From Mike Chapple,
Your Guide to Databases.
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Function: Day()

Purpose: The Day() function returns an integer corresponding to the day of the month (1-31) corresponding to the input date.

Usage: Day(date_expression)

The input date_expression is usually a string value or date invariant, but can be any expression that evaluates to a date in the range January 1, 100 through December 31, 9999.

Returns: Integer corresponding to the day of the month of date_expression.

Examples and Special Cases

Day(“February 1, 2006”) returns 1
Day(“2/12/2006”) returns 12