Very useful. There is also the stat / istat commands to display the same information taken out from the filesystem with the 3 three components of timestamp. Linux stat might offer some additonal functionality fbeing able to
customise the output sometimes, reducing the amount of information.
eg, istat command for AIX 7.1 (IBM Unix)
https://www.ibm.com/support/knowledgecenter/en/ssw_aix_71/com.ibm.aix.cmds3/istat.htm
- Date of the last i-node update ("physical storage information")
- Date of the last file modification
- Date of the last reference to the file ("last access")