Here you can query what inspector you are looking for use or what is most relevant - https://developer.bigfix.com/relevance/search/?query=modific
And if we want to get the passed days since file modified, we can go something like -
from Linux -
Q: (now - modification time of file “/etc/passwd”)/day
A: 117
T: 181
From Windows -
Q: (now - modification time of file “C:\Program Files (x86)\BigFix Enterprise\BES Client\msvcr110.dll”)/day
A: 237
T: 0.214 ms