Not knowng where you got the assumption that "day" was only allowed to be interpreted as a 24 hour day, I would like to elucidate a little on the word.
I'll begin with a simple definition and as far as I know it has nothing to do with creationism.
day
/deɪ/Pronunciation Key - Show Spelled Pronunciation[dey]Pronunciation Key - Show IPA Pronunciation
noun 1.the interval of light between two successive nights; the time between sunrise and sunset:
Since there was no artificial illumination, all activities had to be carried on during the day. 2.the light of day; daylight:
The owl sleeps by day and feeds by night. 3.
Astronomy. a.Also called
mean solar day. a division of time equal to 24 hours and representing the average length of the period during which the earth makes one rotation on its axis. b.Also called
solar day. a division of time equal to the time elapsed between two consecutive returns of the same terrestrial meridian to the sun. c.Also called
civil day. a division of time equal to 24 hours but reckoned from one midnight to the next. Compare
lunar day,
sidereal day. 4.an analogous division of time for a planet other than the earth:
the Martian day. 5.the portion of a day allotted to work:
an eight-hour day. 6.a day on which something occurs:
the day we met. 7.(
often initial capital letter
) a day assigned to a particular purpose or observance:
New Year's Day. 8.a time considered as propitious or opportune:
His day will come. 9.a day of contest or the contest itself:
to win the day. 10.Often,
days. a particular time or period:
the present day; in days of old. 11.Usually,
days. period of life or activity:
His days are numbered. 12.period of existence, power, or influence:
in the day of the dinosaurs. 13.
light1 (def. 19a).
Idioms 14.
call it a day, to stop one's activity for the day or for the present; quit temporarily:
After rewriting the paper, she decided to call it a day. 15.
day in, day out, every day without fail; regularly:
They endured the noise and dirt of the city day in, day out. Also,
day in and day out.
Now as to the scriptures we continue to find that "day" does not always mean a 24 hour space of time.
Let's go to Genesis
Gen 1:5 And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.
Here we see that the light was Day and the darkness was Night. The Hebrew words for evening and morning are better translated:
Evening = Dusk or sunset
Morning = Dawn or sunrise
The Hebrew words from the Strongs Dictionary of Hebrew and Greek Words are:
Evening =
H6153
ערב
‛ereb
eh'-reb
From H6150; dusk
Morning =
H1242
בּקר
bôqer
bo'-ker
From H1239; properly dawn (as the break of day); generally morning
Day =
H3117
יום
yôm
yome
From an unused root meaning to be hot; a day (as the warm hours), whether literally (from sunrise to sunset, or from one sunset to the next), or figuratively (a space of time defined by an associated term), (often used adverbially)
For the sake of brievity I add one more bit of information given to us by Peter in his epistle (letter).
2Pe 3:8 But, beloved, be not ignorant of this one thing, that one day [is] with the Lord as a thousand years, and a thousand years as one day.
So you see the Lord does not always define "day" as merely a 24 hour period.