[vdr] set system time - no effect?

["Nano" <nanomail@gmx.net>]

Hello,
 
i tried to get the current time via transponder (ARD) im my two DVB-s
VDR.
My system-clock is set to UTC.
if i start vdr there is a message like:.. local time ... system time...
so it´recognizes the differenz; but the right tine wia tranbsponder is
not written into cmos!
if i say "clock" and "date" there is allways a diference. date is right,
but the cmos clock is wrong and vdr does
not correct it ?!?! (also tried under root).
Is there a certain time when it is written? (only with the epg scan
every 5 hours?) 
 
Thanks Martin