Windows user strftime bug

[semohr]

For windows users plotting functions do not work with default rcParams.

As one can see here Windows does not support %-d. Which we use in our default rcParameters.

We have to change that or create a workaround for windows users.

[jdehning]

What does the - in %-d do? I would simply remove it, if it is not important...

[semohr]

The - removes the leading 0 if present. %#d does the same for windows but all of that is very operating system depending. We can just replace it with %d.

Not a big problem at all and easy to fix I just found it quite interesting. And it took us quite some time to find this bug.