Working with dates and time in WIX Code?

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Hi guys.
Honestly, unless you know javascript well… we are going to struggle. I am learning javascript here… JavaScript Tutorial

I have a quoteDate field in the collection.
I want to add a NUMBER of days to that date to show ad deadlineDate.
25 March 2018 + XX days = ?

How do I add numbers to a date value in the data.js file?