When troubleshooting R bugs or asking for assistance in mailing lists and sites like StackOverflow, it is good to review or present information about your system and packages loaded.
I much prefer the session_info() function from the devtools package over the default sessionInfo() function as it’s output is not only more readable, it also provides useful information like timezone and additional packages (non-base) loaded at the time.
Assuming you have the devtools packages already installed, you can invoke the function in one line:
devtools::session_info()