feat(shared): add constants and utils

src/shared/constants/date.js

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+export const MONTHS = {
+  JANUARY: 0,
+  FEBRUARY: 1,
+  MARCH: 2,
+  APRIL: 3,
+  MAY: 4,
+  JUNE: 5,
+  JULY: 6,
+  AUGUST: 7,
+  SEPTEMBER: 8,
+  OCTOBER: 9,
+  NOVEMBER: 10,
+  DECEMBER: 11,
+};
+
+export const DAYS_IN_WEEK = 7;
+
+export const WEEK_DAYS = {
+  SUNDAY: 0,
+  MONDAY: 1,
+  TUESDAY: 2,
+  WEDNESDAY: 3,
+  THURSDAY: 4,
+  FRIDAY: 5,
+  SATURDAY: 6,
+};

src/shared/constants/index.js

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+export { DAYS_IN_WEEK, MONTHS, WEEK_DAYS } from './date';
+export { MONTHS_LABEL, WEEK_DAYS_LABEL } from './locale';

src/shared/constants/locale.js

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+import { MONTHS, WEEK_DAYS } from './date';
+
+export const MONTHS_LABEL = {
+  [MONTHS.JANUARY]: {
+    ru: 'Январь',
+    en: 'January',
+  },
+  [MONTHS.FEBRUARY]: {
+    ru: 'Февраль',
+    en: 'February',
+  },
+  [MONTHS.MARCH]: {
+    ru: 'Март',
+    en: 'March',
+  },
+  [MONTHS.APRIL]: {
+    ru: 'Апрель',
+    en: 'April',
+  },
+  [MONTHS.MAY]: {
+    ru: 'Май',
+    en: 'May',
+  },
+  [MONTHS.JUNE]: {
+    ru: 'Июнь',
+    en: 'June',
+  },
+  [MONTHS.JULY]: {
+    ru: 'Июль',
+    en: 'July',
+  },
+  [MONTHS.AUGUST]: {
+    ru: 'Август',
+    en: 'August',
+  },
+  [MONTHS.SEPTEMBER]: {
+    ru: 'Сентябрь',
+    en: 'September',
+  },
+  [MONTHS.OCTOBER]: {
+    ru: 'Октябрь',
+    en: 'October',
+  },
+  [MONTHS.NOVEMBER]: {
+    ru: 'Ноябрь',
+    en: 'November',
+  },
+  [MONTHS.DECEMBER]: {
+    ru: 'Декабрь',
+    en: 'December',
+  },
+};
+
+export const WEEK_DAYS_LABEL = {
+  [WEEK_DAYS.SUNDAY]: {
+    ru: {
+      full: 'Воскресенье',
+      short: 'Вс',
+    },
+    en: {
+      full: 'Sunday',
+      short: 'Sun',
+    },
+  },
+  [WEEK_DAYS.MONDAY]: {
+    ru: {
+      full: 'Понедельник',
+      short: 'Пн',
+    },
+    en: {
+      full: 'Monday',
+      short: 'Mon',
+    },
+  },
+  [WEEK_DAYS.TUESDAY]: {
+    ru: {
+      full: 'Вторник',
+      short: 'Вт',
+    },
+    en: {
+      full: 'Tuesday',
+      short: 'Tue',
+    },
+  },
+  [WEEK_DAYS.WEDNESDAY]: {
+    ru: {
+      full: 'Среда',
+      short: 'Ср',
+    },
+    en: {
+      full: 'Wednesday',
+      short: 'Wed',
+    },
+  },
+  [WEEK_DAYS.THURSDAY]: {
+    ru: {
+      full: 'Четверг',
+      short: 'Чт',
+    },
+    en: {
+      full: 'Thursday',
+      short: 'Thu',
+    },
+  },
+  [WEEK_DAYS.FRIDAY]: {
+    ru: {
+      full: 'Пятница',
+      short: 'Пт',
+    },
+    en: {
+      full: 'Friday',
+      short: 'Fri',
+    },
+  },
+  [WEEK_DAYS.SATURDAY]: {
+    ru: {
+      full: 'Суббота',
+      short: 'Сб',
+    },
+    en: {
+      full: 'Saturday',
+      short: 'Sat',
+    },
+  },
+};

src/shared/utils/date/date.js

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+export const firstDayOfMonthDate = (date) => {
+  const monthIndex = date.getMonth();
+  const year = date.getFullYear();
+
+  return new Date(year, monthIndex, 1);
+};
+
+export const lastDayOfMonthDate = (date) => {
+  const monthIndex = date.getMonth();
+  const year = date.getFullYear();
+
+  return new Date(year, monthIndex + 1, 0);
+};

src/shared/utils/date/date.spec.js

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+import { firstDayOfMonthDate, lastDayOfMonthDate } from './date';
+
+describe('Check firstDayOfMonthDate func', () => {
+  test('Check middle of month', () => {
+    const date = new Date(2022, 7, 15);
+    const result = new Date(2022, 7, 1);
+    expect(firstDayOfMonthDate(date)).toEqual(result);
+  });
+
+  test('Check end of year', () => {
+    const date = new Date(2024, 11, 31);
+    const result = new Date(2024, 11, 1);
+    expect(firstDayOfMonthDate(date)).toEqual(result);
+  });
+
+  test('Check start of year', () => {
+    const date = new Date(2024, 0, 0);
+    const result = new Date(2023, 11, 1);
+    expect(firstDayOfMonthDate(date)).toEqual(result);
+  });
+
+  test('Check with 0 date', () => {
+    const date = new Date(2023, 12, 0);
+    const result = new Date(2023, 11, 1);
+    expect(firstDayOfMonthDate(date)).toEqual(result);
+  });
+
+  test('Check with extra month', () => {
+    const date = new Date(2023, 12, 1);
+    const result = new Date(2024, 0, 1);
+    expect(firstDayOfMonthDate(date)).toEqual(result);
+  });
+
+  test('Check with extra date', () => {
+    const date = new Date(2023, 11, 33);
+    const result = new Date(2024, 0, 1);
+    expect(firstDayOfMonthDate(date)).toEqual(result);
+  });
+
+  test('Check with extra date and month', () => {
+    const date = new Date(2023, 12, 33);
+    const result = new Date(2024, 1, 1);
+    expect(firstDayOfMonthDate(date)).toEqual(result);
+  });
+});
+
+describe('Check lastDayOfMonthDate func', () => {
+  test('Check middle of month', () => {
+    const date = new Date(2022, 7, 15);
+    const result = new Date(2022, 7, 31);
+    expect(lastDayOfMonthDate(date)).toEqual(result);
+  });
+
+  test('Check end of year', () => {
+    const date = new Date(2024, 11, 31);
+    const result = new Date(2024, 11, 31);
+    expect(lastDayOfMonthDate(date)).toEqual(result);
+  });
+
+  test('Check start of year', () => {
+    const date = new Date(2024, 0, 0);
+    const result = new Date(2023, 11, 31);
+    expect(lastDayOfMonthDate(date)).toEqual(result);
+  });
+
+  test('Check with 0 date', () => {
+    const date = new Date(2023, 12, 0);
+    const result = new Date(2023, 11, 31);
+    expect(lastDayOfMonthDate(date)).toEqual(result);
+  });
+
+  test('Check with extra month', () => {
+    const date = new Date(2023, 12, 1);
+    const result = new Date(2024, 0, 31);
+    expect(lastDayOfMonthDate(date)).toEqual(result);
+  });
+
+  test('Check with extra date', () => {
+    const date = new Date(2023, 11, 33);
+    const result = new Date(2024, 0, 31);
+    expect(lastDayOfMonthDate(date)).toEqual(result);
+  });
+
+  test('Check with extra date and month', () => {
+    const date = new Date(2023, 12, 33);
+    const result = new Date(2024, 1, 29);
+    expect(lastDayOfMonthDate(date)).toEqual(result);
+  });
+});

src/shared/utils/date/index.js

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+export {
+  lastDayOfMonthDate,
+  firstDayOfMonthDate,
+} from './date';