When does Overture measure a conversion

At the date of the click or the date of the sale?

[Robsp]

I'm used to adwords measuring conversions at the date of the actual click. Does overture administer conversions in the same way or are the conversions attributed to the day of the sale/conversion?

[eWhisper]

Overture counts the sale on the day it happened - not the day of the original click.

[Robsp]

I figured that looking at the conversion patterns but could not find this anywhere in their docs. Thanx eWhisper.