使用 SimpleDateFormat 进行日期格式化
java programming java8object oriented programming
SimpleDateFormat 是一个具体的类，用于以区域敏感的方式格式化和解析日期。SimpleDateFormat 允许您从选择任何用户定义的日期时间格式模式开始。
示例
import java.util.*;
import java.text.*;
public class DateDemo {
public static void main(String args[]) {
Date dNow = new Date( );
SimpleDateFormat ft =
new SimpleDateFormat ("E yyyy.MM.dd 'at' hh:mm:ss a zzz");
System.out.println("Current Date: " + ft.format(dNow));
}
}
这将产生以下结果 −
输出
Current Date: Sun 2004.07.18 at 04:14:09 PM PDT
简单 DateFormat 格式代码
要指定时间格式，请使用时间模式字符串。在此模式中，所有 ASCII 字母均保留为模式字母，定义如下
| 字符 | 描述 | 示例 |
|---|---|---|
| G | Era designator | AD |
| y | Year in four digits | 2001 |
| M | Month in year | July or 07 |
| d | Day in month | 10 |
| h | An hour in A.M./P.M. (1~12) | 12 |
| H | An hour in a day (0~23) | 22 |
| m | Minute in hour | 30 |
| s | Second in minute | 55 |
| S | Millisecond | 234 |
| E | Day in week | Tuesday |
| D | Day in year | 360 |
| F | Day of week in the month | 2 (second Wed. in July) |
| w | Week in year | 40 |
| W | Week in month | 1 |
| a | A.M./P.M. marker | PM |
| k | An hour in a day (1~24) | 24 |
| K | Hour in A.M./P.M. (0~11) | 10 |
| z | Time zone | Eastern Standard Time |
| ' | Escape for text | Delimiter |
" | Single quote | ` |
