proc `+`(self: datetime; delta: timedelta): datetime {....raises: [], tags: [],
    forbids: [].}

proc `-`(self: datetime; delta: timedelta): datetime {....raises: [], tags: [],
    forbids: [].}

proc `-`(self: datetime; dt: datetime): timedelta {.
    ...raises: [NotImplementedError, ValueError, TypeError], tags: [], forbids: [].}

proc `<`(self: datetime; dt: datetime): bool {.
    ...raises: [NotImplementedError, ValueError, TypeError], tags: [], forbids: [].}

proc `<=`(self: datetime; dt: datetime): bool {.
    ...raises: [NotImplementedError, ValueError, TypeError], tags: [], forbids: [].}

proc `==`(self: datetime; dt: datetime): bool {.
    ...raises: [NotImplementedError, ValueError, TypeError], tags: [], forbids: [].}