Q:

Design pattern to display missing data in line/bar chart of a daily data feed

I am displaying a daily data feed in my app, i.e. one value per day.
The data is displayed in either a bar or line chart.
In the event that a data point is missing on a given day, I want to indicate somehow that the value is missing on that day. 
Here are a couple initial design concepts that are quite visually distracting or strong. I'm aiming for a design that is less distracting, more elegant.

(If my wording of the question is not specific enough, please leave comments and I'll improve it.)

A:

Even I'm facing same issue in the analytics product I'm working on now.
My line of thinking is
Use solid base line(axis) for all the positions/bars which represent data existence.
Use dotted base line for all the positions where data is missing as shown in the Mockup below:-

Highlight the axis label where there is dotted line and provide tooltip info regarding missing data.
This I guess is the natural analogy, which is, solid line indicating something present/existing and dotted line indicating something missing or virtual.
And, it is well known that dotted lines are meant for filling something which is not there.

A:

Do not display days with missing data, at the X-axis add three dots when the days are not continuous. See image below :

