You are quite right, Videostudio does capture the date and time stamp but doesn't offer any functionality to superimpose this on your final video.
You will need a third party software utility to do this. You could always try this http://dts8888.com/vDTS/vdts.htm
COMPAQ something or other with 500Gb Boot Disk, 1Tb external Firewire Disk, 4Gb Memory and a super duper sound card, 19" TFT Monitor etc etc etc
Sony TRV33e : Sony TRV310e : Canon XM2
Sony Vegas Studio editions to v11
Remember, there is always more to learn than there is to teach.