/**
 * Formats `date` to a format that is compatible with `input[type=datetime-local]`.
 * The input type is finicky in only accepting very specifically formatted time
 * strings which don't actually accept a timezone to make them local. So, this
 * function takes care of converting to the proper timezone to ensure that the
 * date that the input shows matches exactly what is supplied.
 *
 * `tzOffset` is expected to be a timezone offset represented in minutes, such as
 * `240` for Eastern Time (US).
 */
export declare function formatDateTimeLocalToString(date: undefined, tzOffset?: number): undefined;
export declare function formatDateTimeLocalToString(date: Date, tzOffset?: number): string;
export declare function formatDateTimeLocalToString(date?: Date, tzOffset?: number): string | undefined;
/**
 * The inverse of `formatDateTimeLocalToString`, this function takes a date
 * string from the value of an `input[type=datetime-local]` and parses it into
 * a `Date` object, with the appropriate timezone translations applied so that
 * the time the user picks in the input visually matches the Date that is returned.
 *
 * Without this, timezone conversions would provide a UTC Date object from a
 * localized date selection, which always ends up appearing incorrect.
 */
export declare function parseStringToDateTimeLocal(source: string, tzOffset?: number): Date;
/**
 * Take the given `date` and strip the timezone information, treating it as
 * a UTC time directly (without adding or subtracting the timezone offset).
 */
export declare function forceDateAsUTC(date?: Date): Date | undefined;
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