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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 the ordinal day-of-year (1-based) for `value`. * * - Jan 1 is 1; Dec 31 is 365 (common year) or 366 (leap year). * - Returns null on invalid input. * * @param value ISO PlainDate string * @returns 1-366, or null on invalid input * * @example getDayOfYear("2024-01-01") // 1 * @example getDayOfYear("2024-12-31") // 366 (leap year) * @example getDayOfYear("2023-12-31") // 365 * @example getDayOfYear("2024-03-01") // 61 (after the Feb 29 leap day) * @example getDayOfYear("invalid") // null */ export declare function getDayOfYear(value: string): number | null;