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JavaScript Practice Object Interaction Checking Out and Returning a Book Demo: Charging Fines to Patrons

Question about the video

Hi. what exactly this line contains: i didnt fullt understand what dateDiff contain, when i tried to console.log i got: Thu Jan 15 1970 02:00:00 GMT+0200 (שעון ישראל (חורף))

 const dateDiff = new Date(now - patron.currentBook.dueDate);

This contains the difference in days between the date in now and the currentBook's duedate