Was Jesus really in the tomb three days?

Some say the Bible is wrong because Friday to Sunday is not three days for Jesus to be in tge tomb.The answer is simple.  In those times a day started at dusk.  Therefore, Thursday at dusk wsas on day, dusk Friday was a second day, and dusk Saturday began the third day. So, Jesus was in the tomb three days, but only three days becauses HE IS RISEN!  PR5AISE GAD.