Feat/get interval

src/js/get-interval-from-now-formatted/get-interval-from-now-formatted.spec.js

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+import { expect, it, describe, vi, beforeEach } from 'vitest';
+import getIntevalFromNowFormatted, { INTERVAL_DATE_ERR } from '.';
+
+describe('getRemainingTimeFormatted', () => {
+  beforeEach(() => {
+    vi.useFakeTimers();
+  });
+
+  it('should return formatted time remaining in the future', () => {
+    const futureDate = new Date(Date.now() + 1000 * 60 * 60 * 24); // 1 day in the future
+    const locale = 'en-US';
+    const result = getIntevalFromNowFormatted(futureDate, locale);
+    expect(result).toBe('in 1 day');
+  });
+
+  it('should return formatted time remaining in the past', () => {
+    const pastDate = new Date(Date.now() - 1000 * 60 * 60 * 24); // 1 day in the past
+    const locale = 'en-US';
+    const result = getIntevalFromNowFormatted(pastDate, locale);
+    expect(result).toBe('1 day ago');
+  });
+
+  it('should return formatted time for 12 hours in the future', () => {
+    const futureDate = new Date(Date.now() + 1000 * 60 * 60 * 12); // 12 hours in the future
+    const locale = 'en-US';
+    const result = getIntevalFromNowFormatted(futureDate, locale);
+    expect(result).toBe('in 12 hours');
+  });
+
+  it('should return formatted time for 12 minutes in the future', () => {
+    const futureDate = new Date(Date.now() + 1000 * 60 * 12); // 12 minutes in the future
+    const locale = 'en-US';
+    const result = getIntevalFromNowFormatted(futureDate, locale);
+    expect(result).toBe('in 12 minutes');
+  });
+
+  it('should return formatted time in Portuguese', () => {
+    const futureDate = new Date(Date.now() + 1000 * 60 * 60 * 24); // 1 day in the future
+    const locale = 'pt-BR';
+    const result = getIntevalFromNowFormatted(futureDate, locale);
+    expect(result).toBe('em 1 dia');
+  });
+
+  it('should return formatted time in Europe Portuguese', () => {
+    const futureDate = new Date(Date.now() + 1000 * 60 * 60 * 24); // 1 day in the future
+    const locale = 'pt-PT';
+    const result = getIntevalFromNowFormatted(futureDate, locale);
+    expect(result).toBe('dentro de 1 dia');
+  });
+
+  it('should return formatted time in Spanish', () => {
+    const futureDate = new Date(Date.now() + 1000 * 60 * 60 * 24); // 1 day in the future
+    const locale = 'es-ES';
+    const result = getIntevalFromNowFormatted(futureDate, locale);
+    expect(result).toBe('dentro de 1 día');
+  });
+
+  it('should throw for invalid date', () => {
+    const invalidDate = new Date('invalid-date');
+    const locale = 'en-US';
+    expect(() => getIntevalFromNowFormatted(invalidDate, locale)).toThrowError(
+      INTERVAL_DATE_ERR
+    );
+  });
+});

src/js/get-interval-from-now-formatted/index.js

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+export const INTERVAL_DATE_ERR =
+  'Invalid date provided. Please provide a valid Date object.';
+
+/**
+ * Formats the time interval between the given date and the current date
+ * into a human-readable relative time string.
+ *
+ * @param {Date} date - The target date to calculate the interval from now.
+ * @param {string} locale - A string with a BCP 47 language tag to specify the locale for formatting.
+ * @returns {string} A formatted string representing the relative time interval.
+ * @throws {TypeError} Throws an error if the provided date is not a valid Date object.
+ */
+export default function getIntervalFromNowFormatted(date, locale) {
+  if (!(date instanceof Date) || isNaN(date.getTime())) {
+    throw new TypeError(INTERVAL_DATE_ERR);
+  }
+
+  const now = new Date();
+  const diffMs = date.getTime() - now.getTime();
+
+  const rtf = new Intl.RelativeTimeFormat(locale, { numeric: 'always' });
+
+  const seconds = diffMs / 1000;
+  const minutes = seconds / 60;
+  const hours = minutes / 60;
+  const days = hours / 24;
+
+  if (Math.abs(days) >= 1) {
+    return rtf.format(Math.round(days), 'day');
+  }
+
+  if (Math.abs(hours) >= 1) {
+    return rtf.format(Math.round(hours), 'hour');
+  }
+
+  if (Math.abs(minutes) >= 1) {
+    return rtf.format(Math.round(minutes), 'minute');
+  }
+
+  return rtf.format(Math.round(seconds), 'second');
+}

src/ts/get-interval-from-now-formatted/get-interval-from-now-formatted.spec.ts

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+import { expect, it, describe, vi, beforeEach } from 'vitest';
+import getIntevalFromNowFormatted, { INTERVAL_DATE_ERR } from '.';
+
+describe('getRemainingTimeFormatted', () => {
+  beforeEach(() => {
+    vi.useFakeTimers();
+  });
+
+  it('should return formatted time remaining in the future', () => {
+    const futureDate = new Date(Date.now() + 1000 * 60 * 60 * 24); // 1 day in the future
+    const locale = 'en-US';
+    const result = getIntevalFromNowFormatted(futureDate, locale);
+    expect(result).toBe('in 1 day');
+  });
+
+  it('should return formatted time remaining in the past', () => {
+    const pastDate = new Date(Date.now() - 1000 * 60 * 60 * 24); // 1 day in the past
+    const locale = 'en-US';
+    const result = getIntevalFromNowFormatted(pastDate, locale);
+    expect(result).toBe('1 day ago');
+  });
+
+  it('should return formatted time for 12 hours in the future', () => {
+    const futureDate = new Date(Date.now() + 1000 * 60 * 60 * 12); // 12 hours in the future
+    const locale = 'en-US';
+    const result = getIntevalFromNowFormatted(futureDate, locale);
+    expect(result).toBe('in 12 hours');
+  });
+
+  it('should return formatted time for 12 minutes in the future', () => {
+    const futureDate = new Date(Date.now() + 1000 * 60 * 12); // 12 minutes in the future
+    const locale = 'en-US';
+    const result = getIntevalFromNowFormatted(futureDate, locale);
+    expect(result).toBe('in 12 minutes');
+  });
+
+  it('should return formatted time in Portuguese', () => {
+    const futureDate = new Date(Date.now() + 1000 * 60 * 60 * 24); // 1 day in the future
+    const locale = 'pt-BR';
+    const result = getIntevalFromNowFormatted(futureDate, locale);
+    expect(result).toBe('em 1 dia');
+  });
+
+  it('should return formatted time in Europe Portuguese', () => {
+    const futureDate = new Date(Date.now() + 1000 * 60 * 60 * 24); // 1 day in the future
+    const locale = 'pt-PT';
+    const result = getIntevalFromNowFormatted(futureDate, locale);
+    expect(result).toBe('dentro de 1 dia');
+  });
+
+  it('should return formatted time in Spanish', () => {
+    const futureDate = new Date(Date.now() + 1000 * 60 * 60 * 24); // 1 day in the future
+    const locale = 'es-ES';
+    const result = getIntevalFromNowFormatted(futureDate, locale);
+    expect(result).toBe('dentro de 1 día');
+  });
+
+  it('should throw for invalid date', () => {
+    const invalidDate = new Date('invalid-date');
+    const locale = 'en-US';
+    expect(() => getIntevalFromNowFormatted(invalidDate, locale)).toThrowError(
+      INTERVAL_DATE_ERR
+    );
+  });
+});

src/ts/get-interval-from-now-formatted/index.ts

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+export const INTERVAL_DATE_ERR =
+  'Invalid date provided. Please provide a valid Date object.';
+
+/**
+ * Formats the time interval between the given date and the current date
+ * into a human-readable relative time string.
+ */
+export default function getIntervalFromNowFormatted(
+  date: Date,
+  locale: Intl.LocalesArgument
+): string {
+  if (!(date instanceof Date) || isNaN(date.getTime())) {
+    throw new TypeError(INTERVAL_DATE_ERR);
+  }
+
+  const now = new Date();
+  const diffMs = date.getTime() - now.getTime();
+
+  const rtf = new Intl.RelativeTimeFormat(locale, { numeric: 'always' });
+
+  const seconds = diffMs / 1000;
+  const minutes = seconds / 60;
+  const hours = minutes / 60;
+  const days = hours / 24;
+
+  if (Math.abs(days) >= 1) {
+    return rtf.format(Math.round(days), 'day');
+  }
+
+  if (Math.abs(hours) >= 1) {
+    return rtf.format(Math.round(hours), 'hour');
+  }
+
+  if (Math.abs(minutes) >= 1) {
+    return rtf.format(Math.round(minutes), 'minute');
+  }
+
+  return rtf.format(Math.round(seconds), 'second');
+}