14 java 日期处理 joda-time

http://www.joda.org/joda-time/

任何企业应用程序都需要处理时间问题。应用程序需要知道当前的时间点和下一个时间点，有时它们还必须计算这两个时间点之间的路径。使用 JDK 完成这项任务将非常痛苦和繁琐。现在来看看 Joda Time，一个面向 Java™ 平台的易于使用的开源时间/日期库。正如您在本文中了解的那样，Joda-Time 轻松化解了处理日期和时间的痛苦和繁琐

 pom依赖：

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

后续补充

import org.joda.time.DateTime;

/**
 */
public class Example2 {
    public static final String FORMAT_DATE_WEEK_MS="E MM/dd/yyyy HH:mm:ss.SSS";
    public static final String FORMAT_DATE_MS="yyyy/MM/dd HH:mm:ss.SSS";
    public static final String FORMAT_DATE_S="yyyy/MM/dd HH:mm:ss";
    //按照format格式打印时间
    public static void displayDate(DateTime dateTime,String format){
        String timeStr=dateTime.toString(format);
        System.out.println(timeStr);
    }
    public static void main(String[] args) {
        //一、创建一个时间点
        DateTime dateTime1=new DateTime(2016,8,4,19,19,40,12);//年，月，日，时，分，秒，毫秒
        displayDate(dateTime1,FORMAT_DATE_MS);
        displayDate(dateTime1,FORMAT_DATE_S);
        displayDate(dateTime1,FORMAT_DATE_WEEK_MS);
        //这种填写参数方法至少填写到小时,否则要填写long型的时间戳
        dateTime1=new DateTime(2016,8,4,19,19);
        displayDate(dateTime1,FORMAT_DATE_S);
    }
}

import org.joda.time.DateTime;
import org.joda.time.Days;
import org.joda.time.LocalDate;
import org.joda.time.Period;

import java.util.Locale;

/**
 */
public class Example1 {
    //DateTime 时间+日期
    public static boolean isAfterPayDay(DateTime datetime) {
        if (datetime.getMonthOfYear() == 2) {   // February is month 2!!
            return datetime.getDayOfMonth() > 26;
        }
        return datetime.getDayOfMonth() > 1;
    }

    public static void isAfterPayDayTest(){
        DateTime dateTime=new DateTime();

        System.out.println(isAfterPayDay(dateTime));
        System.out.println(dateTime.toDate());
    }
    //LocalDate  日期 没有时间
    public static Days daysToNewYear(LocalDate fromDate) {
        LocalDate newYear = fromDate.plusYears(1).withDayOfYear(1);
        System.out.println(newYear.toDate());
        newYear = fromDate.plusYears(1);
        System.out.println(newYear.toDate());
        return Days.daysBetween(fromDate, newYear);
    }

    public static void daysToNewYearTest()
    {
        LocalDate date=new LocalDate();
        System.out.println(daysToNewYear(date));
    }

    //Period 进行时间加减
    public static boolean isRentalOverdue(DateTime datetimeRented) {
        Period rentalPeriod = new Period().withDays(2).withHours(12);
        System.out.println(datetimeRented);
        System.out.println(datetimeRented.toDateTime());
        System.out.println(datetimeRented.plus(rentalPeriod).toDateTime());
        return datetimeRented.plus(rentalPeriod).isBeforeNow();
    }

    public static void isRentalOverdueTest(){
        DateTime dateTime=new DateTime();
        System.out.println(isRentalOverdue(dateTime));
    }


    public static String getBirthMonthText(LocalDate dateOfBirth) {
        System.out.println(dateOfBirth.monthOfYear().getAsString());
        return dateOfBirth.monthOfYear().getAsText(Locale.ENGLISH);
    }

    public static void getBirthMonthTextTest(){
        LocalDate date=new LocalDate();
        System.out.println(getBirthMonthText(date));
    }

    public static void main(String[] args) {
        System.out.println("test1  ******************");
        isAfterPayDayTest();
        System.out.println("test2  ******************");
        daysToNewYearTest();
        System.out.println("test3  ******************");
        isRentalOverdueTest();
        System.out.println("test4  ******************");
        getBirthMonthTextTest();
    }
}