problem with the second mission achievment

Games Other Halo
1

I tried the warthog achievment of the second mission,but i cant
I have seen videos where people go to a cliff with a warthog and get the achievment,but i make the same and i havent

2

Your Xbox 360 clock needs to be at 12:00 Midnight then do the jump, unfortunatly.

3

Just change your 360 clock to a timezone where It’s midnight then change it back after you get the achievement