$ ./bin/mysqldump --help --verbose | grep -A3 -m1 'as-of' 

  --as-of=name        Dump system versioned tables as of the specified timestamp. 

                      Note that table structures are always dumped, irrespective of 

                      the date/time specified. Note that the timestamp is interpreted 

                      according to the --tz-utc setting (ref MDEV-26943 and --tz-utc).

$ ./bin/mysqldump --help --verbose | grep -A5 -m1 'tz-utc' 

  --tz-utc            This option enables TIMESTAMP columns to be dumped and 

                      reloaded between servers in different time zones. 

                      mysqldump sets its connection time zone to UTC before 

                      commencing the dump, and adds SET TIME_ZONE=´+00:00´ 

                      to the top of the dump file.