Technically, no, it's not possible. We had it at one time because of a different version of the vBShout, though the newer version (which helps plenty of things) uses the FlatFile system, which has an incompatability with time stamping - ZeroTolerance (the author) could have formed a work around, but the performance would be quite sluggish and resource-hogging.
A new version of vBShout is in the works. I believe the time stamps return in the new version. Please be patient.