$ sudo apt install dateutils                   
[sudo] password for sermnadmin: ******                                     
Reading package lists... Done                                   
Building dependency tree                                              
Reading state information... Done                                    
The following NEW packages will be installed:                          
  dateutils                                   
0 upgraded, 1 newly installed, 0 to remove and 15 not upgraded.
Need to get 217 kB of archives.            
After this operation, 1,555 kB of additional disk space will be used.
Get:1 http://ftp.es.debian.org/debian buster/main amd64 dateutils amd64 0.4.3-1 [217 kB]
Fetched 217 kB in 0s (586 kB/s)   
Selecting previously unselected package dateutils.                   
(Reading database ... 253630 files and directories currently installed.)
Preparing to unpack .../dateutils_0.4.3-1_amd64.deb ...           
Unpacking dateutils (0.4.3-1) ...                     
Setting up dateutils (0.4.3-1) ...                          
Processing triggers for install-info (6.5.0.dfsg.1-4+b1) ...    
Processing triggers for man-db (2.8.5-2) ...