adjtimex software package provides kernel time variables configuration utility, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install adjtimex
adjtimex is installed in your system.
Make ensure the adjtimex package were installed using the commands given below,
$ sudo dpkg-query -l | grep adjtimex *
You will get with adjtimex package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Administration Utilities |
| Package | adjtimex |
| Version | 1.29-3 |
| Description | kernel time variables configuration utility |
| Sub Section | admin |