Halo Fabulous~The start date (Birth Date) of anyone or thing is indeed very important to the inception and flow of It's Existence on this Plane.
Using Free WIll and given a choice, a Creator would certainly take into account the Moment It's Creation would begin It's Life.
In your case, a product. One would have to factor in some necessary components to understand the nature of it's course.
There are many variables to consider....the Day for example. A Mo(o)nDay is a great Day to start something nourishing..... let's say a Bath or skin product, for instance. Then, if the Day were a #2 and the Moon was in Cancer then a "WOW" factor for that product certainly would certainly be in your corner.
Auspicious Days are calculated by the intensity of the aspects surrounding that Day. Monday/2/Cancer/Great Aspects to the Moon and then of course, the overall Vibration of all the Numbers M/D/Y= 11/20/29/2.
Deeper into the cocentricity of Numbers, the hour can be considered too.
The more reinforcement of the Single intention paralleled to your purpose and product, the stronger the intention OF THAT PRODUCT'S VIBRATION.
Yes, going by a Day Number helps...but why not intensify the Product's Vibration by layering it with multple aspects.
4+8's are some Powerful Numbers that can help certain products intensify...with heavy hitters like Uranus and Saturn in your corner... Things like Timepieces and an altruistic nature would have some serious longevity!
All Numbers are helpful as long as they are used correctly. It is Humans that work out their Karma in their Lives not the other Way around.
Hope this helps.
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Gnosis ThySelf
Knowledge bows to Spirit