You should be able to. You can format the x-axis on the graph to be timestamp. To format the x-axis right click your XY graph and then select Properties. You then goto the Format and Precision tab to setup what you need.
I have attached an example that show 3 XY graphs.
Graph 1 is the number of seconds since 1904.
Graph 2 has the X-Axis set to Absolute Time format
Graph 3 has the X-Axis set to Relative Time format. For this one I have used a timestamp as a reference point and timestamp for the current time. If you subract the reference timestamp from the current timestamp you have the absolute time.
Hopefully this will give you what you need. But if you need more help please post your VI that demonstrates your problem so we can have a look at it.
David
