New Grower When is Day one?

Is there unspoken rule on when exactly we call a plant 1 day old? I just started a new FastBuds grow and was wondering when you guys call it day 1. I've called day 1 the first day they get their first set of true leaves. Is it when they crack open? Break the surface of your medium?

Grow on...
I was pretty confused about this myself! Thanks for asking!! It's nice to see everybody's answers. I eventually decided that day 1 for me was when I could see green. Mine popped her head up fully encased. I call it day 0. :smoking:
 
Good question I think everybody does it different I germinate right in the soil no transplant no soaking seeds nothing as soon as I put the seed in the soil to me that's day 1
 
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