srry for the noob question, i just wanted to know the exact month, im pretty sure its next year though right?
210,000(when the change occurs) - 122,922(current block) = 87078(blocks left)
87078 / 7(average blocks per hour*) / 24(hours in a day) = 518(days till change)
518 / 30(days in a month) = 17.27(months left till change)
518 / 365(days in a year) = 1.419(years to change)
Here is a precise answer to your question assuming the average rate is seven blocks an hour from now(5-9-2011, lunchtime in USA) till the change.
Hope this helped you
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*7 blocks an hour is an estimate, if you find a more informed prediction just plug it into the equation above for a more precise answer.