The root problem here is the assumption that a day is always 24 hours. In timezones that support DST, a day can actually be 23, 24, or 25 hours long. Your posted code is adding 24-hour periods to a given date, so assuming you want to keep it that way you can just add the difference between the timezone offsets of the two dates to your projected date:
tday = new Date(2006,9,16,22,49,18,0); res = new Date(tday.getTime() + 16*24*60*60*1000); test = new Date(2006,10,1,22,49,18,0); test.setTime(test.getTime() + (tday.getTimezoneOffset() - res.getTimezoneOffset()) * 60000); assertTrue( "Test: 16 via addDays(),\nNeed: 2006-11-01 22:49:18 (plus or minus 1 hour due to DST)\nComp: "+res+"\nTest: "+test+"\n", res.getTime()==test.getTime()); --- In [email protected], "Mike Crowe" <[EMAIL PROTECTED]> wrote: > > Dude, you may be my new hero. I need to figure out how to handle > this. > > Anybody coded for DST before? Pointers? > > Mike > > --- In [email protected], "Pekka Kola" pekka.kola@ > wrote: > > > > Daylight saving time btw Oct 16 .. Nov 1?? > > > > BR, Pekka > > > > -----Original Message----- > > From: [email protected] > [mailto:[EMAIL PROTECTED] On > > Behalf Of Mike Crowe > > Sent: 17. lokakuuta 2006 6:32 > > To: [email protected] > > Subject: [flexcoders] Bug in Date() class math > > > > Hi folks, > > > > I submitted this bug to Adobe today. I was trying to figure out > why > > my Date routines wouldn't work. Here's a test function which fails: > > > > The following code appears to mis-compute the result date. This is > > adding 16 days to the current date: > > > > public function testMike():void { > > var tday:Date; > > var res:Date; > > var test:Date; > > > > tday = new Date(2006,9,16,22,49,18,0); > > res = new Date(tday.getTime() + 16*24*60*60*1000); > > test = new Date(2006,10,1,22,49,18,0); > > assertTrue( "Test: 16 via addDays(),\nNeed: 2006-11-01 > > 22:49:18\nComp: "+res+"\nTest: "+test+"\n", res==test); > > > > } > > > > Results: > > > > Error: Test: 16 via addDays(), > > Need: 2006-11-01 22:49:18 > > Comp: Wed Nov 1 21:49:18 GMT-0500 2006 > > Test: Wed Nov 1 22:49:18 GMT-0500 2006 > > - expected true but was false > > > > > > My unit-test goes from 1-100 days (by 5), All dates below 16 days > > work. > > > > Anybody else see this? > > TIA > > Mike > > > > > > > > > > > > -- > > Flexcoders Mailing List > > FAQ: http://groups.yahoo.com/group/flexcoders/files/ > flexcodersFAQ.txt > > Search Archives: http://www.mail-archive.com/ > flexcoders%40yahoogroups.com > > Yahoo! Groups Links > > > -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/flexcoders/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/flexcoders/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
