Calculate Week Number

Gets information about the week number of a given date. This information includes the year and month of the week, the week number of the year, and the week number of the month.

• About Week Number
• Install
• Usage
• API
• Interface
• Contributing

Week number according to the ISO-8601 standard, weeks starting on Monday and followed by Tuesday, Wednesday, Thursday, Friday, Saturday, and with Sunday as the seventh and final day.

To know which year or month a week belongs to, we have the following rule: 1 week will belong to the year or month containing more days belonging to that year or month than the other year or month. For example: if a week has the first 3 days in March, but the next 4 days are in April, then that week belongs to April.

You can install it by running:

npm install calc-week-number

or using yarn:

yarn add calc-week-number

import { getWeekNumber, getSunWeekNumber } from 'calc-week-number';

// For the week start with `Monday` (ISO-8601), get information for the week to which 2024/01/01 belongs 
getWeekNumber(new Date(2024, 0, 1)); 
// { "month": 1, "weekOfMonth": 1, "year": 2024, "weekOfYear": 1 }

// For the week start with `Sunday`, get information for the week to which 2024/12/01 belongs  
getSunWeekNumber(new Date(2024, 11, 1)); 
// { "month": 11, "weekOfMonth": 4, "year": 2024, "weekOfYear": 48 }

For the week start with Monday (ISO-8601), return week number info of given date.

• date: given date. Type: Date
• Output: WeekInfoResult

For the week start with Sunday, return week number info of given date.

• date: given date. Type: Date
• Output: WeekInfoResult

@thaibalong7

Please contribute! Look at the issues.