Full Idea
If there are temporally extended entities - and there are - then there must be extended regions of time for those entities to extend in. Hence presentism is false.
Gist of Idea
Surely if things extend over time, then time itself must be extended?
Source
Ross P. Cameron (Truthmaking for Presentists [2011], 4)
Book Reference
'Oxford Studies in Metaphysics Vol.6', ed/tr. Zimmerman,D/Bennett,K [OUP 2011], p.72
A Reaction
[Cameron is playing devil's advocate] Something has to be weird here, and I take it to be the fact that the past no longer exists, and yet it is fixed and supports truths. Get over it. My childhood has gone. Totally. Irrevocably.