/usr/bin/lsclocks

Usage:
 lsclocks [options]

Options:
 -J, --json                 use JSON output format
 -n, --noheadings           don't print headings
 -o, --output <list>        output columns
     --output-all           output all columns
 -r, --raw                  use raw output format
 -t, --time <clock>         show current time of single clock
 --no-discover-dynamic      do not try to discover dynamic clocks
 --no-discover-rtc          do not try to discover RTCs
 -d, --dynamic-clock <path> also display specified dynamic clock
 -c, --cpu-clock <pid>      also display CPU clock of specified process
 -x, --rtc <path>           also display specified RTC

 -h, --help                  display this help
 -V, --version               display version

Available output columns:
             TYPE  <string>  type
               ID  <number>  numeric id
            CLOCK  <string>  symbolic name
             NAME  <string>  readable name
             TIME  <number>  numeric time
         ISO_TIME  <string>  human readable ISO time
            RESOL  <string>  human readable resolution
        RESOL_RAW  <number>  resolution
         REL_TIME  <string>  human readable relative time
        NS_OFFSET  <number>  namespace offset

For more details see lsclocks(1).