List of changed lines

Hello,

Is it possible, either natively or through Vim script (I'm happy to write the code, but not sure what to look for), to get a list of the lines that have been changed since a particular moment?

For example, I want a list of the lines I've added, deleted or modified since the last time I saved the file or since the last time I opened the file, even if it's been saved in between, or in the past hour. 

Thank you very much,

Salman

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