Number lower than 0 to show 0 using IF

I have a column called "Days worked", which I get using: =NETWORKDAY([Start date]143; TODAY()).

I use this for all tasks, including future. Therefore it shows a negative number when it is a future project that has not started yet.

I want it instead to say 0.

I tried with: =NETWORKDAY([Start date]143; TODAY()), IF([Days worked]143<0,"0"

This does not work. Does anyone know how to do it properly?

Thank you in advance.

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