I have some data values of type date/time (the last date that a resource was accessed) and I wish to chart this data on the y-axis against  the different categories of resource on the x-axis.

What would be a sensible type of chart for displaying this sort of data ?  For example is a histogram / bar chart satisfactory or is there a different graph type more applicable ?

EDIT: Are bar charts for only displaying quantities - can dates be considered quantities ?