Java time operation library: Joda-Time

Introduction

Joda is a java processing time library that requires the support of jdk8 and is java.time (JSR-310).

From

I accidentally learned spring’s documentation today (9.6.2 Annotation-driven Formatting ) of the Formatter source code, I found this time class library. Since some functions of spring also rely on this class library, I decided to take a look at what's going on

function

directly compare with the current time isAfterNow/isBeforeNow/isEqualNow

Return Date/Calendar toDate/toCalendar

Time calculation, plus year/month/day/hour minutes and seconds plusYears/plusMonths/plusDays

Time zone setting withZone

Common functions

 dt.getEra();
 dt.getYear();//获取当前年
 dt.getWeekyear();
 dt.getCenturyOfEra();
 dt.getYearOfEra();//世纪年
 dt.getYearOfCentury();
 dt.getMonthOfYear();//获取月份
 dt.getWeekOfWeekyear();//这周是今年的第几周
 dt.getDayOfYear();//这天是今年的第几天
 dt.getDayOfMonth();//月份的多少好
 dt.getDayOfWeek();//一个星期的第几天

Depends on

<dependency>
  <groupId>joda-time</groupId>
  <artifactId>joda-time</artifactId>
  <version>2.9.4</version></dependency>

example code

JodaTime Test. java

package com.carl.spring.hello.bean;import org.joda.time.DateTime;import org.joda.time.Duration;import org.joda.time.Period;import org.joda.time.format.DateTimeFormatter;import org.joda.time.format.DateTimeFormatterBuilder;import org.junit.Test;import java.util.Date;import java.util.Locale;/**
 * @author Carl
 * @date 2016/9/2
 */public class JodaTimeTest {    @Test
    public void dateTimeTest() {        //2016/9/2
        //当前时间
        java.util.Date juDate = new Date();        //如果无参，也默认是当前时间的
        DateTime dt = new DateTime(juDate);

        show(dt);
    }    @Test
    public void dateTimeChange() {
        DateTime dt = new DateTime();        //把年改为2000年的
        DateTime year2000 = dt.withYear(2000);        //时间加两个小时
        DateTime twoHoursLater = dt.plusHours(2);
        show(dt);//2016-9-2 0:16
        show(year2000);//2000-9-2 0:16
        show(twoHoursLater);//2016-9-2 2:16
    }    @Test
    public void dateTimeText() {
        DateTime dt = new DateTime();
        String monthName = dt.monthOfYear().getAsText();        //根据地区获取Text
        String frenchShortName = dt.monthOfYear().getAsShortText(Locale.CHINA);        boolean isLeapYear = dt.year().isLeap();
        DateTime rounded = dt.dayOfMonth().roundFloorCopy();
        System.out.println(monthName);
        System.out.println(frenchShortName);
        System.out.println(isLeapYear);        //月份的最后一天
        System.out.println(dt.dayOfMonth().getMaximumValue());
        show(rounded);
    }    @Test
    public void dateTimeArgs() {        //实例就能够确定年月日时分秒
        DateTime dt = new DateTime(2005, 3, 26, 12, 0, 0, 0);        //这里能够进行时间的计算，plus就是加了，周期肯定是那个接口的，里面肯定也有年月日时分秒
        DateTime plusPeriod = dt.plus(Period.days(1));
        DateTime plusDuration = dt.plus(new Duration(24L*60L*60L*1000L));
        show(dt);//2005-3-26 12:0
        //减一天
        show(dt.plusDays(-1));//2005-3-25 12:0
        show(plusPeriod);//2005-3-27 12:0
        show(plusDuration);//2005-3-27 12:0
    }    @Test
    public void dataTimeFormat() {
        DateTimeFormatter fmt = new DateTimeFormatterBuilder()
                .appendDayOfMonth(1)
                .appendLiteral('-')
                .appendMonthOfYearShortText()
                .appendLiteral('-')
                .appendTwoDigitYear(1956)  // pivot = 1956
                .toFormatter();
        DateTime dt = new DateTime();
        System.out.println(dt.toString(fmt));//2-九月-16
    }    private void show(DateTime dateTime) {
        System.out.println(dateTime.getYear() + "-" + dateTime.getMonthOfYear() + "-" + dateTime.getDayOfMonth() + " " + dateTime.getHourOfDay() + ":" + dateTime.getMinuteOfHour());
    }
}