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@burglekitt/gmt

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Temporal-based date and time utilities with timezone support and polyfill integration

github.com/burglekitt/gmt

burglekitt/gmt

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/** * Return true if `start` and `end` form a valid date interval — both parseable as * ISO PlainDate strings and `start <= end`. * * - Both inputs must be ISO 8601 date strings (e.g. `"2024-01-01"`). * - Equal `start === end` is valid. * - Invalid input, malformed strings, or leap-second strings return `false`. * - Accepts GMT calendar-annotated PlainDate strings — E5 (issue #78). Ordering is * calendar-independent, so `start`/`end` may carry different or no calendar tags (D4). * * @param start ISO 8601 date string (interval start), optionally calendar-annotated * @param end ISO 8601 date string (interval end), optionally calendar-annotated * @returns true if start and end form a valid date interval, or false on invalid input * * @example isValidDateInterval("2024-01-01", "2024-12-31") // true * @example isValidDateInterval("2024-01-01", "2024-01-01") // true * @example isValidDateInterval("2024-12-31", "2024-01-01") // false * @example isValidDateInterval("invalid", "2024-12-31") // false * @example isValidDateInterval("5785-01-01[u-ca=hebrew]", "2024-12-31") // true (mixed calendars — ordering is calendar-independent) */ export declare function isValidDateInterval(start: string, end: string): boolean;