Nothing
Code
print(mat)
Output
date datetime<local> datetime<US/Central> POSIXlt<US/Central> duration<mins> duration<secs>
date "date" "datetime<local>" "datetime<US/Central>" "datetime<US/Central>" NA NA
datetime<local> "datetime<local>" "datetime<local>" "datetime<US/Central>" "datetime<US/Central>" NA NA
datetime<US/Central> "datetime<US/Central>" "datetime<US/Central>" "datetime<US/Central>" "datetime<US/Central>" NA NA
POSIXlt<US/Central> "datetime<US/Central>" "datetime<US/Central>" "datetime<US/Central>" "datetime<US/Central>" NA NA
duration<mins> NA NA NA NA "duration<mins>" "duration<secs>"
duration<secs> NA NA NA NA "duration<secs>" "duration<secs>"
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