From the classroom notes of the late Walter A. Maier,
Ph.D., Concordia Seminary, 
I. What Some Think
Erroneous opinions have been
held as to the nature and length of the creation days. We note in particular
these two general tendencies: 
A. The reduction of this
period to a moment. This was the tendency of Augustine (Civitate
Dei-12,6) who contended that it was impossible to
comprehend just what God’s day was. Other church fathers held directly that
God’s omnipotence did not require a day and that the Hebrew word
"Yom" was here used as equivalent to a moment. Against this tendency
and against a similar effort to explain these days in an allegorical manner,
Luther says: "Hilary and Augustine, two greatest lights of the church, are
of the opinion that the world was created suddenly and all at once, not during
six consecutive days. And Augustine engages in a strange play with these six
days. He considers them to be mystical days of knowledge in the angels and does
not let them remain six natural days. . . (But) since Moses wants to tell us,
not of allegorical creatures or an allegorical world but of actual creatures
and a visible world, which one may see, feel and touch, he calls a spade a
spade, as the proverb puts it, (using) day and night, as we are wont to do,
without any allegories whatsoever." 
B. The Prolongation of this period to an age of epochs of many years. This is the interpretation which is held by many Christian interpreters today, who believe that this lengthening of the term "Yom" is necessary in order to bring about a harmony of Scriptures with the alleged requirements of science. Geology, it is urged, has demonstrated that vast epochs of many millions of years were required to bring the world into its present condition. In order to make the Biblical record compatible with this, refuge is taken to the interpretation of the creation day as a creation period. In substantiation of this interpretation the following reasons have been advanced:
    1. The
Scriptures themselves use the term "Yom" in a wider sense, in which
the term is clearly not applied to a solar day. So, for example, in Genesis
2:4, the statement "In the day that the Lord God made the earth and the
heavens," refers to the entire period of the creation. So, also, in many
prophetic passages which speak of "the day of the Lord" where this
day sometimes refers to the period when God’s justice is to be executed. To
this we answer: We admit that the term "Yom" is used in a larger and
figurative sense in the Old Testament, but it is a hermeneutical principle that
we adhere to the original and literal meaning of a word, unless there are
evident and manifest reasons for adopting a figurative or derived
interpretation. Such reasons are absent in the case of Genesis 1.
   
2. It is urged that such passages as Ps. 90, 4 ("For a thousand years in
Thy sight are but as yesterday, when it is passed."); 2 Pet. 3, 8
("One day is with the Lord as a thousand years") show that the term
"Yom" is directly used for a period of a thousand years or more. Such
contentions, however, are simply based on a misunderstanding of The important purpose of these passages. They simply show
the timelessness of God and emphasize that fact that God is not limited by the
restrictions of time that are imposed upon men. In addition, it is obviously
unfair to quote from 2 Pet. 3,8 only the words:
"One day is with the Lord as a thousand years" because this passage
adds explicitly, "And a thousand years as one day." 
   
3. It is claimed: "Such enormous haste as the hypothesis of days of 24
hours would necessitate, is not in harmony with God’s methods" (Bible
Difficulties, Rovt. Steward MacArthur,
p. 32). This, as other similar objections (for example, the contention that the
earth would only be 144 hours older than man after Adam had been created) is
simply a restriction of God’s omnipotence and raises difficulties which are
entirely unnecessary. <>
   
4. It is claimed "as the sun is said not to have appeared to rule the day
until the fourth day of Creation, the three preceding days could not have been
solar days but indefinite period." - But there is no logic in this claim. 
   
5. Likewise it is stated: "The seventh day upon which God is said to have
"rested" was conceived as extending thru all succeeding time. As this
day is an immense period, and as the first three days are not solar days but of
indefinite duration, we may reasonably conclude that the other three days were
also intended to describe indefinite period." But this is a tangential,
circle argument.
    6. "The
cosmologies of other peoples are confirmatory of the creation days being
periods and not natural days." But the cosmologies are wrong in this
respect as in a hundred others.
II. What Scripture Says
Contrary to these theories
which either shorten or lengthen the creative day, we must interpret the term
"yom" as a cosmic day of 24 hours, more or
less. This interpretation is made inevitable by the following considerations: 
1. This is the natural interpretation and, as stated above, we always adhere to
the literal interpretation of a term, unless the text itself shows that the
term is to be interpreted figuratively. If it were not for the alleged requirements
of "science," no one would dream of interpreting "yom" otherwise than an ordinary day.
2. This is the interpretation which the text requires. When
after every group of creative acts, the creative day is mentioned, it is
specifically stated that this day was made up of morning and evening. No
twisting of terms is able to obviate the force of this simple statement. Ages,
eras, epochs, do not consist of morning and evening.
3. This is the interpretation which other portions of Scripture demand. In
Exodus 20,11, for example, the Sabbath is instituted
and it is stated that because God rested on the seventh day, He therefore
blessed and hallowed the Sabbath day. If God rested for a seventh era or epoch,
He would have instituted not a Sabbath day but a Sabbath era or epoch. In other
words, if we interpret the Sabbath as a day, we must interpret the seventh day
in the same manner.
4. The theory which explains "yom" as an
epoch fails to bring about the supposed harmony between the Bible and science
for which this theory is advanced. Geology does not teach the completion of the
world in six geologic epochs. In addition, this theory causes additional
difficulties, in the text. The vegetable world was created on the third day,
while the solar system was called into being on the fourth day. Is it possible
to hold that the vegetable world existed throughout a long geologic age without
the sun?
5. In the creative commands of God we have evidence of immediate instant action
which obviates the necessity of long creative labor. In the very first verse we
are told: "God said, Let there be light, and there was light;" how
can we interpose the idea of the creation of light being protracted through,
say, a million years?
6. In the Old Testament, when the term "yom"
is associated with a definite number, it is otherwise used to designate a solar
day. We have no scriptural parallel for Age I, the Second Epoch, the Third,
etc.
7. The theory that "yom" is an epoch
involves difficulties. For example, it is stated that man was created in the
sixth geological era; if the seventh day is another era, then Adam lived
through several eras, an assumption which is absurd in itself.
[Dr.
Walter A. Maier was a professor of Old Testament with a doctorate in Semitic
languages.]