Pandas series of datetimes in python -

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I have a series that is purely datetimes. Call it at chain 1 .

How can I remove the series from the series in the most effective way to create a new series of months only?

For example. 

  series1.month

does not work. But for every line, it will work

In panda version 0.14 and older, you apply Can date to date value: 

  chain 1 .apply (Lambda x: x.month)   to remove  In 
 
 0.15, a new  datetime  series accessor simplifies the operation (thanks @ crisb): 
 
  series1.dt.month  
 
 here is one.

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