Re: Date as number and Cart partially explained
This WebDNA talk-list message is from 2001
It keeps the original formatting.
numero = 38802
interpreted = N
texte = Brian B. Burton wrote:> > The first 11 digits of the [cart] are based on the time. I haven't decoded> how it encodes the time... It seems to be accurate to the ticks of the clock> of the computer (on the mac this is 1/60th of a sec; how this relates> NT/Linux, I don't know) it's always divisible by 2, I'll keep factoring to> find the constant when I get a chance. (code at bottom for those who like to> play)NT typically measures time in either seconds or milliseconds (dependingon which API you call). All of my carts are now 16 digits long, so under NT, I would suspect that the first 13 digits are milliseconds since the epoch ( midnight (00:00:00), January 1, 1970 ).10 digits are currently required to represent the number of seconds since the epoch, see http://www.james.rcpt.to/2001/epoch/for more details. On the Mac, the ticks are more granular, so it uses 11 digits: 10 + number of 1/60th's (which will always be even).HTHJohn-- John PeacockDirector of Information Research and TechnologyRowman & Littlefield Publishing Group4720 Boston WayLanham, MD 20706301-459-3366 x.5010fax 301-429-5747-------------------------------------------------------------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://search.smithmicro.com/
Associated Messages, from the most recent to the oldest:
|
- Re: Date as number and Cart partially explained (John Peacock 2001)
|
Brian B. Burton wrote:> > The first 11 digits of the [cart] are based on the time. I haven't decoded> how it encodes the time... It seems to be accurate to the ticks of the clock> of the computer (on the mac this is 1/60th of a sec; how this relates> NT/Linux, I don't know) it's always divisible by 2, I'll keep factoring to> find the constant when I get a chance. (code at bottom for those who like to> play)NT typically measures time in either seconds or milliseconds (dependingon which API you call). All of my carts are now 16 digits long, so under NT, I would suspect that the first 13 digits are milliseconds since the epoch ( midnight (00:00:00), January 1, 1970 ).10 digits are currently required to represent the number of seconds since the epoch, see http://www.james.rcpt.to/2001/epoch/for more details. On the Mac, the ticks are more granular, so it uses 11 digits: 10 + number of 1/60th's (which will always be even).HTHJohn-- John PeacockDirector of Information Research and TechnologyRowman & Littlefield Publishing Group4720 Boston WayLanham, MD 20706301-459-3366 x.5010fax 301-429-5747-------------------------------------------------------------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://search.smithmicro.com/
John Peacock
DOWNLOAD WEBDNA NOW!
Top Articles:
Talk List
The WebDNA community talk-list is the best place to get some help: several hundred extremely proficient programmers with an excellent knowledge of WebDNA and an excellent spirit will deliver all the tips and tricks you can imagine...
Related Readings:
[subtotal] problems -- help? (1998)
[addlineitems] display (1997)
Forms Search Questions (1997)
possible, WebCat2.0 and checkboxes-restated (1997)
[convertchars] problem... (2000)
Nested vs conditional (1997)
Bounced Emails (2005)
Smith Micro Site (2000)
2nd WebCatalog2 Feature Request (1996)
Code sample - links.tpl (2002)
Database Changes (2000)
Sendmail and textarea (1998)
test (2003)
Frames and WebCat (1997)
referrer usage (1997)
[WebDNA] Bug in [thisurlplusget] on v7 (2011)
WebCat2b13MacPlugIn - [shownext method=post] ??? (1997)
multi-paragraph fields (1997)
WebCatalog seems to choke on large (2meg) html files. (1998)
WebCat b13 CGI -shownext- (1997)