when is the next reset date?

Late september; 6 months after the last one

This is only assumed. With D3 nearing, only Blizzard knows.

i thought it ws already a set date for the 6 month change??? i thought it was official... its not?

According to a poll on battle.net forums, most people want a 6 mon. reset. Blizzard aims for that but there is no official date.

They say until further notice it's gonna be every 6 months so expect late September

The last reset was March 28th, 2011

Blizzard has stated they plan on doing a reset every 6 months, so late september would be the pruposed timeframe

However this is purly specullation until an actual reset date is announced