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How to use the add function from date-fns

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

date-fns.add is a function in the date-fns library for JavaScript that adds a specified amount of time to a given date object and returns a new date object.

Calendar.js

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if (set) {
  final = datefns.set(final, set);
}

if (diff) {
  final = datefns.add(final, diff); // date-fns.add() supports negative numbers as well
}

if (format) {
  try {

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+ 3 other calls in file

checkAlerts.js

GitHub: chartbrew/chartbrew

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  if (alert.events.length === 0) {
    return true;
  }

  const lastEvent = alert.events[0];
  const timeout = add(new Date(lastEvent.createdAt), { seconds: alert.timeout });
  return isPast(timeout);
});

const { chartData, Datasets } = chart;

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How does date-fns.add work?

The date-fns.add function in the date-fns library for JavaScript is used to add a specified amount of time to a given date object and return a new date object. When called, date-fns.add takes two arguments: a date object representing the starting date, and an object representing the amount of time to add. The amount of time to add is specified using a set of properties, such as years, months, weeks, days, hours, minutes, and seconds. Each property should be an integer value indicating the amount of time to add. For example, to add 2 years, 3 months, and 4 days to a given date, you would call date-fns.add like this: php Copy code {{{{{{{ class="!whitespace-pre hljs language-php">const date = new Date(); const newDate = dateFns.add(date, { years: 2, months: 3, days: 4 }); date-fns.add returns a new Date object that represents the resulting date and time after the specified amount of time has been added to the starting date. The original date object is not modified. It's important to note that date-fns.add uses a "pure" functional programming approach, which means that it does not modify the input date object, and instead returns a new date object with the added time. This can help prevent bugs and make it easier to reason about the behavior of the function. In summary, date-fns.add is a function in the date-fns library for JavaScript that adds a specified amount of time to a given date object and returns a new date object. The amount of time to add is specified using an object with properties such as years, months, weeks, days, hours, minutes, and seconds.

timerender.js

GitHub: Amaranese/40-Projects-Ideas-For-Web-Developer

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});


run_test("render_now_returns_yesterday", () => {
    const today = date_2019;


    const yesterday = add(today, {days: -1});
    const expected = {
        time_str: $t({defaultMessage: "Yesterday"}),
        formal_time_str: "Thursday, April 11, 2019",
        needs_update: true,

+ 23 other calls in file

index.js

GitHub: jcsj2/bbtsnodejs

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novaData = new Date()

console.log(dateFns.format(novaData, "dd 'de' MMMM yyyy HH:mm:ss"))

// imutabilidade
const dataComDiasAdicionados = dateFns.add(novaData, {
    days: 4
})

console.log('novaData ', novaData)

Ai Example

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const dateFns = require("date-fns");

// Create a date object representing the current date and time
const date = new Date();

// Add 2 years, 3 months, and 4 days to the current date
const newDate = dateFns.add(date, {
  years: 2,
  months: 3,
  days: 4,
});

// Log the original date and the new date to the console
console.log(`Original date: ${date}`);
console.log(`New date: ${newDate}`);

In this example, we first create a date object representing the current date and time using the Date constructor. We then call date-fns.add with the current date object and an object specifying the amount of time to add. In this case, we add 2 years, 3 months, and 4 days to the current date. date-fns.add returns a new date object that represents the resulting date and time after the specified amount of time has been added to the starting date. Finally, we log the original date and the new date to the console using template literals to display the dates as strings.

notifications.js

GitHub: havandenberg/jv-system

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const DEFAULT_VESSEL_CONTROL_DAYS_UNTIL_DUE = 45;


const getVesselControlDueDate = (vessel, shipper) =>
  vessel.dischargeDate
    ? add(new Date(vessel.dischargeDate.replace(/-/g, '/')), {
        days:
          shipper.vesselControlDaysUntilDue ||
          DEFAULT_VESSEL_CONTROL_DAYS_UNTIL_DUE,
      })

+ 44 other calls in file

index.js

GitHub: vivekUnico/cms-vivek

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} else {
  if (key == "name" || key == "mobile" || key == "last_followup.comment") {
    temp.push({ [key]: { $regex: req.query[key] } });
  } else if (key.includes("addedTime")) {
    let date = parseISO(req.query[key]);
    let date2 = add(date, { days: 1 });
    temp.push({ "last_followup.addedTime": { $gte: date, $lt: date2 } });
  } else if (key == "followup_list_length") {
    temp.push({ [key]: Number(req.query[key]) });
  }

+ 36 other calls in file

SubjectTimeDetails.js

GitHub: vivekUnico/cms-vivek

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if (["batch._id", "center._id", "teacher._id"].includes(key))
	Filter.push({ [key]: ObjectId(req.query[key]) });
else if (key == "start_time") {
	Filter.push({ start_time: { $gte: parseISO(req.query[key]) } });
} else if (key == "end_time") {
	Filter.push({ start_time: { $lt: add(parseISO(req.query[key]), { days: 1 }) } });
} else if (key == "topics") {
	temp = req.query[key]?.split(",").map((item) => ({ "topics": item }));
} else if (key == "ActualStatus") {
	Filter.push({ [key]: (req.query[key] == "true") ? true : false });

+ 33 other calls in file

displayController.js

GitHub: protonvert/to-do-list

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try {
  let taskName = document.getElementById('task-name').value

  // add day function is to fix the timeone offset I was encountering,
  // causing the selected date to be a day behind
  let taskDueDate = add(
    new Date(document.getElementById('task-duedate').value),
    { days: 1 }
  )
  if (taskDueDate == 'Invalid Date') {

+ 14 other calls in file

a.js

GitHub: flaviopcsilva/meus-exercicios2

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    days: 2
}));


console.log(data);


const novaData = add(data, {
    days: 45,
    years: 2
});
console.log(novaData);

+ 4 other calls in file

index.js

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

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//Método add
//Faz operações aritiméticas (somar/subtrair) de um objeto de data. Ele não modifica o objeto original, cria um novo.
const addDate = new Date(2017, 3, 12);
console.log("new Date():", addDate);
//Mais 2 segundos, 1 dia e 10 anos
const newAddDate = add(addDate, {
    seconds: 2,
    days: 1,
    years: 10
});

timerender.test.js

GitHub: zulip/zulip

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        assert.equal(actualDate, format.expected.date);
    }
});


run_test("get_localized_date_or_time_for_format returns correct localized date", () => {
    const date = add(date_2019, {years: -1});
    const languages = [
        {
            language: "en",
            expected: {

+ 23 other calls in file

demo.js

GitHub: jwhutchison/time-js

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console.log('d.M.yyyy HH:mm:ss.SSS GMT XXX (z)', format(fnsDateZoned, 'd.M.yyyy HH:mm:ss.SSS GMT XXX (z)'));
console.log('LLL d, yyyy', format(fnsDateZoned, 'LLL d, yyyy'));

// Relative dates
const fnsDate30Days = add(fnsDate, { days: 30 });

console.log('+30 days', format(fnsDate30Days, 'LLL d, yyyy'));
console.log('relative', formatRelative(fnsDate30Days, fnsDate30Days));
console.log('duration', formatDistance(fnsDate30Days, fnsDate));

Other functions in date-fns

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