Show date field that's 90 days from $date_entered

Our proposal contracts expire in 90 days, so I want a field that shows the expiration date. It seems simple but the formula... 

addDays($date_entered,90)

...isn't working. The field comes back as blank. Using $date_entered as the date, how do I add 90 days, then have that date displayed? What kind of field should be using(e.g. date or datetime)?

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  • This info is very helpful to know going forward, however it doesn't totally solve my issue because it only works on newly created opportunities. I've got a significant number of opportunities in the system already and I'd like to know their expiration dates as well. Additionally, 90 days≠3 months because each month has a different number of days in it. 

  • When I try your exact formula on a 'date' type field, it works just fine for me. What version/edition are you using?