How to use the lastDayOfMonth function from date-fns

Find comprehensive JavaScript date-fns.lastDayOfMonth code examples handpicked from public code repositorys.

date-fns.lastDayOfMonth is a function that returns the last day of a given month.

DateFns.js

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exports.isWeekendImpl = dateFns.isWeekend
exports.isWithinRangeImpl = dateFns.isWithinRange
exports.isYesterdayImpl = dateFns.isYesterday
exports.lastDayOfISOWeekImpl = dateFns.lastDayOfISOWeek
exports.lastDayOfISOYearImpl = dateFns.lastDayOfISOYear
exports.lastDayOfMonthImpl = dateFns.lastDayOfMonth
exports.lastDayOfQuarterImpl = dateFns.lastDayOfQuarter
exports.lastDayOfWeekImpl = dateFns.lastDayOfWeek
exports.lastDayOfYearImpl = dateFns.lastDayOfYear
exports.maxImpl = function(dates) {

+ 16 other calls in file

getIssueCountsByStatusAndMonth.js

GitHub: jolewis-ddn/jira-status-reporter

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let END_DATE = null
if (MON == datefns.getMonth(TODAY)) {
    // Set end date to yesterday
    END_DATE = datefns.subDays(TODAY, 1)
} else {
    END_DATE = datefns.lastDayOfMonth(START_DATE)
}

const dateList = datefns.eachDayOfInterval({
    start: START_DATE,

How does date-fns.lastDayOfMonth work?

The lastDayOfMonth function from the date-fns library takes a date and returns the last day of the month for that date, accounting for leap years and daylight savings time. It works by using the getMonth and getFullYear functions to determine the current month and year of the given date, then creating a new date object for the first day of the next month and subtracting one day to get the last day of the current month.

mixin.js

GitHub: brkcnbz/statping

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},
ago(t1) {
  return formatDistanceToNow(parseISO(t1))
},
daysInMonth(t1) {
  return lastDayOfMonth(t1)
},
nowSubtract(seconds) {
  return subSeconds(this.now(), seconds)
},

+ 143 other calls in file

index.js

GitHub: beno1234/back-test

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  );
});


app.post("/data", (req, res) => {
  const currentDate = new Date().toISOString().slice(0, 10);
  const lastDayOfMonth = lastDayOfMonth(new Date()).toISOString().slice(0, 10);


  db.query(
    "INSERT INTO teste (data_inicio, data_fim) VALUES (?, ?)",
    [currentDate, lastDayOfMonth],

Ai Example

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import { lastDayOfMonth } from "date-fns";

const result = lastDayOfMonth(new Date("2022-04-15")); // Returns a Date object for April 30, 2022

In this example, lastDayOfMonth is used to calculate the last day of the month for a given date. The function takes a Date object as its argument and returns a new Date object representing the last day of the month for the given date. In this case, the Date object representing April 15, 2022 is passed as an argument, and the function returns a new Date object representing April 30, 2022.

date-fns-javascript-date-library.md?plain=1

GitHub: apachecn/sitepoint-blog-zh

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当然这是可行的，但是`getMonth`后面的数字代表什么并不明显。现在对比一下可读性更强的:

```
const today = new Date();
console.log( lastDayOfMonth(today) ); 
```

这个`lastDayOfMonth`方法是由 [date-fns](https://date-fns.org/) 提供的，它自称是一个用于在浏览器和 Node.js 中操作 JavaScript 日期的综合工具集

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