: ON, AT, FROM — used to indicate a time or date at which something begins or ends
takes effect as of July 1
As of now, it’s difficult to tell in a cancer’s early stage which patients have which kind of tumor.
—Melinda Beck
As of last year 2010, women held 51.4 percent of all managerial and professional positions, up from 26 percent in 1980 …
—Kate Bolick