Strip spaces from date string before parsing

[riclage]

Problem
Some csv files can have an extra space after or before the date. For example:

10 Dec 2018 ; To John Doe  ; 20.75 ;  ;  ;  ; 48.35; transfers; groceries

Setting the csv_date_format to %d %b %Y won't work because the date has this extra space in the end: "10 Dec 2018 ".

Solution
We use .strip() on the date string before parsing it.