structural:reformatting
Philosophy of Time

The British idealist J. M. E. McTaggart is best known for his paper " The Unreality of Time " (1908), in which he argues that time is unreal. What he calls the " A theory ", also known as "temporal becoming", and closely related to presentism, which conceptualizes of time as tensed (i.e., having the properties of being past, present, or future), is a view which has been seen as beginning with Heraclitus. By contrast, his " " B theory ", under which time is tenseless (i.e., earlier than, simultaneous to, or later than), has similarly been seen as beginning with Parmenides.