date diff

date.diff.js

function getTimeDiffFromNow(timestamp) {
  const diff = timestamp - Date.now();
  const absDiff = Math.abs(diff);
  const dateObj = {
    year: Math.floor(absDiff / 31_104_000_000),
    month: Math.floor((absDiff / 2_592_000_000) % 12),
    day: Math.floor((absDiff / 86_400_000) % 30),
    hour: Math.floor((absDiff / 3_600_000) % 24),
    minute: Math.floor((absDiff / 60_000) % 60),
    second: Math.floor((absDiff / 1_000) % 60),
    //millisecond: Math.floor( absDiff % 1000),
  };
  const finalString = Object.entries(dateObj)
    .reduce((acc, [key, val]) => {
      if (acc.length < 2 && val !== 0)
        acc.push(val + ' ' + (key + (val === 1 ? '' : 's')));
      return acc;
    }, [])
    .join(' and ');
  console.log(dateObj);
  return diff > 0 ? `In ${finalString}` : `${finalString} ago`;
}

console.log(getTimeDiffFromNow(new Date('2023-06-28').valueOf()));
//In 1 year and 5 days

console.log(getTimeDiffFromNow(new Date('2021-06-28').valueOf()));
//1 year and 4 days ago

console.log(getTimeDiffFromNow(new Date('2020-07-30').valueOf()));
//1 year and 11 months ago

//days will differ because this code thinks that all months have 30 days