There are tools that automatically compare the differences between two PDF files, but you can't detect the difference well unless they are almost the same text. When comparing PDF files with a revised ...
How-To Geek on MSN
7 Microsoft Excel tricks you probably didn't know
Press Ctrl+; to insert the current date. Press Ctrl+Shift+; to insert the current time. Press Ctrl+; > Space > Ctrl+Shift+; to insert the current date and time together in the same cell.
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