/**
 * Returns a string similar to `Date.toISOString()` but in the
 * timezone `tzid`. Contrary to the typical meaning of `Z` at the end
 * of the string, this is not actually a UTC date.
 */
export declare function getPseudoISO(tzid: string, date: Date): string;
/**
 * Returns number of minutes `tzid` is offset from UTC on date `date`.
 */
export declare function getTimezoneOffset(tzid: string, date: Date): number;
/**
 * Returns YYYY-MM-DD in the local timezone
 */
export declare function isoDateString(dt: Date): string;