Groups > comp.lang.java.programmer > #18577

Re: Date/Calendar confusion

Path	csiph.com!usenet.pasdenom.info!aioe.org!.POSTED!not-for-mail
From	"John B. Matthews" <nospam@nospam.invalid>
Newsgroups	comp.lang.java.programmer
Subject	Re: Date/Calendar confusion
Date	Thu, 06 Sep 2012 20:53:48 -0400
Organization	The Wasteland
Lines	37
Message-ID	<nospam-D06BA0.20534806092012@news.aioe.org> (permalink)
References	<3a69eb4a-f3c0-4b56-9a67-6833ccb2a1c8@googlegroups.com>
NNTP-Posting-Host	LQJtZWzu+iKlBROuDg+IUg.user.speranza.aioe.org
Mime-Version	1.0
Content-Type	text/plain; charset=UTF-8
Content-Transfer-Encoding	7bit
X-Complaints-To	abuse@aioe.org
User-Agent	MT-NewsWatcher/3.5.3b3 (Intel Mac OS X)
X-Notice	Filtered by postfilter v. 0.8.2
Xref	csiph.com comp.lang.java.programmer:18577

Show key headers only | View raw

In article <3a69eb4a-f3c0-4b56-9a67-6833ccb2a1c8@googlegroups.com>,
 Ulrich Scholz <d7@thispla.net> wrote:

> calendar2.set(Calendar.YEAR, calendar2.get(Calendar.YEAR) + 1970);
> calendar2.set(Calendar.MONTH, calendar2.get(Calendar.MONTH) + 1);
> calendar2.set(Calendar.DAY_OF_MONTH,
>      calendar2.get(Calendar.DAY_OF_MONTH) + 1);

Note that Calendar.JANUARY is not 1. Use clear() to set some or all 
fields to a known (undefined, !isSet()) state.

public static void main(String[] args) {
    TimeZone timeZone = TimeZone.getTimeZone("GMT");
    SimpleDateFormat f = new SimpleDateFormat(
        "yyyy-MMM-dd HH:mm:ss.SSS Z");

    Calendar calendar1 = Calendar.getInstance(timeZone);
    System.out.println(f.format(calendar1.getTime()));
    calendar1.clear();
    System.out.println(calendar1.getTimeInMillis()); // 0

    Calendar calendar2 = Calendar.getInstance(timeZone);
    System.out.println(f.format(calendar2.getTime()));
    calendar2.set(Calendar.YEAR, 1970);
    calendar2.set(Calendar.MONTH, Calendar.JANUARY);
    calendar2.set(Calendar.DAY_OF_MONTH, 1);
    calendar2.clear(Calendar.HOUR);
    calendar2.clear(Calendar.MINUTE);
    calendar2.clear(Calendar.SECOND);
    calendar2.clear(Calendar.MILLISECOND);
    System.out.println(calendar2.getTimeInMillis()); // 0
}

-- 
John B. Matthews
trashgod at gmail dot com
<http://sites.google.com/site/drjohnbmatthews>

Thread

Date/Calendar confusion Ulrich Scholz <d7@thispla.net> - 2012-09-06 01:03 -0700
  Re: Date/Calendar confusion nogales <nogales.manuel@gmail.com> - 2012-09-06 02:29 -0700
  Re: Date/Calendar confusion Lew <lewbloch@gmail.com> - 2012-09-06 10:21 -0700
  Re: Date/Calendar confusion "John B. Matthews" <nospam@nospam.invalid> - 2012-09-06 20:53 -0400
    Re: Date/Calendar confusion Lew <lewbloch@gmail.com> - 2012-09-07 11:01 -0700
      Re: Date/Calendar confusion "John B. Matthews" <nospam@nospam.invalid> - 2012-09-07 21:02 -0400
        Re: Date/Calendar confusion Lew <lewbloch@gmail.com> - 2012-09-07 18:44 -0700
          Re: Date/Calendar confusion "John B. Matthews" <nospam@nospam.invalid> - 2012-09-08 09:12 -0400
            Re: Date/Calendar confusion Lew <lewbloch@gmail.com> - 2012-09-08 16:51 -0700

csiph-web