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Re: NSCalendar bug with adding to pre-1919 dates?
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Re: NSCalendar bug with adding to pre-1919 dates?


  • Subject: Re: NSCalendar bug with adding to pre-1919 dates?
  • From: Brett Powley <email@hidden>
  • Date: Wed, 1 Mar 2006 17:44:02 +1100

Daylight savings perhaps? Summer DST began for the first time in the US on March 31 1918, which is right in the middle of where your weirdness happens...

On 01/03/2006, at 10:06 AM, Ben Kazez wrote:

I have an application that retrieves an NSCalendarDate from a .ics file and adds one year to it until the date is within a certain range. (This isn't the most efficient way to do things, but it's fast enough for my needs.) This algorithm runs into a problem with dates before 1919. Here's the line that adds the date components:

currentExpandedDate = [[IEPSystemCalendar dateByAddingComponents:frequency toDate:currentExpandedDate options: 0] dateWithCalendarFormat:BKWebScriptCalendarFormat timeZone: [[unexpandedEvent objectForKey:@"DTSTART"] timeZone]];

The frequency variable is set to one year using -[NSDateComponents setYear:]. As an example, here the app is starting with 1914-03-01 00:00:00 -0600:

March 01, 1915 00:00:00
March 01, 1916 00:00:00
March 01, 1917 00:00:00
March 01, 1918 00:00:00
March 01, 1919 01:00:00
March 01, 1920 01:00:00
...

(Sorry for the inconsistent date formatting.) As you can see, after 1918, the date is one hour off. Does anyone know why this is happening?

Ben

-------------------------------------------------------------- Brett Powley -- PhD Candidate Centre for Language Technology, Macquarie University, Australia p: +61-402-013050 f: +61-2-90120813 e: email@hidden faciendi plures libros nullus est finis frequensque meditatio carnis adflictio est --------------------------------------------------------------



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References: 
 >NSCalendar bug with adding to pre-1919 dates? (From: Ben Kazez <email@hidden>)

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