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[edited by: tedster at 9:14 pm (utc) on Apr 18, 2010]
How could inbound external links change the last modified date of head?
if they use the data, they come up with the date that does not equal to any of the above mentioned dates.
As my account name here suggests, I know exactly what you are talking about :)
There are times when finding a slight error in a script is difficult, even if you're the one writing it
We just have to keep guessing what that something is.
I may be wrong but it looks to me that the very fact that G* uses the time tag implies to the user that the fresher the better yet in most areas outside news delivery it's a wrong assumption.