adding new line in x_axis_format when using x_is_date=True

[mivanc]

Usually, I am using following formatting for datetimes on x-axis in matplotlib (between date and time is new line \n):
import matplotlib.dates as md
XFMT = md.DateFormatter('%d-%b-%Y\n %H:%M:%S\n')
…
ax.xaxis.set_major_formatter(XFMT)

I tried to implement similar formatting to python-nvd3/lineWithFocusChart. But when I added ‘\n’ to x_axis_format, it crashes:
x_axis_format="%d %b %Y \n %H:%M"

I played around with different options like raw text or double backslashes, but nothing works:
x_axis_format=r"%d %b %Y \n %H:%M"
x_axis_format=r"%d %b %Y \n %H:%M"

Does anyone have an idea how to solve the problem?