Date issue in dataframe
I have a set of code that works with 0.13.0 and with 0.13.1.  The code snippet is attached.  I've highlighted the row in the code snippet.  In one I have saved the date in the other just "1".  The output is in the snippet of the csv attached.  To point out the second output snippet shows that the "elif" saves the date correctly when the "if" statement saves "1".

![tradetest2_py_-_algotrading_-____projects_algotrading_](https://cloud.githubusercontent.com/assets/1789794/2689518/ab8f31d0-c30b-11e3-8ff8-cbbeabefe68f.jpg)

![tradetest2_py_-_algotrading_-____projects_algotrading_](https://cloud.githubusercontent.com/assets/1789794/2689522/eceed432-c30b-11e3-98ff-2cfac9dddbb0.jpg)

![screenshot_4_13_14__8_05](https://cloud.githubusercontent.com/assets/1789794/2689526/48fab566-c30c-11e3-93fc-8ac6d41c7451.jpg)

![screenshot_4_13_14__8_05](https://cloud.githubusercontent.com/assets/1789794/2689528/5a14f636-c30c-11e3-8bcb-d774edfcae82.jpg)
