There are several different festival calendars in the Bible, each penned by a different author: Exodus 23:24-19 (E), Exodus 34:18-23 (J), Deuteronomy 16:1-17 (D), and Leviticus 23 and Numbers 28-29 (P).
We will look at these differences in greater detail later on. Here, I simply note that the spring festival of reaping the first barely crop is variously labeled as the festival of Harvest in the Elohist tradition and the festival of Weeks in the Yahwist. It is possible the Yahwist’s tradition was shaped by the Deuteronomist, since it evidences the Deuteronomist’s week long festival.
Basically, I need more time to look through these different festive calenders in order to discuss their differences. I’ll do that when we get to Leviticus 23.