java获取指定时间的年月日

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1. java 7 及之前版本
1.1 使用 java.util.Calendar （不推荐）

import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;public class Demo {    public static void main(String[] args) throws ParseException {        Date date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse("2015-09-17 20:27:00");        Calendar now = Calendar.getInstance();        now.setTime(date);                int year = now.get(Calendar.YEAR);        int month = now.get(Calendar.MONTH) + 1; // 0-based!        int day = now.get(Calendar.DAY_OF_MONTH);        System.out.println("year: " + year);        System.out.println("month: " + month);        System.out.println("day: " + day);    }}

结果如下：

year: 2015month: 9day: 17

1.2 joda-time （推荐）

import org.joda.time.LocalDate;import org.joda.time.format.DateTimeFormat;import org.joda.time.format.DateTimeFormatter;public class Demo {    public static void main(String[] args) {        DateTimeFormatter formatter = DateTimeFormat.forPattern("YYYY-MM-dd HH:mm:ss");        LocalDate localDate = formatter.parseLocalDate("2015-09-17 20:27:00");        System.out.println("yearOfCentury: " + localDate.getYearOfCentury());        System.out.println("monthOfYear: " + localDate.getMonthOfYear());        System.out.println("dayOfMonth: " + localDate.getDayOfMonth());    }}

结果如下：

yearOfCentury: 15monthOfYear: 9dayOfMonth: 17

2. java 8，直接使用 new datetime api （推荐！！）

import java.time.LocalDateTime;import java.time.format.DateTimeFormatter;public class Demo {    public static void main(String[] args) {        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");        LocalDateTime ldt = LocalDateTime.parse("2015-09-17 20:27:00", formatter);        System.out.println("Year: " + ldt.getYear());        System.out.println("Month: " + ldt.getMonth().getValue());        System.out.println("DayOfMonth: " + ldt.getDayOfMonth());    }}

结果如下：

Year: 2015Month: 9DayOfMonth: 17

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