Does "Evening then Morning" mean one day? (Seventh Day Adventists)

Genesis 1 contains the language of "evening came, then the morning" for each of the Six Days of Creation. This Biblical language of putting the "evening" first then "morning" second has lead the Jewish custom to count all of our days as starting/ending at sunset. So when they get ready for the Sabbath on Saturday, this means the Sabbath/Saturday actually begins at sunset on Friday afternoon. Though I had not thought about it, I had always assumed this to be what Genesis 1 meant because so many people had said this is what "evening then morning" meant. While that is a possible meaning, I came across someone claiming that "evening then morning" just refers to the night time, and that Genesis 1 was actually saying a day beings in the morning. This will be a short post discussing this possibility. 

The best place to begin is by looking at how Genesis 1 uses the "evening then morning" language, which I will briefly show here: