Fwd: About "org.apache.commons.lang.time.DateUtils.getFragmentInHours ()" method

[Gary Gregory <GG...@seagullsoftware.com>]

Begin forwarded message:

From: lupeng0527 <lu...@163.com>>
Date: July 6, 2011 21:53:55 EDT
To: sergek <se...@lokitech.com>>, ggregory <gg...@seagullsw.com>>
Subject: About "org.apache.commons.lang.time.DateUtils.getFragmentInHours ()" method

Hello  Serge Knystautas, Gary Gregory:

I'm Lupeng.I come from China.I'm not good at English.If you do not understand, like him to forgive.
I like the Apache Software. But when I was learning commons-lang-2.5.jar,I encountered a problem.

Problem Description:
org.apache.commons.lang.time.DateUtils.getFragmentInHours(),
API(<http://commons.apache.org/lang/api-2.5/index.html>http://commons.apache.org/lang/api-2.5/index.html): static long getFragmentInHours(Calendar calendar, int fragment) method

My Example:
----------------------------------------------------------------------------------
Calendar c = Calendar.getInstance();
long h = DateUtils.getFragmentInHours(cal, Calendar.MONTH);
String s = DateFormatUtils.format(cal, "yyyy-MM-dd HH:mm:ss");
System.out.println(s + "\t" + h);

// The results:
time: 2011-07-07 09:24:13 hour: 177
// However, after calculation, the results should not be a 177, the result is  (6*24+9)=153
-----------------------------------------------------------------------------------


API example of official website:
-----------------------------------------------------------------------------------
// 2008-01-01 07:15:10
January 1, 2008 7:15:10.538 with Calendar.MONTH as fragment will return 7

// The results:  7
-----------------------------------------------------------------------------------


When I use, the result is not the same:
-----------------------------------------------------------------------------------
// Set Time
Calendar c2 = Calendar.getInstance();
c2.set(Calendar.YEAR, 2008);
c2.set(Calendar.MONTH, 00);
c2.set(Calendar.DAY_OF_MONTH, 01);
c2.set(Calendar.HOUR_OF_DAY, 7);
c2.set(Calendar.MINUTE, 15);
c2.set(Calendar.SECOND, 10);
c2.set(Calendar.MILLISECOND, 538);

long h2 = DateUtils.getFragmentInHours(c2, Calendar.MONTH);
String s2 = DateFormatUtils.format(c2, "yyyy-MM-dd HH:mm:ss.SSS");
System.out.println("time: " + s2 + "\thour:" + h2);

// The results:
time: 2008-01-01 07:15:10.538  hour:31
// Same period of time, but the results of different
-----------------------------------------------------------------------------------

Explanation:

I do not know my program is correct.
If the program is incorrect, please point it out!
If the program is correct,my results with the API results different. So special to ask!
Thank you,Waiting for your reply (please be concise language when you reply).

Personal information:

Name: Lupeng
E-mail: <ma...@163.com> lupeng0527@163.com<ma...@163.com>
MSN: <ma...@msn.com> luepng0527@msn.com<ma...@msn.com>
Address: Beijing, China

2011-07-07
________________________________
lupeng0527

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