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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 start of the quarter for a given ISO datetime. * * - Returns the first day of the quarter with time set to 00:00:00. * - Q1 returns "01-01T00:00:00", Q2 returns "04-01T00:00:00", etc. * - Validates input using isValidDateTime. * * @param value ISO PlainDateTime string * @returns ISO PlainDateTime string for the start of the quarter, or "" on invalid input * * @example startOfQuarterForDateTime("2024-03-15T12:00:00") // "2024-01-01T00:00:00" * @example startOfQuarterForDateTime("2024-06-15T12:00:00") // "2024-04-01T00:00:00" * @example startOfQuarterForDateTime("invalid") // "" */ export declare function startOfQuarterForDateTime(value: string): string;