Graphs using dates

I have a column of values, each associated with a particular date in the adjacent column. The dates and values are listed in chronological order, but they are not evenly spaced in time. (Values are recorded on randomly spaced dates.) I want to plot values as a function of time with the dates spaced according to the number of elapsed days. A standard approach yields all dates equally spaced with no regard for the number of elapsed days between the actual dates.