The Amondawa tribe in Amazon discovered in 1986 have no concept of  abstract time according to a study from the University of Portsmouth and the Federal University of Rondonia in Brazil.

We’re really not saying these are a ‘people without time’ or ‘outside time…Amondawa people, like any other people, can talk about events and sequences of event,….What we don’t find is a notion of time as being independent of the events which are occurring; they don’t have a notion of time which is something the events occur in.

Evidence for this includes that the people do not refer to their ages, but that they take different names at different stages of their lives or as they achieve different status within the community.

Other theorists are not so sure however. When a tribe with a limited vocabulary refers to things in the external world time might not be mapped onto it. In other words the Amondawa might well experience and understand time as we do, its just that it isn’t or can’t be articulated within the language…..(via)