(cache)data/src/routes/date.tsx at main · wikinder/data · GitHub

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export function handleDate(input: string = getToday()) {
  if (!isValid(input)) {
    return null;
  }

  const isoDatetime = `${input}T00:00:00Z`;
  const date = new Date(isoDatetime);

  // "Thursday, January 1, 1970"
  const dateWithWeekday = date.toLocaleDateString('en-US', {
    weekday: 'long',
    month: 'long',
    day: 'numeric',
    year: 'numeric',
  });

  return {
    title: dateWithWeekday,
    heading: <time datetime={isoDatetime}>{dateWithWeekday}</time>,
    data: {
      'ISO 8601': input,
      'Unix time': Math.floor(date.getTime() / 1000),
    },
  };
}

function isValid(input: string) {
  const match = input.match(/^([0-9]{4})-([0-9]{2})-([0-9]{2})$/);

  if (!match) {
    return false;
  }

  const [year, month, day] = match.slice(1).map((str) => parseInt(str, 10));

  if (
    !((1583 <= year && year <= 9999)
      && (1 <= month && month <= 12)
      && (1 <= day && day <= 31))
  ) {
    return false;
  }

  const date = new Date(`${input}T00:00:00Z`);

  return (
    date.getUTCFullYear() === year
    && date.getUTCMonth() === month - 1
    && date.getUTCDate() === day
  );
}

/**
 * Returns the current date in UTC as an ISO string (YYYY-MM-DD)
 */
function getToday(): string {
  const now = new Date();

  return [
    now.getUTCFullYear(),
    String(now.getUTCMonth() + 1).padStart(2, '0'),
    String(now.getUTCDate()).padStart(2, '0'),
  ].join('-');
}