Determining when a specific change was made to a web page

Are there any methods, other than the wayback machine, to determine when a specific change was made to a public web page?

I know how to query the date last modified with the JavaScript code, however, I need to see when a specific change to a web page took place.
HCPCJJ1Asked:
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Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
Then your only information is something like the wayback machine.  There is nothing else that even tries to do that that I know of.
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Dave BaldwinFixer of ProblemsCommented:
On most file systems, the only dates that are kept are the creation date and the last modified date.  Since the last modified date gets updated just by saving the file, it won't necessarily tell you.  Unless you're keeping a log, I can't see how you would do that.
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HCPCJJ1Author Commented:
Since I am trying to determine this information on a public web page, I don't have access to the file system anyway.
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