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Re: Java date questions
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Re: Java date questions


  • Subject: Re: Java date questions
  • From: email@hidden
  • Date: Thu, 30 Oct 2003 11:17:20 CDT
  • Priority: 3 (Normal)

[demime could not interpret encoding binary - treating as plain text]
Ooops, and here's Pierre suggesting that even though
NSTimestamp.timestampByAddingGregorianUnits _isn't_ deprecated (I thought
it was, but it's not!), Pierre says it _ought_ to be deprecated, cause
it's broken, and you _should_ use GregorianCalendar for manipulation instead.

Although, implied by Pierre's code, is that the NSTimestamp 7-argument
constructor (which I thought was deprecated too, but also is NOT
deprecated) works fine.

Man, this stuff is so confusing.  It's not really WO's fault;  Java is
confusing enough when dealing with date/times already.  But adding one
extra class (NSTimestamp) on to everything else doesn't help much.

--Jonathan

On Thu, 30 Oct 2003 10:35:39 +0100 "Pierre Bernard" wrote:

> Jonathan,
>
> Here's a handy utility method:
>
> 	/** Adds time to a date.<BR>
> 	 * This utility method replaces NSTimestamp.
> 	 * timestampByAddingGregorianUnits() which does all its computations
> in the
> 	 * GMT timezone. This leads to several problems. For one DST changes
> don't
> 	 * happen as expected. Adding 1 month to a CET midnight of a first of a
> 	 * month does not bring us to the first of the next month, but only
> as many
> 	 * days further as there are days in the preceeding month.
> 	 *
> 	 * @param		date				the original timestamp or date
> 	 * @param		year				number of years to add
> 	 * @param		month				number of months to add
> 	 * @param		day				number of days to add
> 	 * @param		hour				number of hours to add
> 	 * @param		minute 			number of minutes to add
> 	 * @param		second			number of seconds to add
> 	 *
> 	 * @return		a new date corresponding to original date to which we
> add specified time.
> 	**/
> 	public static NSTimestamp timestampByAddingGregorianUnits(
> 		Date date,
> 		int year,
> 		int month,
> 		int day,
> 		int hour,
> 		int minute,
> 		int second)
> 	{
> 		GregorianCalendar calendar = new GregorianCalendar();
>
> 		calendar.setTime(date);
>
> 		return new NSTimestamp(
> 			calendar.get(GregorianCalendar.YEAR) + year,
> 			calendar.get(GregorianCalendar.MONTH) + month + 1,
> 			calendar.get(GregorianCalendar.DAY_OF_MONTH) + day,
> 			calendar.get(GregorianCalendar.HOUR_OF_DAY) + hour,
> 			calendar.get(GregorianCalendar.MINUTE) + minute,
> 			calendar.get(GregorianCalendar.SECOND) + second,
> 			TimeZone.getDefault());
> 	}
>
> Pierre.
>
> --
> Got a hang for movies?
> http://homepage.mac.com/I_love_my/movies.html
>
> -----Original Message-----
> From: email@hidden [mailto:email@hidden]
> Sent: Thursday, October 30, 2003 12:58 AM
> To: email@hidden
> Subject: Java date questions
>
>
> [demime could not interpret encoding binary - treating as plain text]
> This isn't a WO question, it's more of a Java question, but I can't seem
> to figure it out anywhere.
>
> I have an NSTimestamp. I want to subtract seven days from it. If it's
> September 10, I want to end up with September 3.  If it's September 1, I
> want to end up with October 25.
>
> I probably am gonna want to convert the NSTimestamp to a
> GregorianCalendar first. Fair enough.  But I can't figure out what
> methods to call on the GregorianCalendar to do this date subtraction.
>
> --Jonathan
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