Thanks for all the replies, so really what im gathering is that most people have different considerations on what they consider their Day 1. There are two different answers here that to me both make sense, but do contradict each other, first being the two week period then counting at start of veg. And the other being FriendlyTokez comment above. As he does have a point that the seeds life cycle has begun once it begins to germinate and roots begin to travel into the soil.
So i guess really it all comes down to personal preference. Im just looking for a general rule of thumb as most people keeping a journal here, keep a running total of days from start to finish was just trying to figure out when i should start counting