getPrevMonthDate

This utility function returns detailed information about the prev month based on the given date. By default, it returns the information for the first day of the prev month.

Features

• The getPrevMonthDate function allows you to retrieve detailed information about the prev month relative to the given date.
• It provides:
  • The year, month, and specific date within the prev month.
  • The first and last dates of the prev month.
  • The day of the week for the specified date, first date, and last date, including both the name and index.
• The function utilizes getNowMonthDate from @dotori-utils/utils to fetch this detailed information.

Types

export const getPrevMonthDate: (now?: Date, date?: number) => {
  year: number;
  month: number;
  date: number;
  firstDate: number;
  lastDate: number;
  day: {
    name:
      { en: { long: 'sunday', short: 'sun' }, kr: { long: '일요일', short: '일' } }
      | { en: { long: 'monday', short: 'mon' }, kr: { long: '월요일', short: '월' } };
      | { en: { long: 'tuesday', short: 'tue' }, kr: { long: '화요일', short: '화' } },
      | { en: { long: 'wednesday', short: 'wed' }, kr: { long: '수요일', short: '수' } },
      | { en: { long: 'thursday', short: 'thu' }, kr: { long: '목요일', short: '목' } },
      | { en: { long: 'friday', short: 'fri' }, kr: { long: '금요일', short: '금' } },
      | { en: { long: 'saturday', short: 'sat' }, kr: { long: '토요일', short: '토' } },
    idx: 0 | 1 | 2 | 3 | 4 | 5 | 6
  };
  firstDay: {
    name:
      { en: { long: 'sunday', short: 'sun' }, kr: { long: '일요일', short: '일' } }
      | { en: { long: 'monday', short: 'mon' }, kr: { long: '월요일', short: '월' } };
      | { en: { long: 'tuesday', short: 'tue' }, kr: { long: '화요일', short: '화' } },
      | { en: { long: 'wednesday', short: 'wed' }, kr: { long: '수요일', short: '수' } },
      | { en: { long: 'thursday', short: 'thu' }, kr: { long: '목요일', short: '목' } },
      | { en: { long: 'friday', short: 'fri' }, kr: { long: '금요일', short: '금' } },
      | { en: { long: 'saturday', short: 'sat' }, kr: { long: '토요일', short: '토' } },
    idx: 0 | 1 | 2 | 3 | 4 | 5 | 6
  };;
  lastDay: {
    name:
      { en: { long: 'sunday', short: 'sun' }, kr: { long: '일요일', short: '일' } }
      | { en: { long: 'monday', short: 'mon' }, kr: { long: '월요일', short: '월' } };
      | { en: { long: 'tuesday', short: 'tue' }, kr: { long: '화요일', short: '화' } },
      | { en: { long: 'wednesday', short: 'wed' }, kr: { long: '수요일', short: '수' } },
      | { en: { long: 'thursday', short: 'thu' }, kr: { long: '목요일', short: '목' } },
      | { en: { long: 'friday', short: 'fri' }, kr: { long: '금요일', short: '금' } },
      | { en: { long: 'saturday', short: 'sat' }, kr: { long: '토요일', short: '토' } },
    idx: 0 | 1 | 2 | 3 | 4 | 5 | 6
  };;
};

Example

// Example 1: Get the first day of the previous month
const firstDayPrevMonth = getPrevMonthDate();
console.log(firstDayPrevMonth); // Output: Date object representing the first day of the previous month

// Example 2: Get the 15th day of the previous month
const fifteenthPrevMonth = getPrevMonthDate(new Date(), 15);
console.log(fifteenthPrevMonth); // Output: Date object representing the 15th day of the previous month