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[xXachayanXx]

i am not able to update when i am trying

sudo apt-get update

its showing

Release file for http://http.kali.org/kali/dists/kali-rolling/InRelease is not valid yet (invalid for another 8h 8min 49s). Updates for this repository will not be applied.

[Mister_X]

You need to fix the time on your system. Even if it's correct, the timezone may be incorrect; you need to fix that first before setting the time.