Hi!
Try out:
$w.onReady(function yesterdayDateNum () {
let today = new Date();
let todayTime = today.getTime();
let yesterdayTime = todayTime - 86400000;
let yesterday = new Date(yesterdayTime);
let tomorrow = new Date(todayTime + 86400000);
console.log(yesterday);
$w('#dataset20').setFilter(wixData.filter()
.between('date', yesterday, tomorrow)
).then(() => {
$w("#dataset20").setFilter(wixData.filter())
});
});