Compute duration in days

[kevin_merakjing]

From the example in Date and Time Expressions : Examples that compute duration in days, months and years

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Date and Time Expressions

Incorporate dates and times into the behavior of your app.

FLOOR(((HOUR([EndDate] - [StartDate])) - (([Years] * 365.24 * 24.0) + ([Months] * 30.4 * 24.0))) / 24.0)

Question :
What is the difference from :
FLOOR(HOUR([EndDate] - [StartDate])/24)
since i got the same result.