import { default } from "https://deno.land/x/date_fns@v2.12.0/isSunday/index.js";
Examples
// Is 21 September 2014 Sunday?
var result = isSunday(new Date(2014, 8, 21))
//=> true
// Is 21 September 2014 Sunday? var result = isSunday(new Date(2014, 8, 21)) //=> true