i found out the silution for this issue and it WORKS
first go to: setting>>date-time>> change the date to be tomorow (24 hours ahead)
second: go to: Whatsapp>>setting>>chat setting>> advanced>> change the last timestamp from ON to OFF
third: go to: setting**>> date-time>>> set the *time to be further 24 hours ahead.
Fourth step: go back to Whatsapp>> setting>>chat setting>> advanced>> change the button to ON
You can now check Whatsapp and all works perfectly.
Finally , *you will need to go And reset the clocks to their original time
now you can view the last time stamp of your contacts