Abbreviate strings to at least minlength characters with abbreviate
abbreviate(month.name, minlength = 3)
## January February March April May June July
## "Jnr" "Fbr" "Mrc" "Apr" "May" "Jun" "Jly"
## August September October November December
## "Ags" "Spt" "Oct" "Nvm" "Dcm"