Casinomeister said:Well, blimey!!
So, how would someone tamper something like this? Would there be some kind of code in the page's HTML?
The last modified date is simply the file last modified date, which you can view in windows explorer or any other file management tool. The simplest way to change this would be to change the date on your PC. There is also the 'touch' command, which is supplied with Unix and is also available for Windows, which allows you to update the last modified date of the file with whatever you like.