BUG: options `date_dayfirst` and `date_yearfirst` conflict
Can someone confirm that this is a bug:

```
pd.options.display.chop_threshold = 0.5
pd.options.display.date_dayfirst = True
df = pd.DataFrame([[1.00, 0.1, 0.01, 0.001], [2.22, 2.22, 2.22, 2.22]], 
                  index=pd.date_range(start="01-01-2000", periods=2))
print(df)
               0     1     2     3
2000-01-01  1.00  0.00  0.00  0.00
2000-01-02  2.22  2.22  2.22  2.22
```

Also it seems weird to have the options `display.date_dayfirst` and `display.date_yearfirst` with both set to `False` by default, and yet print year first.. 

Docs say: `When True, prints and parses dates with the day first, eg 20/01/2005`. Maybe this is just for parsing?