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How to use the isBefore function from date-fns

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

date-fns.isBefore is a function that checks whether a date is before another date.

.eleventy.js

GitHub: LunchDevCommunity/community-calendar

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});

eleventyConfig.addCollection('pastEvents', (collectionApi) => {
        return collectionApi
                .getFilteredByGlob('./src/schedule/*.md')
                .filter((event) => isValidEvent(event) && isBefore(new Date(event.data.date), new Date()));
});

eleventyConfig.addCollection('upcomingEvents', (collectionApi) => {
        const serverEvents = collectionApi

schedule.11tydata.js

GitHub: LunchDevCommunity/community-calendar

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module.exports = {
        eleventyComputed: {
                calendarLinks: {
                        isPastEvent: ({ date: start }) => {
                                return isBefore(new Date(), new Date(start));
                        },
                        googleLink: ({ title, description, date: start }) => {
                                return google({
                                        title,

How does date-fns.isBefore work?

date-fns.isBefore is a function that checks if the first date is before the second date based on their values, taking into account their timezones, and returns a boolean value. It first normalizes the input dates by converting them into Date objects. Then, it compares the timestamps of the two dates and returns true if the first date is before the second date. If the timestamps are equal, it checks if the first date is in an earlier timezone than the second date and returns true if it is. If the timestamps and timezones are equal, it returns false.

management.controller.js

GitHub: Szelestey/Group3-Inc

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// Add amount to YTD number
yearData.ytd += payment.amount;

// Check if payment is same month and <= current date
if(dateFns.isSameMonth(paymentDate, currDate) &&
    (dateFns.isSameDay(paymentDate, currDate) || dateFns.isBefore(paymentDate, currDate))) {

  // Add amount to MTD number
  yearData.mtd += payment.amount;
}

datetime.js

GitHub: colbyfayock/space-jelly-cron

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 * dateIsPast
 */

function dateIsPast(date) {
  const parsed = parseISO(date);
  return isBefore(parsed, new Date().getTime());
}

module.exports.dateIsPast = dateIsPast;

Ai Example

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

const date1 = new Date(2022, 0, 1); // January 1, 2022
const date2 = new Date(2023, 0, 1); // January 1, 2023

if (isBefore(date1, date2)) {
  console.log("date1 is before date2");
} else {
  console.log("date1 is after date2");
}

In this example, isBefore is used to compare two dates and determine if date1 is before date2. If it is, the function logs 'date1 is before date2' to the console.

index.js

GitHub: bmilcs/odin-javascript-final-project

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const getDateObj = (dateString) => parse(dateString, 'yyyy-MM-dd', new Date());
const formatDate = (dateObj) => format(dateObj, 'yyyy-MM-dd');


const isAFutureDate = (dateString) => {
  const date = getDateObj(dateString);
  return isBefore(getTodayObj(), date);
};


const isToday = (dateString) => {
  const date = getDateObj(dateString);

+ 64 other calls in file

index.js

GitHub: heshammourad/vexillology-contests

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  if (isBefore(now, voteStart)) {
    logger.error('Requesting contest before voting window opened');
    res.status(404).send('Contest voting window is not open yet');
    return;
  }
  response.isContestMode = isBefore(now, voteEnd);
  response.voteEnd = voteEnd;
}

if (response.isContestMode && !winnersThreadId) {

+ 24 other calls in file

DateFns.js

GitHub: tancc/purescript-date-fns

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exports.getQuarterImpl = dateFns.getQuarter
exports.getSecondsImpl = dateFns.getSeconds
exports.getTimeImpl = dateFns.getTime
exports.getYearImpl = dateFns.getYear
exports.isAfterImpl = dateFns.isAfter
exports.isBeforeImpl = dateFns.isBefore
exports.isDateImpl = dateFns.isDate
exports.isEqualImpl = dateFns.isEqual
exports.isFirstDayOfMonthImpl = dateFns.isFirstDayOfMonth
exports.isFridayImpl = dateFns.isFriday

+ 16 other calls in file

.eleventy.js

GitHub: gdunzwolff/neat-starter

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eleventyConfig.addCollection('pastEvents', collection => {
  return collection
    .getFilteredByTag('event')
    //.getFilteredByGlob('./src/veranstaltungen/*.md')
    .filter((veranstaltung) => isBefore(new Date(veranstaltung.data.date), new Date()));
});

// human readable date
eleventyConfig.addFilter("readableDate", (dateObj) => {

index.js

GitHub: bmilcs/odin-javascript-final-project

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const getToday = () => new Date();
const parseDate = (dateString) => parse(dateString, 'yyyy-MM-dd', new Date());


const isAFutureDate = (dateString) => {
  const date = parseDate(dateString);
  return isBefore(getToday(), date);
};


const isToday = (dateString) => {
  const date = parseDate(dateString);

+ 11 other calls in file

notifications.js

GitHub: havandenberg/jv-system

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    unpaid?.invoice?.paidCode !== 'P' && !unpaid?.isApproved,
);

const dueDate =
  vessel && shipper && getVesselControlDueDate(vessel, shipper);
const isPast = dueDate && isBefore(dueDate, startOfWeek);
const isCurrent =
  dueDate &&
  isDateGreaterThanOrEqualTo(dueDate, startOfWeek) &&
  isDateLessThanOrEqualTo(dueDate, endOfWeek);

daily-report.js

GitHub: ovik94/server-hash-arm

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if (req.query.to) {
  result = result.filter(item => {
    if (item.date === req.query.to) {
      return true;
    }
    return isBefore(transformedDate(item.date), transformedDate(req.query.to));
  });
}

return res.json({ status: "OK", data: result });

+ 24 other calls in file

a.js

GitHub: flaviopcsilva/meus-exercicios2

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const data1 = new Date(2023, 0, 5, 12, 45);
const data2 = new Date(2023, 0, 8, 12, 35);
const metIsAfter = isAfter(data2, data1);
console.log(metIsAfter);


const metIsBefore = isBefore(data2, data1);
console.log(metIsBefore);


// Metodos startOf- zera depois do incremento
//metodos endOf-todos os que vem depois fica no limite

+ 4 other calls in file

vue3-datepicker.cjs.js

GitHub: saraIsmailSE/osboha-certificates-modules

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    const end = dateFns.getYear(to.value);
    return `${start} - ${end}`;
});
const leftDisabled = vue.computed(() => props.lowerLimit &&
    (dateFns.getDecade(props.lowerLimit) === dateFns.getDecade(props.pageDate) ||
        dateFns.isBefore(props.pageDate, props.lowerLimit)));
const rightDisabled = vue.computed(() => props.upperLimit &&
    (dateFns.getDecade(props.upperLimit) === dateFns.getDecade(props.pageDate) ||
        dateFns.isAfter(props.pageDate, props.upperLimit)));
const previousPage = () => emit('update:pageDate', dateFns.subYears(props.pageDate, 10));

+ 49 other calls in file

index.js

GitHub: luisoliveira-jr/JavaScript-exercicios-backend-uso-de-datas-no-javascript

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    new Date(1987, 1, 11));
console.log("isAfter:", depois);


//Método isBefore
//Nesse exemplo verifica se uma data é antes da outra
const antes = isBefore(
    new Date(1989, 6, 10),
    new Date(1987, 1, 11));
console.log("isBefore:", antes);

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