'Day' in the Bible

Which is come unto you, as it is in all the world; and bringeth forth fruit, as it doth also in you, since the day ye heard of it, and knew the grace of God in truth:

For this cause we also, since the day we heard it, do not cease to pray for you, and to desire that ye might be filled with the knowledge of his will in all wisdom and spiritual understanding;

Therefore, don’t let anyone judge you in regard to food and drink or in the matter of a festival or a new moon or a Sabbath day.