Exchange rate valid from date TCURR table

Hi Gurus,

I entered the tranasaction code OB08 exchange rate type as 'M' valid from date as '01.01.2008'

But when i checked in TCURR table i am finding valid from date as '79919898' .

May i know how it came like this??

please give me suggestion as soon as possible.

Regards

Prakash