Date Formatting Changes Between Laptop and Desktop - Why?

I've recently noticed that the date formatting on one particular Excel file I use, changes when I transfer it from my laptop to my desktop.It's a long story but I usually work in a part of the building not connected to the server so I have to use a memory stick to transfer from my laptop to my desktop so I can email the file.The date formatting was changing from Eng-Can to Eng-US.This was causing errors after the info from my file was transferred to a master document.Any info on this would be appreciated.

I mean Date And Time

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