getAssignedTime(Integer hour, Integer minutes, Integer seconds) {LocalTime dt = new LocalTime(hour, minutes, seconds);String date = dt.toString(PATTERN_TIME);return date;}/*** 判断date日期是否过期(与当前时刻比较)** @param date* @return*/public static boolean isTimeExpired(Date date) {if (null == date) {return true;}String timeStr = date2Str(date);return isBeforeNow(timeStr);}/*** 判断date日期是否过期(与当前时刻比较)** @param timeStr* @return*/public static boolean isTimeExpired(String timeStr) {if (StringUtils.isEmpty(timeStr)) {return true;}return isBeforeNow(timeStr);}/*** 判断timeStr是否在当前时刻之前** @param timeStr* @return*/private static boolean isBeforeNow(String timeStr) {DateTimeFormatter format = DateTimeFormat.forPattern(PATTERN_STANDARD);DateTime dateTime = DateTime.parse(timeStr, format);return dateTime.isBeforeNow();}/*** 加天数** @param date* @param days* @return*/private static Date plusDays(Date date, Integer days) {if (null == date) {return null;}days = null == days ? 0 : days;DateTime dateTime = new DateTime(date);dateTime = dateTime.plusDays(days);return dateTime.toDate();}/*** 减天数** @param date* @param days* @return*/private static Date minusDays(Date date, Integer days) {if (null == date) {return null;}days = null == days ? 0 : days;DateTime dateTime = new DateTime(date);dateTime = dateTime.minusDays(days);return dateTime.toDate();}/*** 加分钟** @param date* @param minutes* @return*/private static Date plusMinutes(Date date, Integer minutes) {if (null == date) {return null;}minutes = null == minutes ? 0 : minutes;DateTime dateTime = new DateTime(date);dateTime = dateTime.plusMinutes(minutes);return dateTime.toDate();}/*** 减分钟** @param date* @param minutes* @return*/private static Date minusMinutes(Date date, Integer minutes) {if (null == date) {return null;}minutes = null == minutes ? 0 : minutes;DateTime dateTime = new DateTime(date);dateTime = dateTime.minusMinutes(minutes);return dateTime.toDate();}/*** 加月份** @param date* @param months* @return*/private static Date plusMonths(Date date, Integer months) {if (null == date) {return null;}months = null == months ? 0 : months;DateTime dateTime = new DateTime(date);dateTime = dateTime.plusMonths(months);return dateTime.toDate();}/*** 减月份** @param date* @param months* @return*/private static Date minusMonths(Date date, Integer months) {if (null == date) {return null;}months = null == months ? 0 : months;DateTime dateTime = new DateTime(date);dateTime = dateTime.minusMonths(months);return dateTime.toDate();}/*** 判断target是否在开始和结束时间之间** @param target* @param startTime* @param endTime* @return*/public static boolean isBetween(Date target, Date startTime, Date endTime) {if (null == target || null == startTime || null == endTime) {return false;}DateTime dateTime = new DateTime(target);return dateTime.isAfter(startTime.getTime()) && dateTime.isBefore(endTime.getTime());}/*** 获取当前系统时间* @return yyyy-MM-dd HH:mm:ss*/public static String getCurrentDateTime() {DateTime dt = new DateTime();String time = dt.toString(PATTERN_STANDARD);return time;}/*** 获取当前日期* @return*/public static String getCurrentDate() {DateTime dt = new DateTime();String date = dt.toString(PATTERN_DATE);return date;}/*** 获取系统当前时间按照指定格式返回* @return*/public static String getCurrentTime() {DateTime dt = new DateTime();String time = dt.toString(PATTERN_TIME);return time;}/*** 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 getWeek(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;}/*** 计算两个时间相差多少天* @param startDate* @param endDate* @return*/public 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);}
}