John 20:19 says that the disciples were gathered together at evening on the first day of the week. Since it is generally accepted that the first day of the week began at sundown at the end of the seventh day, and since all the first day early and late morning activities had apparently taken place in the light part of the day by the time of the gathering, how can it be the evening? Didn’t evening and the new day start at sundown? Or is "evening" being used here to refer to the period of time between noon and sundown? And if so, what would they have called the dark period after sundown if it wasn't evening?