guild_front/src/components/Calendar/calendarHelper.js

import moment from "moment";
import "moment/locale/ru";

export function calendarHelper(value) {
  const startDay = value
    .clone()
    .startOf("month")
    .startOf("week")
    .startOf("day");
  const endDay = value.clone().endOf("month").endOf("week");

  const day = startDay.clone().subtract(1, "day");

  const calendar = [];

  while (day.isBefore(endDay, "day")) {
    calendar.push(
      Array(1)
        .fill(0)
        .map(() => day.add(1, "day").clone())
    );
  }

  return calendar;
}

export function getReports(value) {
  const startDay = value
    .clone()
    .startOf("month")
    .startOf("week")
    .startOf("day");
  const reportsStart = `${new Date(startDay).getFullYear()}-${
    new Date(startDay).getMonth() + 1
  }-${new Date(startDay).getDate()}`;
  const endDay = value.clone().endOf("month").endOf("week");
  const reportsEnd = `${new Date(endDay).getFullYear()}-${
    new Date(endDay).getMonth() + 1
  }-${new Date(endDay).getDate()}`;
  const getReports = `fromDate=${reportsStart}&toDate=${reportsEnd}`;

  return getReports;
}

export function getCreatedDate(day) {
  if (day) {
    return `${new Date(day).getFullYear()}-${correctDay(
      new Date(day).getMonth() + 1
    )}-${correctDay(new Date(day).getDate())}`;
  } else {
    const date = new Date();
    const dd = String(date.getDate()).padStart(2, "0");
    const mm = String(date.getMonth() + 1).padStart(2, "0");
    const yyyy = date.getFullYear();
    return `${yyyy}-${mm}-${dd}`;
  }
}

export function correctDay(day) {
  if (day < 10) {
    return `0${day}`;
  }
  return day;
}

export function currentMonth() {
  const currentMonth = moment().format("MMMM");

  return currentMonth.charAt(0).toUpperCase() + currentMonth.slice(1);
}

export function currentMonthAndDay(day) {
  return day.format("D MMMM");
}

export function getCorrectDate(day) {
  const months = [
    "января",
    "февраля",
    "марта",
    "апреля",
    "мая",
    "июня",
    "июля",
    "августа",
    "сентября",
    "октября",
    "ноября",
    "декабря"
  ];
  return `${new Date(day).getDate()} ${
    months[new Date(day).getMonth()]
  } ${new Date(day).getFullYear()} года`;
}

export function currentMonthAndDayReportPage() {
  return moment().format("D MMMM");
}

export function hourOfNum(number) {
  const hours = [" час", " часа", " часов"];
  const cases = [2, 0, 1, 1, 1, 2];
  return hours[
    number % 100 > 4 && number % 100 < 20
      ? 2
      : cases[number % 10 < 5 ? number % 10 : 5]
  ];
}