Sam, Rashi says explicitly that when the Torah says Vayehi Erev Vayehi Voker Yom Echad it means 24 hours, “[the day and night together] – i.e. 24 hours between them”. The Gemorah describes 10 things that were created on the first day of creation, one of which is the “length of the day and night” – as it says, “vayehi erev vayehi voke yom echad”. So the time span of the day was created on the first day of creation. On the fourth day Hashem said the sun should shine during the time-period that was called “day” and the stars/darkness should rule during the time-period called “night”.
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