In Being and Time, Heidegger writes:
This task as a whole requires that the concept of time thus gained be distinguished from the common understanding of it. The latter has become explicit in an interpretation of time which reflects the traditional concept that has persisted since Aristotle and beyond Bergson. We must thereby make clear that and in what way this concept of time and common understanding of time originate from temporality. In this way the common concept of time receives again its rightful autonomy - contrary to Bergson's thesis that time understood in the common way is really space.
Is Bergson's thesis (time is spatial) derived from the revision of the basic concepts of space and time rooted in Einsteins GR? If not, is it rooted in Spinoza - time as extension, or via Aristotle (I recall that there is something of a spatial element to Aristotle's conception of time - but it may be no-more that it requires an infinite motion, and that motion is circular and in place - ie a clock).
But is this even the right interpretation of what Heidegger stating about Bergson's thesis, since he is asking about time understood in the 'common way'? As both Einsteins conception, as well as Aristotle's is uncommon.