import { startOfHour } from "https://deno.land/x/date_fns@v2.5.1/index.js";
Examples
// The start of an hour for 2 September 2014 11:55:00:
var result = startOfHour(new Date(2014, 8, 2, 11, 55))
//=> Tue Sep 02 2014 11:00:00
// The start of an hour for 2 September 2014 11:55:00: var result = startOfHour(new Date(2014, 8, 2, 11, 55)) //=> Tue Sep 02 2014 11:00:00