Hi, looks wrong to me too.

I guess you are trying to generate an SQL snippet for MySQL. Assuming $newdateadded is a number, not a date,

(TO_DAYS(dateadded)-TO_DAYS(Now())>=-$newdateadded)
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or ...

(
  N # number of days from 0 for a date presumably in the past
  -
  M # number of days from 0 to now
) # will yield a negative number
>=
-O # some number of days, but negative
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...
so your SQL will be something like:

( ( TO_DAYS(dateadded) - TO_DAYS(Now()) ) >= -42 )
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and for values like the first of the month and today, that would be parsed as:

( ( TO_DAYS("2020-03-01") - TO_DAYS("2020-03-17") ) >= -42 )
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... or:

(737850 - 737866) >= -42)
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... which evaluates to true, so whatever runs the query captured in the $no_days variable will know that.

This may be what you want, but I still say it looks wrong, because of the convoluted logic in the comparison, and because of the variable naming.

Hope this helps!