export type PlainDateUnit = 'day' | 'days' | 'week' | 'weeks' | 'month' | 'months' | 'year' | 'years';
export type ReachablePlainDateUnit = 'week' | 'month' | 'year' | 'isoWeek';
export type GetPlainDateUnit = 'day of month' | 'day' | 'week of month' | 'week' | 'month' | 'year';
export type DiffPlainDateUnit = 'days' | 'weeks' | 'months' | 'quarters' | 'years';