Vincent off-by-one datetime axis bug after Monthly resampling

[ianozsvald]

Hi there. I read that Vincent is now in support-mode only so I'm filing this more for information than in hope of a fix. If there is a fix or an alternative way of expressing the data, I'd love to hear about it.

Using a pandas DataFrame with a DateTime index, if I resample with a Monthly timeframe and use a Line to plot the count of events the x-axis is off-by-one-month (it runs Feb..December with an empty final entry). If I plot the raw data it is shown Jan..Dec and if I resample Weekly it is also shown with a correct x-axis.

Here's a screenshot of my Notebook showing the bad x-axis after resampling. The first chart shows the raw data (with correct x-axis labels, accepting that January isn't shown), the second chart is the resampled data where the left-most x-axis label is "February" rather than "January":

If I resample by Weekly to make the counts then the x-axis looks correct:

If anyone has a fix to make the x-axis look right for a monthly resample, I'd love to hear it.