/**
 * Formats a date value into a string representation based on the specified options.
 *
 * @param dateInput - The input value representing a date. It can be a string, number (timestamp), or a Date instance.
 * @param includeTime - (Optional) A boolean value indicating whether to include the time component in the formatted string. It can also be set to 'SECONDS' to include seconds.
 * @param dateFormat - (Optional) The format string to use for formatting the date. If not provided, a default format is used based on the `includeTime` option.
 * @returns A formatted string representation of the date, or an empty string if the input is invalid or cannot be formatted.
 *
 * @remarks
 * If `includeTime` is not provided or set to `false`, only the date component is included in the formatted string.
 * If `includeTime` is set to `true`, the formatted string includes the date and time components.
 * If `includeTime` is set to `'SECONDS'`, the formatted string includes the date, time, and seconds components.
 *
 * The `dateFormat` parameter allows customization of the format string used for formatting the date. If not provided, a default format is used based on the `includeTime` option.
 *
 * The function supports three types of inputs: string, number (timestamp), and Date instance.
 *
 * - For a string input, if it is a valid number, it is parsed as a timestamp. Otherwise, it is treated as a date string.
 * - For a number input, it is treated as a timestamp.
 * - For a Date instance input, it is used as is.
 *
 * The function uses the `createDateWithoutTimezoneOffset` function to handle timezone offsets and ensure consistent formatting.
 *
 * @example
 * // Format date without time
 * const result = formatDate('2021-06-09');
 * // Returns: 'June 9, 2021'
 *
 * @example
 * // Format date with time
 * const result = formatDate('2021-06-09', true);
 * // Returns: 'June 9, 2021 00:00 AM'
 *
 * @example
 * // Format date with time including seconds
 * const result = formatDate('2021-06-09', 'SECONDS');
 * // Returns: 'June 9, 2021 00:00:00 AM'
 *
 * @example
 * // Format date using custom format
 * const result = formatDate('2021-06-09', true, 'MM/dd/yyyy HH:mm');
 * // Returns: '06/09/2021 00:00'
 */
export declare const formatDate: (dateInput: string | number | Date, includeTime?: boolean | 'SECONDS', dateFormat?: string) => string;
/**
 * Checks if a string is in ISO 8601 date format.
 *
 * @param str - The string to be checked.
 * @returns A boolean indicating whether the string is in ISO 8601 date format.
 *
 * @remarks
 * The function verifies if the provided string matches the pattern `YYYY-MM-DDTHH:mm:ss.SSSZ`, which is the standard format defined by ISO 8601 for representing dates and times.
 * The function further validates if the string can be successfully parsed into a valid Date object and then converted back to the original string representation using the `toISOString` method.
 *
 * @example
 * const result = isIsoDate('2021-06-09T12:34:56.789Z');
 * // Returns: true
 *
 * @example
 * const result = isIsoDate('2021-06-09T12:34:56');
 * // Returns: false
 */
export declare const isIsoDate: (str: string) => boolean;
/**
 * Creates a new Date instance with the timezone offset applied or removed, based on the input.
 *
 * @param dateInput - The input value representing a date. It can be a string, number (timestamp), or a Date instance.
 * @returns A new Date instance with the timezone offset adjusted or removed.
 *
 * @remarks
 * If the `dateInput` is a number or a Date instance, the function returns a new Date instance without applying any timezone offset.
 *
 * If the `dateInput` is a string without a time component (e.g., '2021-06-09'), the function returns a new Date instance with the timezone offset adjustment based on the local time zone.
 *
 * If the `dateInput` is a string with a time component (e.g., '2021-06-09T12:34:56Z'), the function returns the original Date instance without applying any timezone offset.
 *
 * @example
 * // Number input
 * const result = createDateWithoutTimezoneOffset(1623247200000);
 * // Returns: A new Date instance equivalent to June 9, 2021 00:00:00 UTC
 *
 * @example
 * // Date input
 * const input = new Date('2021-06-09T00:00:00Z');
 * const result = createDateWithoutTimezoneOffset(input);
 * // Returns: A new Date instance equivalent to the input date without timezone offset
 *
 * @example
 * // String input without time
 * const result = createDateWithoutTimezoneOffset('2021-06-09');
 * // Returns: A new Date instance with the timezone offset adjustment based on the local time zone
 *
 * @example
 * // String input with time
 * const result = createDateWithoutTimezoneOffset('2021-06-09T12:34:56Z');
 * // Returns: The original Date instance without applying any timezone offset
 */
export declare const createDateWithoutTimezoneOffset: (dateInput: string | number | Date) => Date;
/**
 * Checks if a given date string contains a time component.
 *
 * @param {string} dateString - The date string to be checked.
 * @returns {boolean} - Returns true if the date string contains a time component, otherwise returns false.
 */
export declare const dateStringHasTimeComponent: (dateString: string) => boolean;