i'm sorry if google was too much, again, perhaps try "period vwap" into it. if you don't see a couple thinkscripts there, you're google must be broken. i see two there, one which allows entry of a 'start date' to begin the MA, and, the other sets the period by the chart length; 5day, 10day, 30day, 180day, 1yr, ytd, etc. (or, of course either the 1day or 'today' chart, they will differ.) have fun.
I was not aware of this think scripter so I didn't know I was suppose to look for it. Looks amazing, Thanks! * update: I can't see the script where I can choose 5/10/30/180... maybe you need to be a pro member?