The title might be a little ambiguous since I do not mean to talk about time curvature. I am interested in some non-technical explanation, in some historical context, of past and current knowledge/research (if there ever was) regarding the possibility that the time line might be entirely composed of discrete values, that is, that time might not be continuous, implying there is a smallest universal unit of time or atoms of time. I know that there is really no reason to think like this, but I am just wondering if this thought has ever occurred in physics literature.Thanks! I wasn't really sure to what forum type this subject might belong to. I chose this because I thought that 'discretness of time' might pertain to quanta.