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* Clone a date object.\n *\n * @export\n * @param  {Date} d The date to clone\n * @return {Date} The cloned date\n */\nexport function clone(d) {\n  return new Date(d.getTime());\n}\n\n/**\n * Return `true` if the passed value is a valid JavaScript Date object.\n *\n * @export\n * @param {any} value\n * @returns {Boolean}\n */\nexport function isDate(value) {\n  return value instanceof Date && !isNaN(value.valueOf());\n}\n\n/**\n * Return `d` as a new date with `n` months added.\n *\n * @export\n * @param {Date} d\n * @param {number} n\n */\nexport function addMonths(d, n) {\n  const newDate = clone(d);\n  newDate.setMonth(d.getMonth() + n);\n  return newDate;\n}\n\n/**\n * Return `true` if two dates are the same day, ignoring the time.\n *\n * @export\n * @param  {Date}  d1\n * @param  {Date}  d2\n * @return {Boolean}\n */\nexport function isSameDay(d1, d2) {\n  if (!d1 || !d2) {\n    return false;\n  }\n  return (\n    d1.getDate() === d2.getDate() &&\n    d1.getMonth() === d2.getMonth() &&\n    d1.getFullYear() === d2.getFullYear()\n  );\n}\n\n/**\n * Return `true` if two dates fall in the same month.\n *\n * @export\n * @param  {Date}  d1\n * @param  {Date}  d2\n * @return {Boolean}\n */\nexport function isSameMonth(d1, d2) {\n  if (!d1 || !d2) {\n    return false;\n  }\n  return (\n    d1.getMonth() === d2.getMonth() && d1.getFullYear() === d2.getFullYear()\n  );\n}\n\n/**\n * Returns `true` if the first day is before the second day.\n *\n * @export\n * @param {Date} d1\n * @param {Date} d2\n * @returns {Boolean}\n */\nexport function isDayBefore(d1, d2) {\n  const day1 = clone(d1).setHours(0, 0, 0, 0);\n  const day2 = clone(d2).setHours(0, 0, 0, 0);\n  return day1 < day2;\n}\n\n/**\n * Returns `true` if the first day is after the second day.\n *\n * @export\n * @param {Date} d1\n * @param {Date} d2\n * @returns {Boolean}\n */\nexport function isDayAfter(d1, d2) {\n  const day1 = clone(d1).setHours(0, 0, 0, 0);\n  const day2 = clone(d2).setHours(0, 0, 0, 0);\n  return day1 > day2;\n}\n\n/**\n * Return `true` if a day is in the past, e.g. yesterday or any day\n * before yesterday.\n *\n * @export\n * @param  {Date}  d\n * @return {Boolean}\n */\nexport function isPastDay(d) {\n  const today = new Date();\n  today.setHours(0, 0, 0, 0);\n  return isDayBefore(d, today);\n}\n\n/**\n * Return `true` if a day is in the future, e.g. tomorrow or any day\n * after tomorrow.\n *\n * @export\n * @param  {Date}  d\n * @return {Boolean}\n */\nexport function isFutureDay(d) {\n  const tomorrow = new Date(new Date().getTime() + 24 * 60 * 60 * 1000);\n  tomorrow.setHours(0, 0, 0, 0);\n  return d >= tomorrow;\n}\n\n/**\n * Return `true` if day `d` is between days `d1` and `d2`,\n * without including them.\n *\n * @export\n * @param  {Date}  d\n * @param  {Date}  d1\n * @param  {Date}  d2\n * @return {Boolean}\n */\nexport function isDayBetween(d, d1, d2) {\n  const date = clone(d);\n  date.setHours(0, 0, 0, 0);\n  return (\n    (isDayAfter(date, d1) && isDayBefore(date, d2)) ||\n    (isDayAfter(date, d2) && isDayBefore(date, d1))\n  );\n}\n\n/**\n * Add a day to a range and return a new range. A range is an object with\n * `from` and `to` days.\n *\n * @export\n * @param {Date} day\n * @param {Object} range\n * @return {Object} Returns a new range object\n */\nexport function addDayToRange(day, range = { from: null, to: null }) {\n  let { from, to } = range;\n  if (!from) {\n    from = day;\n  } else if (from && to && isSameDay(from, to) && isSameDay(day, from)) {\n    from = null;\n    to = null;\n  } else if (to && isDayBefore(day, from)) {\n    from = day;\n  } else if (to && isSameDay(day, to)) {\n    from = day;\n    to = day;\n  } else {\n    to = day;\n    if (isDayBefore(to, from)) {\n      to = from;\n      from = day;\n    }\n  }\n\n  return { from, to };\n}\n\n/**\n * Return `true` if a day is included in a range of days.\n *\n * @export\n * @param  {Date}  day\n * @param  {Object}  range\n * @return {Boolean}\n */\nexport function isDayInRange(day, range) {\n  const { from, to } = range;\n  return (\n    (from && isSameDay(day, from)) ||\n    (to && isSameDay(day, to)) ||\n    (from && to && isDayBetween(day, from, to))\n  );\n}\n\n/**\n * Return the year's week number (as per ISO, i.e. with the week starting from monday)\n * for the given day.\n *\n * @export\n * @param {Date} day\n * @returns {Number}\n */\nexport function getWeekNumber(day) {\n  const date = clone(day);\n  date.setHours(0, 0, 0);\n  date.setDate(date.getDate() + 4 - (date.getDay() || 7));\n  return Math.ceil(\n    ((date - new Date(date.getFullYear(), 0, 1)) / 8.64e7 + 1) / 7\n  );\n}\n\nexport default {\n  addDayToRange,\n  addMonths,\n  clone,\n  getWeekNumber,\n  isDate,\n  isDayAfter,\n  isDayBefore,\n  isDayBetween,\n  isDayInRange,\n  isFutureDay,\n  isPastDay,\n  isSameDay,\n  isSameMonth,\n};\n"]}