Try need to run apt update first, so that it updates the repos to what are latest.
Code:
root@kali:~# apt updateHit:1 http://http.kali.org/kali kali-rolling InRelease
Hit:2 http://http.re4son-kernel.com/re4son kali-pi InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
root@kali:~# apt install chrony
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
libopts25 sntp
Use 'apt autoremove' to remove them.
Suggested packages:
networkd-dispatcher
The following packages will be REMOVED:
ntp
The following NEW packages will be installed:
chrony
0 upgraded, 1 newly installed, 1 to remove and 0 not upgraded.
Need to get 229 kB of archives.
After this operation, 1,604 kB disk space will be freed.
Do you want to continue? [Y/n]