@Smoking_Joe_Frasier, Once I see a small root comming from the germination, I count that as day 1 of germation.
I put them into the pots and after 1-3 days I start seeing a small plant but that still counts as germation to me.
After a 7 days from germation, I will start counting of vegitation.
So at the end of week 2 of vegitation, they are 3 weeks old from seed to end of week2 vegitation.
For me this is the best way to count and slowly start adding nutrients at week 1 of veg.
In the past i used to count the germination week as vegitation and often it didn't work with calculation veg/flower stages.
likes 4