Although in Performance, the Block caching is disabled but I've a block created by Clock module(http://drupal.org/project/clock) when accessed as anonymous user it does not update the clock on every page reload.
I've even tried clearning browser cache but it works fine when logged in. For registered users it seems block caching is disabled.
The Clock block is there in this site: http://bit.ly/PKI2M8 - please scroll to bottom-most right block titled 'Rail Time'.
How can I disable caching of this block?