Add DateTime value object with comprehensive unit tests
- Implemented DateTime class for handling ISO date-time parsing, formatting, and validation. - Added InvalidDateTimeError for error handling in date-time operations. - Created extensive unit tests covering various scenarios for date-time creation, parsing, and formatting, ensuring robust functionality and error handling. - Included tests for timezone handling, invalid inputs, and edge cases to validate the DateTime implementation.
This commit is contained in:
shancheas
@@ -0,0 +1,302 @@
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import { DateTime } from './date-time';
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import { InvalidDateTimeError } from './invalid-date-time.error';
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describe('DateTime', () => {
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const originalTimezone = process.env.DEFAULT_TIMEZONE;
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afterEach(() => {
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if (originalTimezone === undefined) {
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delete process.env.DEFAULT_TIMEZONE;
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} else {
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process.env.DEFAULT_TIMEZONE = originalTimezone;
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}
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});
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describe('create', () => {
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it('parses ISO with +07:00 offset into UTC unix milliseconds', () => {
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const dt = DateTime.create('2026-08-20T17:00:00+07:00');
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expect(dt.value).toBe(Date.UTC(2026, 7, 20, 10, 0, 0, 0));
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});
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it('parses ISO with Z into the same instant as an equivalent offset', () => {
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const withOffset = DateTime.create('2026-08-20T17:00:00+07:00');
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const withZ = DateTime.create('2026-08-20T10:00:00.000Z');
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expect(withZ.value).toBe(withOffset.value);
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expect(withZ.value).toBe(Date.UTC(2026, 7, 20, 10, 0, 0, 0));
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});
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it('parses compact offset without colon', () => {
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const dt = DateTime.create('2026-08-20T17:00:00.123+0700');
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expect(dt.value).toBe(Date.UTC(2026, 7, 20, 10, 0, 0, 123));
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});
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it('parses hour-only ISO offset', () => {
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const dt = DateTime.create('2026-08-20T17:00:00+07');
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expect(dt.value).toBe(Date.UTC(2026, 7, 20, 10, 0, 0, 0));
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});
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it('accepts lowercase z designator', () => {
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const dt = DateTime.create('2026-08-20T10:00:00z');
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expect(dt.value).toBe(Date.UTC(2026, 7, 20, 10, 0, 0, 0));
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});
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it('truncates fractional seconds beyond milliseconds', () => {
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const dt = DateTime.create('2026-08-20T10:00:00.123456Z');
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expect(dt.value).toBe(Date.UTC(2026, 7, 20, 10, 0, 0, 123));
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});
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it('trims surrounding whitespace', () => {
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const dt = DateTime.create(' 2026-08-20T10:00:00Z ');
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expect(dt.value).toBe(Date.UTC(2026, 7, 20, 10, 0, 0, 0));
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});
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it('interprets naive ISO as wall clock in DEFAULT_TIMEZONE (GMT+7)', () => {
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delete process.env.DEFAULT_TIMEZONE;
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const dt = DateTime.create('2026-08-20T17:00:00');
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expect(dt.value).toBe(Date.UTC(2026, 7, 20, 10, 0, 0, 0));
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});
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it('interprets naive ISO with fractional seconds using env timezone', () => {
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process.env.DEFAULT_TIMEZONE = 'GMT+7';
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const dt = DateTime.create('2026-08-20T17:00:00.500');
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expect(dt.value).toBe(Date.UTC(2026, 7, 20, 10, 0, 0, 500));
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});
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it('uses a custom DEFAULT_TIMEZONE for naive ISO parse', () => {
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process.env.DEFAULT_TIMEZONE = 'UTC+0';
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const dt = DateTime.create('2026-08-20T17:00:00');
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expect(dt.value).toBe(Date.UTC(2026, 7, 20, 17, 0, 0, 0));
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});
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it('does not change value of offset-aware instant when DEFAULT_TIMEZONE changes', () => {
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process.env.DEFAULT_TIMEZONE = 'GMT+7';
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const dt = DateTime.create('2026-08-20T10:00:00Z');
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const valueBefore = dt.value;
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process.env.DEFAULT_TIMEZONE = 'UTC-5';
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expect(dt.value).toBe(valueBefore);
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expect(dt.value).toBe(Date.UTC(2026, 7, 20, 10, 0, 0, 0));
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});
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it('rejects date-only strings', () => {
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expect(() => DateTime.create('2026-08-20')).toThrow(InvalidDateTimeError);
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});
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it('rejects empty string', () => {
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expect(() => DateTime.create('')).toThrow(InvalidDateTimeError);
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});
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it('rejects whitespace-only input', () => {
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expect(() => DateTime.create(' ')).toThrow(InvalidDateTimeError);
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});
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it('rejects non-string input', () => {
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expect(() => DateTime.create(null as unknown as string)).toThrow(
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InvalidDateTimeError,
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);
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expect(() => DateTime.create(123 as unknown as string)).toThrow(
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InvalidDateTimeError,
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);
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});
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it('rejects junk', () => {
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expect(() => DateTime.create('not-a-date')).toThrow(InvalidDateTimeError);
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});
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it('rejects overflow calendar dates', () => {
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expect(() => DateTime.create('2026-02-30T10:00:00Z')).toThrow(
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InvalidDateTimeError,
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);
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});
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it('rejects out-of-range ISO offsets', () => {
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expect(() => DateTime.create('2026-08-20T10:00:00+15:00')).toThrow(
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InvalidDateTimeError,
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);
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expect(() => DateTime.create('2026-08-20T10:00:00+14:30')).toThrow(
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InvalidDateTimeError,
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);
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expect(() => DateTime.create('2026-08-20T10:00:00-12:30')).toThrow(
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InvalidDateTimeError,
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);
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});
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it('rejects invalid DEFAULT_TIMEZONE when parsing naive ISO', () => {
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process.env.DEFAULT_TIMEZONE = 'Asia/Jakarta';
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expect(() => DateTime.create('2026-08-20T17:00:00')).toThrow(
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InvalidDateTimeError,
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);
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});
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it('throws a generic message that does not echo the input', () => {
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expect(() => DateTime.create('not-a-date')).toThrow('Invalid date time');
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});
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});
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describe('fromUnixMs', () => {
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it('reconstructs from a unix millisecond timestamp', () => {
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const ms = Date.UTC(2026, 7, 20, 10, 0, 0, 0);
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const dt = DateTime.fromUnixMs(ms);
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expect(dt.value).toBe(ms);
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});
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it('round-trips with create', () => {
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const created = DateTime.create('2026-08-20T17:00:00+07:00');
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const restored = DateTime.fromUnixMs(created.value);
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expect(restored.equals(created)).toBe(true);
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});
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it('rejects non-finite numbers', () => {
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expect(() => DateTime.fromUnixMs(Number.NaN)).toThrow(
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InvalidDateTimeError,
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);
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expect(() => DateTime.fromUnixMs(Number.POSITIVE_INFINITY)).toThrow(
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InvalidDateTimeError,
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);
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});
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it('rejects non-safe integers', () => {
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expect(() => DateTime.fromUnixMs(1.5)).toThrow(InvalidDateTimeError);
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expect(() => DateTime.fromUnixMs(Number.MAX_SAFE_INTEGER + 2)).toThrow(
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InvalidDateTimeError,
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);
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});
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it('rejects values outside the Date time-value range', () => {
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expect(() => DateTime.fromUnixMs(8_640_000_000_000_001)).toThrow(
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InvalidDateTimeError,
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);
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expect(() => DateTime.fromUnixMs(-8_640_000_000_000_001)).toThrow(
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InvalidDateTimeError,
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);
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});
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it('accepts pre-1970 negative timestamps', () => {
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const ms = Date.UTC(1969, 11, 31, 23, 59, 59, 0);
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const dt = DateTime.fromUnixMs(ms);
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expect(dt.value).toBe(ms);
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expect(dt.format('UTC')).toBe('1969-12-31T23:59:59.000+00:00');
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});
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it('rejects non-number input', () => {
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expect(() =>
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DateTime.fromUnixMs('1724150000000' as unknown as number),
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).toThrow(InvalidDateTimeError);
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});
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});
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describe('format / toString', () => {
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it('formats in DEFAULT_TIMEZONE (GMT+7) by default', () => {
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delete process.env.DEFAULT_TIMEZONE;
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const dt = DateTime.fromUnixMs(Date.UTC(2026, 7, 20, 10, 0, 0, 0));
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expect(dt.format()).toBe('2026-08-20T17:00:00.000+07:00');
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expect(dt.toString()).toBe('2026-08-20T17:00:00.000+07:00');
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});
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it('formats in an explicit timezone override', () => {
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const dt = DateTime.fromUnixMs(Date.UTC(2026, 7, 20, 10, 0, 0, 0));
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expect(dt.format('UTC')).toBe('2026-08-20T10:00:00.000+00:00');
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expect(dt.format('Z')).toBe('2026-08-20T10:00:00.000+00:00');
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expect(dt.format('+00:00')).toBe('2026-08-20T10:00:00.000+00:00');
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});
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it('changes render output when DEFAULT_TIMEZONE changes', () => {
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const dt = DateTime.fromUnixMs(Date.UTC(2026, 7, 20, 10, 0, 0, 0));
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process.env.DEFAULT_TIMEZONE = 'GMT+7';
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expect(dt.format()).toBe('2026-08-20T17:00:00.000+07:00');
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process.env.DEFAULT_TIMEZONE = 'UTC-5';
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expect(dt.format()).toBe('2026-08-20T05:00:00.000-05:00');
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});
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it('rejects invalid timezone override', () => {
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const dt = DateTime.fromUnixMs(Date.UTC(2026, 7, 20, 10, 0, 0, 0));
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expect(() => dt.format('Asia/Jakarta')).toThrow(InvalidDateTimeError);
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});
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it('rejects out-of-range timezone override', () => {
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const dt = DateTime.fromUnixMs(Date.UTC(2026, 7, 20, 10, 0, 0, 0));
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expect(() => dt.format('+15:00')).toThrow(InvalidDateTimeError);
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expect(() => dt.format('GMT-13')).toThrow(InvalidDateTimeError);
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});
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it('rejects formatting when offset shift overflows Date range', () => {
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const dt = DateTime.fromUnixMs(8_640_000_000_000_000);
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expect(() => dt.format('GMT+7')).toThrow(InvalidDateTimeError);
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});
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});
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describe('equals', () => {
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it('returns true for the same instant from different inputs', () => {
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const a = DateTime.create('2026-08-20T17:00:00+07:00');
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const b = DateTime.create('2026-08-20T10:00:00Z');
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expect(a.equals(b)).toBe(true);
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});
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it('returns false for different instants', () => {
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const a = DateTime.create('2026-08-20T10:00:00Z');
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const b = DateTime.create('2026-08-20T11:00:00Z');
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expect(a.equals(b)).toBe(false);
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});
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it('returns false for null or undefined', () => {
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const dt = DateTime.create('2026-08-20T10:00:00Z');
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expect(dt.equals(null as unknown as DateTime)).toBe(false);
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expect(dt.equals(undefined as unknown as DateTime)).toBe(false);
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});
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});
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describe('serialization', () => {
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it('toJSON returns unix milliseconds', () => {
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const ms = Date.UTC(2026, 7, 20, 10, 0, 0, 0);
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const dt = DateTime.fromUnixMs(ms);
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expect(dt.toJSON()).toBe(ms);
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expect(JSON.stringify({ at: dt })).toBe(`{"at":${ms}}`);
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});
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});
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describe('immutability', () => {
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it('is frozen after creation', () => {
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const dt = DateTime.create('2026-08-20T10:00:00Z');
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expect(Object.isFrozen(dt)).toBe(true);
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});
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it('cannot be constructed with new from outside', () => {
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expect(
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() =>
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new (DateTime as unknown as new (value: number) => DateTime)(
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Date.UTC(2026, 7, 20, 10, 0, 0, 0),
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),
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).toThrow();
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});
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});
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});
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@@ -0,0 +1,227 @@
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import { InvalidDateTimeError } from './invalid-date-time.error';
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const DEFAULT_TZ_FALLBACK = 'GMT+7';
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/** ECMAScript Date time value limits (±100_000_000 days from epoch). */
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const MAX_UNIX_MS = 8_640_000_000_000_000;
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/** ISO datetime with optional fractional seconds and optional Z / offset. */
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const ISO_DATETIME =
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/^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(?:\.(\d{1,9}))?(?:(Z)|([+-])(\d{2})(?::?(\d{2}))?)?$/i;
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/** Fixed offset forms: GMT+7, UTC+07:00, +7, +07:00, +0700, Z, UTC */
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const TZ_OFFSET =
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/^(?:(?:GMT|UTC)\s*)?([+-])(\d{1,2})(?::?(\d{2}))?$|^(?:Z|UTC|GMT)$/i;
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function pad2(n: number): string {
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return n.toString().padStart(2, '0');
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}
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function pad3(n: number): string {
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return n.toString().padStart(3, '0');
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}
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function parseFractionalMs(raw: string | undefined): number {
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if (raw === undefined) {
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return 0;
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}
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// Truncate beyond millisecond precision (do not round — avoids second carry).
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return Number.parseInt(raw.slice(0, 3).padEnd(3, '0'), 10);
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}
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function assertValidOffset(hours: number, minutes: number, sign: number): void {
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if (minutes > 59) {
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throw new InvalidDateTimeError();
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}
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// Real fixed-offset range is -12:00 to +14:00.
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const total = sign * (hours * 60 + minutes);
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if (total < -12 * 60 || total > 14 * 60) {
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throw new InvalidDateTimeError();
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}
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}
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/**
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* Parses a fixed-offset timezone string into minutes east of UTC.
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* Accepts: GMT+7, GMT+07:00, UTC+7, +07:00, +7, +0700, Z, UTC, GMT (and negatives).
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*/
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export function parseTimezoneOffsetMinutes(raw: string): number {
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const trimmed = raw.trim();
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const match = TZ_OFFSET.exec(trimmed);
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if (!match) {
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throw new InvalidDateTimeError();
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}
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// Z / UTC / GMT alone leave the sign capture unset.
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if (match[1] === undefined) {
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return 0;
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}
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const sign = match[1] === '-' ? -1 : 1;
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const hours = Number.parseInt(match[2], 10);
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const minutes = match[3] !== undefined ? Number.parseInt(match[3], 10) : 0;
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assertValidOffset(hours, minutes, sign);
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return sign * (hours * 60 + minutes);
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}
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export function resolveDefaultTimezone(): string {
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const fromEnv = process.env.DEFAULT_TIMEZONE;
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if (fromEnv === undefined || fromEnv.trim() === '') {
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return DEFAULT_TZ_FALLBACK;
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}
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return fromEnv.trim();
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}
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function resolveDefaultOffsetMinutes(): number {
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return parseTimezoneOffsetMinutes(resolveDefaultTimezone());
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}
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function formatOffset(offsetMinutes: number): string {
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const sign = offsetMinutes < 0 ? '-' : '+';
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const abs = Math.abs(offsetMinutes);
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const hours = Math.floor(abs / 60);
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const minutes = abs % 60;
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return `${sign}${pad2(hours)}:${pad2(minutes)}`;
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}
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function utcMsFromParts(
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year: number,
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month: number,
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day: number,
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hour: number,
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minute: number,
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second: number,
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ms: number,
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offsetMinutes: number,
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): number {
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const asUtc = Date.UTC(year, month - 1, day, hour, minute, second, ms);
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const d = new Date(asUtc);
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// Reject overflow (e.g. Feb 30) via round-trip on calendar components.
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if (
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d.getUTCFullYear() !== year ||
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d.getUTCMonth() !== month - 1 ||
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d.getUTCDate() !== day ||
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d.getUTCHours() !== hour ||
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d.getUTCMinutes() !== minute ||
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d.getUTCSeconds() !== second ||
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d.getUTCMilliseconds() !== ms
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) {
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throw new InvalidDateTimeError();
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}
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return asUtc - offsetMinutes * 60_000;
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}
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function formatInOffset(utcMs: number, offsetMinutes: number): string {
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const shifted = new Date(utcMs + offsetMinutes * 60_000);
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if (Number.isNaN(shifted.getTime())) {
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throw new InvalidDateTimeError();
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}
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const y = shifted.getUTCFullYear();
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const m = pad2(shifted.getUTCMonth() + 1);
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const d = pad2(shifted.getUTCDate());
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const h = pad2(shifted.getUTCHours());
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const min = pad2(shifted.getUTCMinutes());
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const s = pad2(shifted.getUTCSeconds());
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const ms = pad3(shifted.getUTCMilliseconds());
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return `${y}-${m}-${d}T${h}:${min}:${s}.${ms}${formatOffset(offsetMinutes)}`;
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}
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export class DateTime {
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private static readonly createToken = Symbol('DateTime.create');
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private constructor(
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private readonly unixMs: number,
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token: symbol,
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) {
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if (token !== DateTime.createToken) {
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throw new TypeError(
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'DateTime can only be created via DateTime.create() or DateTime.fromUnixMs()',
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);
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}
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Object.freeze(this);
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}
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static create(raw: string): DateTime {
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if (typeof raw !== 'string') {
|
||||
throw new InvalidDateTimeError();
|
||||
}
|
||||
|
||||
const trimmed = raw.trim();
|
||||
const match = ISO_DATETIME.exec(trimmed);
|
||||
if (!match) {
|
||||
throw new InvalidDateTimeError();
|
||||
}
|
||||
|
||||
const year = Number.parseInt(match[1], 10);
|
||||
const month = Number.parseInt(match[2], 10);
|
||||
const day = Number.parseInt(match[3], 10);
|
||||
const hour = Number.parseInt(match[4], 10);
|
||||
const minute = Number.parseInt(match[5], 10);
|
||||
const second = Number.parseInt(match[6], 10);
|
||||
const ms = parseFractionalMs(match[7]);
|
||||
|
||||
let offsetMinutes: number;
|
||||
if (match[8] !== undefined && match[8].toUpperCase() === 'Z') {
|
||||
offsetMinutes = 0;
|
||||
} else if (match[9] !== undefined) {
|
||||
const sign = match[9] === '-' ? -1 : 1;
|
||||
const oh = Number.parseInt(match[10], 10);
|
||||
const om = match[11] !== undefined ? Number.parseInt(match[11], 10) : 0;
|
||||
assertValidOffset(oh, om, sign);
|
||||
offsetMinutes = sign * (oh * 60 + om);
|
||||
} else {
|
||||
offsetMinutes = resolveDefaultOffsetMinutes();
|
||||
}
|
||||
|
||||
const utcMs = utcMsFromParts(
|
||||
year,
|
||||
month,
|
||||
day,
|
||||
hour,
|
||||
minute,
|
||||
second,
|
||||
ms,
|
||||
offsetMinutes,
|
||||
);
|
||||
|
||||
return new DateTime(utcMs, DateTime.createToken);
|
||||
}
|
||||
|
||||
static fromUnixMs(ms: number): DateTime {
|
||||
if (
|
||||
typeof ms !== 'number' ||
|
||||
!Number.isSafeInteger(ms) ||
|
||||
Math.abs(ms) > MAX_UNIX_MS
|
||||
) {
|
||||
throw new InvalidDateTimeError();
|
||||
}
|
||||
|
||||
return new DateTime(ms, DateTime.createToken);
|
||||
}
|
||||
|
||||
get value(): number {
|
||||
return this.unixMs;
|
||||
}
|
||||
|
||||
equals(other: DateTime): boolean {
|
||||
return other instanceof DateTime && this.unixMs === other.unixMs;
|
||||
}
|
||||
|
||||
format(tz?: string): string {
|
||||
const offsetMinutes =
|
||||
tz === undefined
|
||||
? resolveDefaultOffsetMinutes()
|
||||
: parseTimezoneOffsetMinutes(tz);
|
||||
return formatInOffset(this.unixMs, offsetMinutes);
|
||||
}
|
||||
|
||||
toString(): string {
|
||||
return this.format();
|
||||
}
|
||||
|
||||
toJSON(): number {
|
||||
return this.unixMs;
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,6 @@
|
||||
export class InvalidDateTimeError extends Error {
|
||||
constructor() {
|
||||
super('Invalid date time');
|
||||
this.name = 'InvalidDateTimeError';
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user