It's actually subtraction, not addition. I misspoke. It's the same calulation to determine the difference between integers, where one or both might be negative. start - end = delta. if you start at +1 and end at -5, 1 - -5 = 6. If you start at -9 and end at -4, -9 - -4 = -5.
cheers, barneyb On 8/30/05, Jim Davis <[EMAIL PROTECTED]> wrote: > > -----Original Message----- > > From: Paul Hastings [mailto:[EMAIL PROTECTED] > > Sent: Tuesday, August 30, 2005 3:20 PM > > To: CF-Talk > > Subject: Re: Timezone conversion > > > > > That's what I assumed... but I thought there must be some clever math to > > do > > > it without the interim conversion... > > > > add up the offsets first but pretty much the same thing. > > I'm a bear of very little brain today but I still don't see this... > > If the original zone is +1:00 and my zone is -4.00 adding them up gives me > -3:00 which isn't right... > > If I ignore the sign it works out to +5:00 (which is "correct" in that it's > the offset needed to convert the source zone to the target zone). > > But then if the original zone is -4:00 and the target zone is -5 I get > either 9:00 or -9:00. > > I'm just not seeing how adding up the offsets does it... > > I know this is something that should be immediately obvious... but I'm just > not having that light-bulb moment here. > > I think I'll just do the interim conversion for now... but it still seems > like there must be a simple formula for this. > > > > Ah well... that'll work. It's just not very elegant. > > > > it's not a problem that requires anything very elegant. it's run of the > > mill. managing the tz is the real issue. ask isaac ;-) > > Yeah... I'm just fried today. Only a few hours of sleep for the past few > nights. ;^) > > Jim Davis > -- Barney Boisvert [EMAIL PROTECTED] 360.319.6145 http://www.barneyb.com/ Got Gmail? I have 100 invites. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Find out how CFTicket can increase your company's customer support efficiency by 100% http://www.houseoffusion.com/banners/view.cfm?bannerid=49 Message: http://www.houseoffusion.com/lists.cfm/link=i:4:216871 Archives: http://www.houseoffusion.com/cf_lists/threads.cfm/4 Subscription: http://www.houseoffusion.com/lists.cfm/link=s:4 Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=11502.10531.4 Donations & Support: http://www.houseoffusion.com/tiny.cfm/54
