Python Pandas: Get index from column value -

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very simple question: have pandas dataframe. 1 of columns looks this. 

date 2016-04-15 2016-04-14 2016-04-13 2016-04-12  2016-04-11 2016-04-08

how index of particular value assuming values unique.

for example, "2016-04-13" return 2

use df.index.get_loc('2016-04-14') integer location requested label. return 1 intital starts 0. can add 1 index value 2


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