Java File.lastModified returned value changes if timezone changes?

Question

Is the function lastModified from class File returning allways the same value even if the current device time is updated or even if the user changes the device timezone?

Answer 1

File.lastModified corresponds to the last time the file that File points to was updated, and it's expressed in UTC milliseconds since the Epoch (1-1-1970). So, no, it does not change unless you modify the file.

Answer 2

Generally File.lastmodified is a static value (that can be updated, if you 'modify the file', obviously)

However, it is technically possible for 'root' on a linux system to modify the value https://askubuntu.com/questions/62492/how-can-i-change-the-date-modified-created-of-a-file (yes, I know... not 'Android', but Android runs the linux kernel and can probably do the same thing. if the person has rooted their phone.)

So it is 'technically' possible to change that value, but 'realistically' it won't change unless the file is changed/modified/etc.