react-native-surveys/Forms/components/DatePicker/time.js

Build your own forms, surveys and polls for your React Native apps.

function throwIfInvalidDate(date) {
  if (Object.prototype.toString.call(date, null) !== "[object Date]") {
    throw new Error("参数类型不对");
  }
}

function daysInMonth(year, month) {
  return new Date(year, month + 1, 0).getDate();
}

export function convertDate(date, format = "YYYY/MM/DD") {
  let str = format;
  const o = {
    "M+": date.getMonth() + 1,
    "D+": date.getDate(),
    "h+": date.getHours(),
    "m+": date.getMinutes(),
    "s+": date.getSeconds()
  };

  if (/(Y+)/.test(format)) {
    str = str.replace(
      RegExp.$1,
      date
        .getFullYear()
        .toString()
        .substr(4 - RegExp.$1.length)
    );
  }

  for (const k in o) {
    // eslint-disable-line
    if (new RegExp(`(${k})`).test(format)) {
      str = str.replace(
        RegExp.$1,
        RegExp.$1.length === 1
          ? o[k]
          : `00${o[k]}`.substr(o[k].toString().length)
      );
    }
  }

  return str;
}
export const getDayFormat = (date = new Date(), hasHours, timezone) => {
  const day = dayOfWeekAsString(date.getDay());
  const number = getNumberWithOrdinal(date.getDate());
  const month = monthAsString(date.getMonth());
  const year = date.getFullYear();
  let hours = "";
  let zone = "";

  if (hasHours) {
    hours = getHoursAndMinutes(date) + " ";
    zone = timezone;
  }

  return hours + day + ", " + month + " " + number + " " + year + " " + zone;
};

function addZero(i) {
  if (i < 10) {
    i = "0" + i;
  }

  return i;
}

export function getHoursAndMinutes(d) {
  if (!d) d = new Date();
  const h = addZero(d.getHours());
  const m = addZero(d.getMinutes());
  return h + ":" + m;
}

function dayOfWeekAsString(dayIndex) {
  return [
    "Sunday",
    "Monday",
    "Tuesday",
    "Wednesday",
    "Thursday",
    "Friday",
    "Saturday"
  ][dayIndex];
}

function monthAsString(monthIndex) {
  return [
    "January",
    "February",
    "March",
    "April",
    "May",
    "June",
    "July",
    "August",
    "September",
    "October",
    "November",
    "December"
  ][monthIndex];
}

function getNumberWithOrdinal(n) {
  const s = ["th", "st", "nd", "rd"],
    v = n % 100;
  return n + (s[(v - 20) % 10] || s[v] || s[0]);
}

export function returnTimeZone(date = "") {
  if (date) {
    if (date.split(",")[1]) return date.split(",")[1].substring(7);
  }

  return /\((.*)\)/.exec(new Date().toString())[1];
}
export function nextYear(now, index = 0) {
  throwIfInvalidDate(now);
  return new Date(
    now.getFullYear() + index,
    now.getMonth(),
    now.getDate(),
    now.getHours(),
    now.getMinutes(),
    now.getSeconds()
  );
}
export function nextMonth(now, index = 0) {
  throwIfInvalidDate(now);
  const year = now.getFullYear();
  const month = now.getMonth() + index;
  const dayOfMonth = Math.min(now.getDate(), daysInMonth(year, month));
  return new Date(
    year,
    month,
    dayOfMonth,
    now.getHours(),
    now.getMinutes(),
    now.getSeconds()
  );
}
export function nextDate(now, index = 0) {
  throwIfInvalidDate(now);
  return new Date(now.getTime() + index * 24 * 60 * 60 * 1000);
}
export function nextHour(now, index = 0) {
  throwIfInvalidDate(now);
  return new Date(now.getTime() + index * 60 * 60 * 1000);
}
export function nextMinute(now, index = 0) {
  throwIfInvalidDate(now);
  return new Date(now.getTime() + index * 60 * 1000);
}
export function nextSecond(now, index = 0) {
  throwIfInvalidDate(now);
  return new Date(now.getTime() + index * 1000);
}