When I filled the B1/B2 visa related questions (the D-160 form), I mentioned I do not know when I will go to the US, but I estimated to arrive in April 2020.
The interview went well and I received the visa, and I think it is already active, starting with this year.
Will there be any problem if I will arrive, let's say, in February 2020?
Should I have the return flight tickets when entering the US? My travel schedule is quite flexible and I usually buy the tickets just a few weeks before I travel.