java字符串到日期时间的转换问题
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java string to datetime conversion issue
提问by Gern Blanston
I can't seem to see the problem with the example code below. For some reason seems to be ignoring the year and saying the dates are the same, as can be seen in the output below. I must be missing something simple.
我似乎看不到下面示例代码的问题。出于某种原因，似乎忽略了年份并说日期相同，如下面的输出所示。我一定错过了一些简单的东西。
01/28/2006
01/16/2007
Tue Apr 01 00:00:00 PDT 2008
Tue Apr 01 00:00:00 PDT 2008
done
01/28/2006
01/16/2007
星期二 01 00:00:00 PDT 2008
星期二 01 00:00:00 PDT 2008
完成
import java.util.*;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
class ExampleProgram {
public static void main(String[] args){
DateFormat df = new SimpleDateFormat("dd/MM/yyyy");
String d1String = "01/28/2006";
String d2String = "01/16/2007";
System.out.println(d1String);
System.out.println(d2String);
Date d1=null;
try {
d1 = df.parse(d1String);
} catch (ParseException e) {
System.out.println(e.getMessage());
}
Date d2=null;
try {
d2 = df.parse(d2String);
} catch (ParseException e) {
System.out.println(e.getMessage());
}
System.out.println(d1);
System.out.println(d2);
System.out.println("done");
}
}
采纳答案by Peter
"dd/MM/yyyy"
should read:
应该读：
"MM/dd/yyyy"
回答by Nico Heid
as Peter mentioned, the meaning of the letters can be found in the documentation here: http://java.sun.com/j2se/1.4.2/docs/api/java/text/SimpleDateFormat.html
正如彼得提到的，字母的含义可以在这里的文档中找到：http: //java.sun.com/j2se/1.4.2/docs/api/java/text/SimpleDateFormat.html
回答by Jeremy Cron
The reason that it wasn't giving you what you expected is like Peter said the SimpleDateFormatshould read "MM/dd/yyyy"
The reason that the result is saying that they appear to be equal is because with the format that you've given it "dd/MM/yyyy", d1String's Month is 28. It is taking 28 - 12, adding a year, 16 - 12, adding another year, and the result is 4 (April) and the year is now 2008. Same thing for d2String.
它没有给你你期望
的原因就像彼得说SimpleDateFormat应该读"MM/dd/yyyy"
结果是说它们看起来相等的原因是因为按照你给它的格式"dd/MM/yyyy"，d1String's Month 是 28。它需要 28 - 12，加上一年，16 - 12，再加一年，结果是 4（四月），现在是 2008 年。 . 同样的事情d2String。
