## Bug description

*Please describe.*  
*If this affects the front-end, screenshots would be of great help.*  

funnels -> select two steps for the funnel -> historical view

This is because we're not passing in a year to dayjs so it defaults to 2001

<img width="592" alt="Screen Shot 2021-07-14 at 1 39 47 PM" src="https://user-images.githubusercontent.com/25164963/125667575-5f8c2450-5998-4602-8a36-f886c1c786c5.png">


## Expected behavior



## How to reproduce

1.
2.
3.

## Environment

- [ ] PostHog Cloud
- [ ] self-hosted PostHog, version/commit: _please provide_

## Additional context



#### *Thank you* for your bug report – we love squashing them!

ee/clickhouse/queries/funnels/funnel_trends.py
count = len(summary)
        data = []
        days = []
        labels = []
        for row in summary:
            data.append(row["conversion_rate"])
            days.append(row["timestamp"].strftime(HUMAN_READABLE_TIMESTAMP_FORMAT))
            labels.append(row["timestamp"].strftime(HUMAN_READABLE_TIMESTAMP_FORMAT))
        return [{"count": count, "data": data, "days": days, "labels": labels,}]
    def _is_period_final(self, timestamp: Union[datetime, date]):
        # di
        now = datetime.utcnow().date()
        days_to_subtract = self._filter.funnel_window_days * -1
        delta = timedelta(days=days_to_subtract)
        completed_end = now + delta
        compare_timestamp = timestamp.date() if isinstance(timestamp, datetime) else timestamp
        is_final = compare_timestamp <= completed_end
        return is_final