@technobuddha/library/src/parse-date.test.ts

A large library of useful functions

import { parseDate } from './parse-date.ts';

describe('parseDate', () => {
  test('should parse mdy (num)', () => {
    expect(parseDate('06012021').toString()).toBe(new Date('1 Jun 2021').toString());
  });

  test('should parse ymd (num)', () => {
    expect(parseDate('20210601').toString()).toBe(new Date('1 Jun 2021').toString());
  });

  test('should parse mdy (str)', () => {
    expect(parseDate('Jun012021').toString()).toBe(new Date('1 Jun 2021').toString());
  });

  test('should parse dmy (str)', () => {
    expect(parseDate('01Jun2021').toString()).toBe(new Date('1 Jun 2021').toString());
  });

  test('should parse ymd (str)', () => {
    expect(parseDate('2021Jun01').toString()).toBe(new Date('1 Jun 2021').toString());
  });

  test('should parse ydm (str)', () => {
    expect(parseDate('202101Jun').toString()).toBe(new Date('1 Jun 2021').toString());
  });

  test('should parse m (num)', () => {
    expect(parseDate('06').toString()).toBe(new Date('1 Jun 1000').toString());
  });

  test('should parse m (str)', () => {
    expect(parseDate('Jun').toString()).toBe(new Date('1 Jun 1000').toString());
  });

  test('should parse my (num)', () => {
    expect(parseDate('062021').toString()).toBe(new Date('1 Jun 2021').toString());
  });

  test('should parse ym (num)', () => {
    expect(parseDate('202106').toString()).toBe(new Date('1 Jun 2021').toString());
  });

  test('should parse my (str)', () => {
    expect(parseDate('Jun2021').toString()).toBe(new Date('1 Jun 2021').toString());
  });

  test('should parse ym (str)', () => {
    expect(parseDate('2021Jun').toString()).toBe(new Date('1 Jun 2021').toString());
  });

  test('should parse y (num)', () => {
    expect(parseDate('2021').toString()).toBe(new Date('1 Jan 2021').toString());
  });

  test('should fall back to Date parsing', () => {
    const now = new Date().toString();
    expect(parseDate(now).toString()).toBe(now);
  });

  test('should allow times on some formats', () => {
    expect(parseDate('06012021T01:02:03.456').toString()).toBe(
      new Date('1 Jun 2021 01:02:03.456').toString(),
    );
  });

  test('should allow am/pm on times', () => {
    expect(parseDate('06012021T12:02:03.456am').toString()).toBe(
      new Date('1 Jun 2021 00:02:03.456').toString(),
    );
    expect(parseDate('06012021T01:02:03.456pm').toString()).toBe(
      new Date('1 Jun 2021 13:02:03.456').toString(),
    );
  });

  test('should allow timezone', () => {
    expect(parseDate('06012021T01:02Z').toUTCString()).toBe(
      new Date('2021-06-01T01:02Z').toUTCString(),
    );
    expect(parseDate('06012021T01:02GMT-01').toUTCString()).toBe(
      new Date('2021-06-01T02:02Z').toUTCString(),
    );
    expect(parseDate('06012021T01:02GMT-01:30').toUTCString()).toBe(
      new Date('2021-06-01T01:32Z').toUTCString(),
    );
    expect(parseDate('06012021T01:02GMT-10').toUTCString()).toBe(
      new Date('2021-06-01T11:02Z').toUTCString(),
    );
  });
});