'Day' in the Bible

For it has reached you, and remains with you, just as it has also spread through the whole world, yielding fruit there and increasing, as it has done among you from the day when first you heard it and came really to know the grace of God,

For this reason we also, from the day we first received these tidings, have never ceased to pray for you and to entreat that you may be filled with a clear knowledge of His will accompanied by thorough wisdom and discernment in spiritual things;