Full Idea
Stoics do not allow a minimal time to exist, and do not want to have a partless 'now'; so what one thinks one has grasped as present is in part future and in part past.
Gist of Idea
The present does not exist, so our immediate experience is actually part past and part future
Source
report of Chrysippus (fragments/reports [c.240 BCE]) by Plutarch - On Common Conceptions 1081c
Book Reference
'The Stoics Reader', ed/tr. Inwood,B/Gerson,L.P. [Hackett 2008], p.87
A Reaction
[from lost On Parts Bk3-5] I agree with the ontology here, but I take our grasp of the present to be very short-term memory of the past. I ignore special relativity. Chrysippus expressed two views about this; in the other one he was a Presentist.
Related Ideas
Idea 20819 The past and the future subsist, but only the present exists [Chrysippus, by Plutarch]
Idea 20821 Time is continous and infinitely divisible, so there cannot be a wholly present time [Chrysippus, by Stobaeus]