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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 first day of the quarter for a given ISO date. * * - Returns the first day (month and day set to 1) of the quarter containing the input date. * - Q1 returns "01-01", Q2 returns "04-01", Q3 returns "07-01", Q4 returns "10-01". * - Validates input using isValidDate. * * @param value ISO PlainDate string * @returns ISO PlainDate string for the first day of the quarter, or "" on invalid input * * @example startOfQuarterForDate("2024-03-15") // "2024-01-01" * @example startOfQuarterForDate("2024-06-15") // "2024-04-01" * @example startOfQuarterForDate("2024-09-15") // "2024-07-01" * @example startOfQuarterForDate("2024-12-15") // "2024-10-01" * @example startOfQuarterForDate("invalid") // "" */ export declare function startOfQuarterForDate(value: string): string;