The article seems to suggest that it does when it refers to falling back to the "environment" of the machine. Presumably that means the locale settings. EDIT:

The article seems to suggest that it does when it refers to falling back to the "environment" of the machine. Presumably that means the locale settings. EDIT: Well, that's what the FreBSD man page says, but it isn't clear if they all behave this way. Seems like the Sllaris one implies it just uses that specific date.