Vcenter SSL Certificate valid from property wrong configured

Hi,

a few days ago  I installed the vCenter, not caring about the date and time. After installation everything worked fine, but after changing the  date and time, i can't start the vcenter. I figured out, this is because my ssl Certificate is valid from 18.10.2014 (the date set by the installation). If  I change the date  to 18.10,  I can start the vcenter.

What's the easiest way to change this parameter? Except installing the vcenter again?

VCenter 5.5

C:\ProgramData\VMware\VMware VirtualCenter\SSL

Windows Server 2008R2

Thanks