Eurostar journey with Eurail France Pass, does it use up 1 day of travel on the pass?

Hi, need community help for one question please. if Eurail France pass can be used for Eurostar trips and we only pay the reservation fees, then for trip made on each day, we would be using up one day of travel on the Eurail France pass, right?Saw an old answer from 5 years ago that pass days would not get utilized and got confused. We are a family of four planning to travel from paris to london and back via eurostar in end Dec 2017.Kindly help clarify soon so we get the france pass with the right number of days we will use in one month.
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