Full Idea
The present is the boundary between past and future, therefore if there was a first moment of time, it could not have been present - because there can be no past at the beginning of time.
Gist of Idea
The present is the past/future boundary, so the first moment of time was not present
Source
Robin Le Poidevin (Travels in Four Dimensions [2003], 05 'Limits')
Book Reference
Le Poidevin,Robin: 'Travels in Four Dimensions' [OUP 2003], p.77
A Reaction
How about at the start of a race the athletes cannot be running. How about 'all moments of time have preceding moments - apart from the first moment'?