I'm trying to format a date with a day without the leading zero

with %d it works fine, but with leading zero

```
date_time.strftime("%d/%m/%y")
result: 04/01/11 

```

I googled and found that I should use %e in stead of %d, but doing the following gives me an empty string.

```
date_time.strftime("%e/%m/%y")
result: 

```

Does this have anything to do with the version of Ruby? I'm using v1.8.7 on a Windows machine.
And more important, is there another way to accomplish a day without leading zero (more convenient then gsub)?