XCDP sites (MGC, my360stats etc) have access to a data feed which gives basic user profile data, and some stats for the last sixteen games you've played. (game name, time you last played it, number of achievements and gamerscore)
It doesn't include data for individual achievements (we're optimistic they may offer that someday).
Would be great to calculate time from first achievement to last in days and hours, average time taken to complete a game, etc. etc.
Open this page in a new window and then "View Source", scroll down till you find...
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You have there, month (although it appears to be one less than the actual month), day, year, hour and minute.
I believe the reason it's there is that they're using a GMT timestamp and then localisation will modify the date you see on the page based upon your time zone. e.g. If you unlock an achievement at 02:30 GMT on 8th Aug, when you someone in the US looks at the achievement summary it would display as 7th Aug as they're at least GMT-5
In the summary URL, try changing http://live.xbox.com/en-GB/ to http://live.xbox.com/en-US/ see if that makes any difference!?
I could be wrong but I'm glad I stumbled on it as it allows me to confirm accurately for http://www.my360stats.com/games/first2finish/
I tested the timezone thing out by unlocking an achievement, noting what time it popped up, then checking my own summary about 20/30 minutes later. As we're currently BST (GMT+1) it was an hour out.
I guess it doesn't really matter what time zone it is as long as it's consitent for all gamers.
∞ 李察
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GSW ∞