How to convert absolute path to relative path in PowerShell?

Question

I'd like to convert a path to a relative path in a PowerShell script. How do I do this using PowerShell?

For example:

Path to convert: c:documentsmynicefilesafile.txt
Reference path:  c:documents
Result:          mynicefilesafile.txt

And

Path to convert: c:documentsmyproject1afile.txt
Reference path:  c:documentsmyproject2
Result:          ..myproject1afile.txt

question from:https://stackoverflow.com/questions/12396025/how-to-convert-absolute-path-to-relative-path-in-powershell