d3 = require("d3-time@2")
function interval(then, now) {
  if (then <= now) throw new Error("Time’s up!");
  let t = now;
  let years = d3.timeYear.count(now, then);
  if ((t = d3.timeYear.offset(t, years)) > then) t = d3.timeYear.offset(t, -1), --years;
  let months = d3.timeMonth.count(t, then);
  if ((t = d3.timeMonth.offset(t, months)) > then) t = d3.timeMonth.offset(t, -1), --months;
  let days = d3.timeDay.count(t, then);
  if ((t = d3.timeDay.offset(t, days)) > then) t = d3.timeDay.offset(t, -1), --days;
  let hours = d3.timeHour.count(t, then);
  if ((t = d3.timeHour.offset(t, hours)) > then) t = d3.timeHour.offset(t, -1), --hours;
  let minutes = d3.timeMinute.count(t, then);
  if ((t = d3.timeMinute.offset(t, minutes)) > then) t = d3.timeMinute.offset(t, -1), --minutes;
  let seconds = d3.timeSecond.count(t, then);
  if ((t = d3.timeSecond.offset(t, seconds)) > then) t = d3.timeSecond.offset(t, -1), --seconds;
  return {years: years, months: months, days: days, hours: hours, minutes: minutes, seconds: seconds};
//  return `Seconds left ${seconds}`
}

function formatInterval(interval) {
  let format = [];
  for (const key in interval) {
    if (interval[key] === 1) {
      format.push(`${interval[key]} ${key.slice(0, -1)}`);
    } else if (format.length || interval[key] > 1) {
      format.push(`${interval[key]} ${key}`);
    }
  }
  if (format.length > 1) {
    format[format.length - 1] = `and ${format[format.length - 1]}`;
  }

  return format.join(",\n");
}

templateFunction = (interval) => {
  return html`<div class="countdown">
  <span class="time">${interval.years} YEARS</span>
  <span class="time">${interval.months} MONTHS</span>
  <span class="occupation">${interval.days} DAYS</span>
  <br>
  <span class="occupation">${interval.hours} HOURS</span>
  <span class="occupation">${interval.minutes} MINUTES</span>
  <span class="occupation">${interval.seconds} SECONDS</span>
</div>`
}

then = new Date(Date.UTC(doom.year,doom.month,doom.day,doom.hour,doom.minute,doom.second))

now = {
  while (true) {
    const date = new Date(Math.ceil((Date.now() + 1) / 1000) * 1000);
    yield Promises.when(date, date);
  }
}

// formatInterval(interval(then, now))
templateFunction(interval(then,now))

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(last update: 2025-07-11 12:11:39.191713)

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