Re: Date question
This WebDNA talk-list message is from 2003
It keeps the original formatting.
numero = 53293
interpreted = N
texte = John, Thanks for the quick reply; I completely understand the concept you outlined below. I pulled the missing days thing from "man cal": "The Gregorian Reformation is assumed to have occurred in 1752 on the 3rd of September. By this time, most countries had recognized the reforma- tion (although a few did not recognize it until the early 1900's.) Ten days following that date were eliminated by the reformation, so the cal- endar for that month is a bit unusual." [dude:~] dude% cal 9 1752 September 1752 S M Tu W Th F S 1 2 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 andy On Tuesday, October 7, 2003, at 03:17 PM, John Hill wrote: > Your leap year calculation isn't right. I'm not familiar with the 11 > missing days for the Gregorian Reformation so those are not be part of > the calculation. Frankly, I've never seen a date calculator (common > one) that had the 11 days whacked (I might be wrong, it's been a long > time since I did this). Here's how it works: > > 2003 x 365 - base days up to 2003 > + 280 days - days from jan 1 > + floor(2003/4) - leap days since start (partial calc) > - floor(2003/100) - subtract leap day at century markers (partial > calc) > + floor(2003/400) - add leap day at century if multiple of 400 > >> Hi! >> >> I'm trying to implement an timestamp function and have a question. >> What does the numerical result of [math]{[date]}[/math] represent? >> On my US Mac with a date of 10/07/2003, I get 731860. This is almost >> the number of days since year 01/01/0000, but not quite.... >> >> Regular Year: 731860/365=2005.096 >> Including Leap Years: 731860/365.25=2003.723 >> Including Leap Years and 11 days missing due to the Gregorian >> Reformation (731860+11)/365.25=203.754 >> >> Oct. 7, 2003 is the 280th day of the year: 280/365.25=0.7665982 >> >> Thanks, >> >> Andy ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list
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John, Thanks for the quick reply; I completely understand the concept you outlined below. I pulled the missing days thing from "man cal": "The Gregorian Reformation is assumed to have occurred in 1752 on the 3rd of September. By this time, most countries had recognized the reforma- tion (although a few did not recognize it until the early 1900's.) Ten days following that date were eliminated by the reformation, so the cal- endar for that month is a bit unusual." [dude:~] dude% cal 9 1752 September 1752 S M Tu W Th F S 1 2 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 andy On Tuesday, October 7, 2003, at 03:17 PM, John Hill wrote: > Your leap year calculation isn't right. I'm not familiar with the 11 > missing days for the Gregorian Reformation so those are not be part of > the calculation. Frankly, I've never seen a date calculator (common > one) that had the 11 days whacked (I might be wrong, it's been a long > time since I did this). Here's how it works: > > 2003 x 365 - base days up to 2003 > + 280 days - days from jan 1 > + floor(2003/4) - leap days since start (partial calc) > - floor(2003/100) - subtract leap day at century markers (partial > calc) > + floor(2003/400) - add leap day at century if multiple of 400 > >> Hi! >> >> I'm trying to implement an timestamp function and have a question. >> What does the numerical result of [math]{[date]}[/math] represent? >> On my US Mac with a date of 10/07/2003, I get 731860. This is almost >> the number of days since year 01/01/0000, but not quite.... >> >> Regular Year: 731860/365=2005.096 >> Including Leap Years: 731860/365.25=2003.723 >> Including Leap Years and 11 days missing due to the Gregorian >> Reformation (731860+11)/365.25=203.754 >> >> Oct. 7, 2003 is the 280th day of the year: 280/365.25=0.7665982 >> >> Thanks, >> >> Andy ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://webdna.smithmicro.com/
andy mowrey
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