I'm trying to show a plot from data starting in January, but I don't find the way to set a custom plot range, since it coincides that in that specific month we don't have any data point value.
You could insert a date 'place-holder', so record with date 1/1/2014, and leave the value field empty. Under the Measures menu in the Bar/line view, click on the sub-menu for the specific line measure and choose the option 'Break line', so January date will be visible on the X axis, while the null value measure will not be connected with other values.