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import type { Interval } from 'date-fns';
import { DurationFormat } from '@formatjs/intl-durationformat';
import { intervalToDuration, isValid, parse } from 'date-fns';
export const SANE_ISO_DATE_FORMATS = [
'yyyy-MM-dd',
"yyyy-MM-dd'T'HH:mm:ss",
"yyyy-MM-dd'T'HH:mm:ss.SSS",
"yyyy-MM-dd'T'HH:mm:ssXXX",
"yyyy-MM-dd'T'HH:mm:ss.SSSXXX",
] as const;
/**
* Returns a parsed date or undefined if a parse error occurs or the date is invalid
* @param maybeDatestring a date string in the following formats:
* - YYYY-MM-DD
* - YYYY-MM-DDTHH:mm:ss
* - YYYY-MM-DDTHH:mm:ssZ
* - YYYY-MM-DDTHH:mm:ss±HH:mm
*
* We don't accept any other [valid, but insane ISO datestring](https://bsky.app/profile/gwen.works/post/3ljvdiur2lc2s)
*/
export function parseISOSafe(maybeDatestring: string) {
return tryParseDate(maybeDatestring, ...SANE_ISO_DATE_FORMATS);
}
if (import.meta.vitest) {
const { test, expect, describe } = import.meta.vitest;
describe('parseISOSafe', () => {
test('works on sane ISO 8601 datestrings', () => {
expect(parseISOSafe('2023-10-01')).toBeInstanceOf(Date);
expect(parseISOSafe('2023-10-01T12:00:00')).toBeInstanceOf(Date);
expect(parseISOSafe('2023-10-01T12:00:00Z')).toBeInstanceOf(Date);
expect(parseISOSafe('2023-10-01T12:00:00+02:00')).toBeInstanceOf(Date);
expect(parseISOSafe('2025-04-25T12:38:36.000Z')).toBeInstanceOf(Date);
});
test('does not parse "61"', () => {
// Crazy right??
expect(parseISOSafe('61')).toBeUndefined();
});
});
}
/**
* Returns a parsed date or undefined if a parse error occurs or the date is invalid,
* trying the given formats in order
*/
export function tryParseDate(maybeDatestring: string, ...formats: string[]): Date | undefined {
for (const format of formats) {
try {
const date = parse(maybeDatestring, format, new Date());
if (isValid(date)) return date;
} catch {
continue;
}
}
return undefined;
}
if (import.meta.vitest) {
const { test, expect, describe } = import.meta.vitest;
describe('tryParse', () => {
test('works on valid datestrings', () => {
expect(tryParseDate('2023-10-01', 'yyyy-MM-dd')).toBeInstanceOf(Date);
expect(tryParseDate('2023-10-01T12:00:00', "yyyy-MM-dd'T'HH:mm:ss")).toBeInstanceOf(
Date
);
expect(tryParseDate('2023-10-01T12:00:00Z', "yyyy-MM-dd'T'HH:mm:ssXXX")).toBeInstanceOf(
Date
);
});
test('returns undefined for Invalid Date datestrings', () => {
expect(tryParseDate('2019-05-09T08:25:22+0000')).toBeUndefined();
});
test('returns undefined for malformed datestrings', () => {
expect(tryParseDate('2023_10-01', 'yyyy-MM-dd')).toBeUndefined();
expect(tryParseDate('chicken jockey')).toBeUndefined();
});
});
}
/**
* Formats a duration, in a stopwatch / scoreboard format (XX:XX'XX")
*/
export function formatDurationStopwatch(durationMs: number): `${number}:${number}'${number}"` {
const { hours, minutes, seconds } = intervalToDuration({
start: Date.now(),
end: Date.now() + durationMs,
});
const [h, m, s] = [hours, minutes, seconds].map(
(val) => (val ?? 0).toString().padStart(2, '0') as `${number}`
);
return `${h}:${m}'${s}"` as const;
}
export function formatDurationShort(locale: string, durationMs: number) {
return formatDistanceToNowShortParts(locale, {
start: 0,
end: durationMs,
}).join('');
}
/**
* Formats a date as a distance to now, but in a short format (e.g. "5m" instead of "5 minutes ago")
* Uses Intl.DurationFormat#formatToParts under the hood
* @returns array of non-whitespace-only parts. In practice, this is a alternating array of numbers and unit strings, in descending order of magnitude (e.g. ["1", "d", "5", "hr"] for "1 day and 5 hours ago"). Useful if you have not much space and wanna cut it to e.g. only "1d" instead of "1d 5hr".
*/
export function formatDistanceToNowShortParts(
locale: string,
date: Interval | Date | number
): string[] {
return new DurationFormat(locale, { style: 'narrow' })
.formatToParts(
intervalToDuration(
date instanceof Date || typeof date === 'number'
? {
start: Date.now(),
end: date,
}
: date
)
)
.map((part) => part.value)
.filter((value) => value.trim());
}
if (import.meta.vitest) {
const { test, expect, describe, vi } = import.meta.vitest;
describe('formatDistanceToNowShortParts', () => {
test('formats distance to now in short parts', () => {
const now = Date.now();
vi.useFakeTimers().setSystemTime(now);
expect(
formatDistanceToNowShortParts('en-US', new Date(now - 1000 * 60 * 60 * 24))
).toEqual(['-', '1', 'd']);
expect(formatDistanceToNowShortParts('en-US', new Date(now + 1000 * 60 * 5))).toEqual([
'5',
'm',
]);
expect(
formatDistanceToNowShortParts('en-US', new Date(now + 1000 * 60 * 60 * 26))
).toEqual(['1', 'd', '2', 'h']);
});
});
}
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