Pandas and Date: problem with operator.How to resolve

[snippsat]

The conversion work, but applying "df.where" to filter df["Date"]>"30/11/2014"", the result does not change. Is valid the operator > or i do to use only operator ==?

The code for @Yoriz should work,is that what you have problem with or are doing something else?
Doing myfilter = df["Date"] == "30/11/2014" it will only drop.

Output:
   Conc.	 Date   I   II
2  8928.0  30/11/2014  3.0  15.0

Test of code:

>>> import pandas as pd

>>> df = pd.read_clipboard()
>>> df['Date'] = pd.to_datetime(df['Date'])
>>> df
   Conc.       Date  I  II
0   8926 2014-11-18  1  22
1   8927 2014-11-20  2  33
2   8928 2014-11-30  3  15
3   8929 2014-12-18  4  80
4   8930 2014-12-28  8  60
5   8931 2014-12-31  9  12

>>> myfilter = df["Date"] > "30/11/2014"
>>> df = df.where(myfilter ,axis=1).dropna()
>>> df['Date'] = df['Date'].dt.strftime('%d/%m/%Y')
>>> df
    Conc.        Date    I    II
3  8929.0  18/12/2014  4.0  80.0
4  8930.0  28/12/2014  8.0  60.0
5  8931.0  31/12/2014  9.0  12.0