Want to retreive recording from hard disk of the dvr

Hi.

I have one Chinese 4 ch H.264DVR, a 500Gb internal HDD.

Unfortunately i donot know how but the date was entered in the system was 01/04/20113. Year was five digit instead of 4 digit. As now I want to playback I cannot see any image as the time is not real world time (it was set to march 20113),

Hard disk is in good condition and no sound is coming.

I tried with the DVR recovery by DVR examiner but the following error come after it recognized the hard disk "Error encountered during scan. String was not recoginized as a valid date time"

HOW do we get the data recordings back to being present?

This is very important as there was some theft and need to check recording.

Kindly help if we can retrieve the recording.

Thanks

Jas