Displaying today's omer count

hebcal-omer.html

<div id="hebcal-omer"></div>
<script defer>
function pad2(number) {
  if (number < 10) {
    return '0' + number;
  }
  return '' + number;
}
let dt = new Date();
if (dt.getHours() > 19) {
  dt.setDate(dt.getDate() + 1);
}
const isoDate = [dt.getFullYear(), pad2(dt.getMonth() + 1), pad2(dt.getDate())].join('-');
const url = `https://www.hebcal.com/hebcal?v=1&cfg=json&o=on&lg=s&start=${isoDate}&end=${isoDate}`;
fetch(url, {method: 'GET', credentials: 'omit'})
  .then(response => response.json())
  .then(data => {
    if (data.items && data.items.length) {
      for (const item of data.items) {
        if (item.category === 'omer') {
          console.log(item);
          // You might also choose to display item.omer.count.en or item.omer.sefira.he
          document.getElementById('hebcal-omer').innerText = item.title;
        }
      }      
    }
  });
</script>

If you want different language (for example Hebrew), change &lg=s to &lg=h

let me start by thanking yall so much for making the amazing api available!!! Chazak u'Baruch

the example code is problematic because it uses ISO dates which changes sooner than our local because of timezones.

I instead wrote this code to yield a true to local time count with a daily text of
Sunday night is 18 days, which is 2 weeks and 4 days of the Omer

   function getYyyyMmDd(dt) {
      return dt.toLocaleString('en-us', {year: 'numeric', month: '2-digit', day: '2-digit'}).replace(/(\d+)\/(\d+)\/(\d+)/, '$3-$1-$2');
    }

    async function updateZmannimTickerText() {
      let todayDate = new Date();
      const today = todayDate.toLocaleDateString('en-us', { weekday: "long" });

      let tomorrowDate = new Date();
      tomorrowDate.setDate(todayDate.getDate() + 1);


      const todayIsoDate = getYyyyMmDd(todayDate);
      const tomorrowIsoDate = getYyyyMmDd(tomorrowDate);
      const url = `https://www.hebcal.com/hebcal?v=1&cfg=json&o=on&lg=s&start=${tomorrowIsoDate}&end=${tomorrowIsoDate}`;
      const resp = await fetch(url, { method: 'GET', credentials: 'omit' });
      const respJson = await resp.json();
      console.log(respJson);
      let omerTxt = '';
      if (respJson.items && respJson.items.length) {
        for (const item of respJson.items) {
          if (item.category === 'omer') {
            omerTxt = `${item.omer.count.en}`.replace(`Today`, `${today} night`);
          }
        }
      }


      zmannimTickerText = `${omerTxt}`;
      document.querySelector(`.zmannim-box`).innerText = zmannimTickerText;
    }

Thanks for the feedback. We've updated the gist to use the local date/time object instead of the toISOString() function