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How to use the addMonths function from date-fns

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

date-fns.addMonths is a function in the date-fns library that adds a specified number of months to a given date and returns a new date object.

box-command.js

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case 'd':
        return dateTime.addDays(date, timeLength);
case 'w':
        return dateTime.addWeeks(date, timeLength);
case 'M':
        return dateTime.addMonths(date, timeLength);
case 'y':
        return dateTime.addYears(date, timeLength);
default:
        throw new Error(`Invalid time unit: ${timeUnit}`);

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getByOrganisation.js

GitHub: UniversityOfHelsinkiCS/palaute

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const organisationAccess = await user.organisationAccess

if (!organisationAccess[organisationCode]?.read) ApplicationError.Forbidden()

const start = startDate ? new Date(startDate) : new Date()
const end = endDate ? new Date(endDate) : addMonths(start, 12)

const feedbackTargets = await FeedbackTarget.findAll({
  attributes: ['id', 'name', 'feedbackCount', 'opensAt', 'closesAt', 'feedbackResponseEmailSent'],
  include: [

How does date-fns.addMonths work?

date-fns.addMonths works by taking a date object and a number of months to add as arguments. The function then calculates a new date object by adding the specified number of months to the original date object. The date-fns.addMonths function is a pure function, which means it does not modify the original date object. Instead, it returns a new date object with the added months. When adding months to a date, date-fns.addMonths adjusts the date accordingly to ensure the result is a valid date. For example, if the original date is February 29th and we add one month, the result will be March 29th in a non-leap year and April 29th in a leap year. The date-fns.addMonths function can also handle negative values for the number of months to subtract from the date. For example, date-fns.addMonths(myDate, -6) would subtract 6 months from myDate and return a new date object. date-fns.addMonths is useful for manipulating dates in applications such as scheduling, billing, and project management where you need to calculate dates that are a certain number of months in the future or past.

DateFns.js

GitHub: tancc/purescript-date-fns

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exports.addDaysImpl = dateFns.addDays
exports.addHoursImpl = dateFns.addHours
exports.addISOYearsImpl = dateFns.addISOYears
exports.addMillisecondsImpl = dateFns.addMilliseconds
exports.addMinutesImpl = dateFns.addMinutes
exports.addMonthsImpl = dateFns.addMonths
exports.addQuartersImpl = dateFns.addQuarters
exports.addSecondsImpl = dateFns.addSeconds
exports.addWeeksImpl = dateFns.addWeeks
exports.addYearsImpl = dateFns.addYears

+ 16 other calls in file

mixin.js

GitHub: brkcnbz/statping

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  return startOfMonth(date)
},
lastDayOfMonth(month) {
  return lastDayOfMonth(month)
},
addMonths(date, amount) {
  return addMonths(date, amount)
},
addSeconds(date, amount) {
  return addSeconds(date, amount)

+ 95 other calls in file

Ai Example

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const { addMonths } = require("date-fns");

// Define a date object
const myDate = new Date("2022-01-31");

// Add 3 months to the date
const result = addMonths(myDate, 3);

console.log(result.toISOString()); // Output: 2022-04-30T00:00:00.000Z

In this example, we start by importing the addMonths function from the date-fns library. We then define a Date object called myDate with the value of January 31st, 2022. Next, we use the addMonths function to add 3 months to myDate and store the result in a new Date object called result. The addMonths function adds 3 months to myDate, taking into account the number of days in each month and whether the year is a leap year, and returns a new Date object with the result. Finally, we use the toISOString method to convert the Date object result into an ISO 8601 string and log the result to the console. The output shows that the result is April 30th, 2022, which is 3 months after the original date of January 31st, 2022.

vue3-datepicker.cjs.js

GitHub: saraIsmailSE/osboha-certificates-modules

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        dateFns.isBefore(props.pageDate, props.lowerLimit)));
const rightDisabled = vue.computed(() => props.upperLimit &&
    (dateFns.isSameMonth(props.upperLimit, props.pageDate) ||
        dateFns.isAfter(props.pageDate, props.upperLimit)));
const previousPage = () => emit('update:pageDate', dateFns.subMonths(props.pageDate, 1));
const nextPage = () => emit('update:pageDate', dateFns.addMonths(props.pageDate, 1));
return {
    weekDays,
    days,
    heading,

+ 9 other calls in file

script.js

GitHub: lukabrxx/calendarPicker

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  })
}


nextMonthButton.addEventListener("click", () => {
    const selectedDate = fromUnixTime(datePickerButton.dataset.selectedDate)
    currentDate = addMonths(currentDate, 1)
    setupDatePicker(selectedDate)
  })
  
  previousMonthButton.addEventListener("click", () => {

deathcountdown.js

GitHub: AyakoBot/Ayako-v1.4

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temp = dateFns.differenceInYears(y, x);
var result = temp + ' years ';
x = dateFns.addYears(x, temp);
temp = dateFns.differenceInMonths(y, x);
result = result + temp + ' months ';
x = dateFns.addMonths(x, temp);
temp = dateFns.differenceInDays(y, x);
result = result + temp + ' days ';
x = dateFns.addDays(x, temp);
temp = dateFns.differenceInHours(y, x);

+ 6 other calls in file

processCalendarEvents.js

GitHub: MatthewHarrigan/on-call

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let timesheetTitle;
let paymentMonth;

if (new Date(start) < submissionCutOff && new Date(end) < submissionCutOff) {
  timesheetTitle = `${previousMonthFormatted} ${currentMonthFormatted}`;
  paymentMonth = addMonths(new Date(submissionCutOff), 1);
} else {
  timesheetTitle = `${currentMonthFormatted} ${nextMonthFormatted}`;
  paymentMonth = addMonths(nextMonth, 1);
}

+ 7 other calls in file

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