/**
 * Validates if a given legacy time string has at least 6 numeric characters for I12 format.
 *
 * The I12 format is expected to be 6 numeric characters (HHMMSS).
 * This validation is permissive and will accept strings with more than 6 digits,
 * extracting the first 6 for parsing.
 *
 * @param {string} value - The legacy time string to validate.
 * @returns {boolean} `true` if the string has at least 6 digits, otherwise `false`.
 */
export declare function isValidI12(value: string): boolean;
/**
 * Validates if a given legacy time string has at least 4 numeric characters for I11 format.
 *
 * The I11 format is expected to be 4 numeric characters (HHMM).
 * This validation is permissive and will accept strings with more than 4 digits,
 * extracting the first 4 for parsing.
 *
 * @param {string} value - The legacy time string to validate.
 * @returns {boolean} `true` if the string has at least 4 digits, otherwise `false`.
 */
export declare function isValidI11(value: string): boolean;
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