Commit 2c963353 authored by Nathan Friend's avatar Nathan Friend Committed by Enrique Alcántara

Add new datetime utilities

This commit updates ~/lib/utils/datetime_utility.js to include new
utilities for computing relative dates.
parent d90f39af
......@@ -681,6 +681,34 @@ export const secondsToHours = (offset) => {
export const nDaysAfter = (date, numberOfDays) =>
new Date(newDate(date)).setDate(date.getDate() + numberOfDays);
/**
* Returns the date n days before the date provided
*
* @param {Date} date the initial date
* @param {Number} numberOfDays number of days before
* @return {Date} the date preceding the date provided
*/
export const nDaysBefore = (date, numberOfDays) => nDaysAfter(date, -numberOfDays);
/**
* Returns the date n months after the date provided
*
* @param {Date} date the initial date
* @param {Number} numberOfMonths number of months after
* @return {Date} the date following the date provided
*/
export const nMonthsAfter = (date, numberOfMonths) =>
new Date(newDate(date)).setMonth(date.getMonth() + numberOfMonths);
/**
* Returns the date n months before the date provided
*
* @param {Date} date the initial date
* @param {Number} numberOfMonths number of months before
* @return {Date} the date preceding the date provided
*/
export const nMonthsBefore = (date, numberOfMonths) => nMonthsAfter(date, -numberOfMonths);
/**
* Returns the date after the date provided
*
......
......@@ -608,6 +608,92 @@ describe('secondsToDays', () => {
});
});
describe('nDaysAfter', () => {
const date = new Date('2019-07-16T00:00:00.000Z');
it.each`
numberOfDays | expectedResult
${1} | ${new Date('2019-07-17T00:00:00.000Z').valueOf()}
${90} | ${new Date('2019-10-14T00:00:00.000Z').valueOf()}
${-1} | ${new Date('2019-07-15T00:00:00.000Z').valueOf()}
${0} | ${date.valueOf()}
${0.9} | ${date.valueOf()}
`('returns $numberOfDays day(s) after the provided date', ({ numberOfDays, expectedResult }) => {
expect(datetimeUtility.nDaysAfter(date, numberOfDays)).toBe(expectedResult);
});
});
describe('nDaysBefore', () => {
const date = new Date('2019-07-16T00:00:00.000Z');
it.each`
numberOfDays | expectedResult
${1} | ${new Date('2019-07-15T00:00:00.000Z').valueOf()}
${90} | ${new Date('2019-04-17T00:00:00.000Z').valueOf()}
${-1} | ${new Date('2019-07-17T00:00:00.000Z').valueOf()}
${0} | ${date.valueOf()}
${0.9} | ${new Date('2019-07-15T00:00:00.000Z').valueOf()}
`('returns $numberOfDays day(s) before the provided date', ({ numberOfDays, expectedResult }) => {
expect(datetimeUtility.nDaysBefore(date, numberOfDays)).toBe(expectedResult);
});
});
describe('nMonthsAfter', () => {
// February has 28 days
const feb2019 = new Date('2019-02-15T00:00:00.000Z');
// Except in 2020, it had 29 days
const feb2020 = new Date('2020-02-15T00:00:00.000Z');
// April has 30 days
const apr2020 = new Date('2020-04-15T00:00:00.000Z');
// May has 31 days
const may2020 = new Date('2020-05-15T00:00:00.000Z');
it.each`
date | numberOfMonths | expectedResult
${feb2019} | ${1} | ${new Date('2019-03-15T00:00:00.000Z').valueOf()}
${feb2020} | ${1} | ${new Date('2020-03-15T00:00:00.000Z').valueOf()}
${apr2020} | ${1} | ${new Date('2020-05-15T00:00:00.000Z').valueOf()}
${may2020} | ${1} | ${new Date('2020-06-15T00:00:00.000Z').valueOf()}
${may2020} | ${12} | ${new Date('2021-05-15T00:00:00.000Z').valueOf()}
${may2020} | ${-1} | ${new Date('2020-04-15T00:00:00.000Z').valueOf()}
${may2020} | ${0} | ${may2020.valueOf()}
${may2020} | ${0.9} | ${may2020.valueOf()}
`(
'returns $numberOfMonths month(s) after the provided date',
({ date, numberOfMonths, expectedResult }) => {
expect(datetimeUtility.nMonthsAfter(date, numberOfMonths)).toBe(expectedResult);
},
);
});
describe('nMonthsBefore', () => {
// The previous month (February) has 28 days
const march2019 = new Date('2019-03-15T00:00:00.000Z');
// Except in 2020, it had 29 days
const march2020 = new Date('2020-03-15T00:00:00.000Z');
// The previous month (April) has 30 days
const may2020 = new Date('2020-05-15T00:00:00.000Z');
// The previous month (May) has 31 days
const june2020 = new Date('2020-06-15T00:00:00.000Z');
it.each`
date | numberOfMonths | expectedResult
${march2019} | ${1} | ${new Date('2019-02-15T00:00:00.000Z').valueOf()}
${march2020} | ${1} | ${new Date('2020-02-15T00:00:00.000Z').valueOf()}
${may2020} | ${1} | ${new Date('2020-04-15T00:00:00.000Z').valueOf()}
${june2020} | ${1} | ${new Date('2020-05-15T00:00:00.000Z').valueOf()}
${june2020} | ${12} | ${new Date('2019-06-15T00:00:00.000Z').valueOf()}
${june2020} | ${-1} | ${new Date('2020-07-15T00:00:00.000Z').valueOf()}
${june2020} | ${0} | ${june2020.valueOf()}
${june2020} | ${0.9} | ${new Date('2020-05-15T00:00:00.000Z').valueOf()}
`(
'returns $numberOfMonths month(s) before the provided date',
({ date, numberOfMonths, expectedResult }) => {
expect(datetimeUtility.nMonthsBefore(date, numberOfMonths)).toBe(expectedResult);
},
);
});
describe('approximateDuration', () => {
it.each`
seconds
......
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