'e'在格式'%e %B %Y'中是一个糟糕的指令

I'm trying to convert a string given in the "DD MM YYYY" format into a datetime object. I expect the day integer in my output to consist of a single digit if the day in the date is in single digits. For example, the input '1 May 2014' should be converted to '1 May 2014' after converting into a datetime object instead of '01 May 2014'. I'm trying to convert a string given in the "DD