PR更新周期表_确定PR的更新时间(转)

在点石看到这篇文章，蛮详细的，对之前的PR更新时间都有记录，只是不知道这能不能做为一个依据，暂且不管吧，发来供大家查阅，希望有所帮助！

Year	Date	Info	Days
2009	Waiting	TBPR Export Estimation Jul 4	92
2009	Waiting	GDPR Export Estimation Jul 4	92
2009	Apr 2	TBPR & BL Export	92/92
2008	Dec 31	TBPR & BL Export	95/95
2008	Sep 27	TBPR & BL Export	62/62
2008	Jul 26	TBPR & BL Export	87/87
2008	Apr 30	TBPR & BL Export	62/62
2008	Feb 27	TBPR & BL Export	45/45
2008	Jan 12	TBPR & BL Export	78/78
2007	Oct 26	TBPR & BL Export	100/100
2007	Jul 20	TBPR & BL Export	80/80
2007	Apr 30	TBPR & BL Export	98/98
2007	Jan 25	Algo update - Reduce Googlebomb Impact
2007	Jan 25	TBPR & BL Export	18/18
2007	Jan 10	TBPR & BL Export	101/101
2006	Sep 28	TBPR & BL Export	76/76
2006	Jul 13	TBPR & BL Export	100
2006	Apr 04	TBPR Export	45
2006	Apr 07	TB Program Update FF v2.0f
2006	Feb 18	TBPR & BL Export	122/60
2006	Jan 30	TB Program Update IE v4.0.513.2984 Beta
2006	Jan 4	Infra Update - BigDaddy
2005	Dec 19	GDPR & BL Export	106
2005	Nov 04	Algo Update - Jagger 3
2005	Oct 27	Algo Update - Jagger 2
2005	Oct 19	TBPR & BL Export	97/45
2005	Oct 16	Algo Update - Jagger 1
2005	Sep 04	GDPR & BL Export	85
2005	Jul 14	TBPR & BL Update	83/33
2005	Jun 11	GDPR Update	18
2005	Jun 08	BL Update
2005	May 27	TBPR Goes Grey For 3 Days
2005	May 24	GDPR & BL Update	32
2005	Apr 22	TBPR, GDPR & BL Update	111/50
2005	Mar 04	BL Update
2005	Mar 03	GDPR Update	28
2005	Feb 23	TB Program Update IE 3.0.119.6
2005	Feb 04	GDPR Update	24
2005	Feb 03	BL & Algo Update
2005	Jan 10	GDPR Update	88
2005	Jan 1	TBPR & BL Update	87/16
2004	Dec 16	BL Update
2004	Nov 25	BL Update
2004	Oct 28	GDPR Update?	??
2004	Oct 28	BL Update
2004	Oct 18	BL Update Rolled Back
2004	Oct 17	GDPR Update	67
2004	Oct 16	BL Update
2004	Oct 6	TBPR Update; No BL Update	106
2004	Sept 10	BL Update
2004	Sept 8	TB Program Update
2004	Aug 30	BL Update
2004	Aug 10	GDPR Update	158?
2004	Aug 9	BL Update
2004	Jul 16	BL Update
2004	Jun 22	TBPR & BL Update	22
2004	May 31	TBPR & BL Update	38
2004	Apr 23	TBPR & BL Update	16
2004	Apr 7	TBPR & BL Update	22
2004	Mar 16	TBPR, GDPR & BL Update	50
2004	Feb 11	Brandy: Algo Update
2004	Jan 26	TBPR & BL Update	15
2004	Jan 11	Austin: TBPR & BL Update	19
2003	Dec 23	TBPR & BL Update	17
2003	Dec 6	TBPR Update	20
2003	Nov 16	Florida: TBPR, BL & Algo Update	21
2003	Oct 26		35
2003	Oct 2	GDPR Update
2003	Sept 21		23
2003	Aug 29		21
2003	Aug 8		54
2003	Jun 15		40
2003	May 6		25
2003	Apr 11		36
2003	Mar 6		41
2003	Jan 25		24
2003	Jan 1		35
2002	Nov 27		27
2002	Oct 31	TBPR & BL Update	35
2002	Sept 26	TBPR GDPR & BL Update	36
2002	Aug 21	TBPR GDPR & BL Update	27
2002	Jul 25	TBPR & BL Update	32
2002	Jun 23	TBPR & BL Update	30
2002	May 24		29
2002	Apr 25		19
2002	Apr 6		45
2002	Feb 20		26
2002	Jan 25		29
2001	Dec 27		32
2001	Nov 25		28
2001	Oct 28		42
2001	Sept 16		28
2001	Aug 19		31
2001	Jul 19		30
2001	Jun 22		32
2001	May 21		28
2001	Apr 23		28
2001	Mar 26		35
2001	Feb 19		29
2001	Jan 21		33
2000	Dec 19		31
2000	Nov 18		27
2000	Oct 22		54
2000	Aug 29		34
2000	Jul 26		Unknown

TBPR Export: Toolbar PageRank Export - export of Real PR to the Toolbar PR 11 unit scale (no longer called a PR update as Real PR is updated continously and the Toolbar PR change is just an export of that updated value).
GDPR Export: Google Directory Export - export of Real PR to the Google Directory 8 unit scale (no longer called a PR update as Real PR is updated continously and the Google directory PR change is an export of that updated value).
BL Export: Backlink Export - export of a sample of the number of backlinks which is almost meaningless as it is only a sample number. This number can be seen with the link:www.domain.tld command (no longer called a BL update as backlinks are updated continously and the visible BL number change is an export of that updated value).
Algo Update: Algorithm Update - a major update in the Ranking algorithm that causes a large SERP change.
TB Program Version Change: Toolbar Program Version Change - a software version change to the Google toolbar that displays PR.
Days: Days between toolbar PR exports.