!keep timer Script

[ComputerTech]

So looking for a script, i am unsure if it's difficult or hard to make, but i'll explain it anyway

so a user types !bnc the bot logs that user

then after 14 days, and if the user hasnt typed !keep within 14 days

the bot add's a line to a text file

is this easy to make?

all help and scripting much appreciated