Only two lines
clock timezone AEST 10 clock summer-time AEDT recurring 1 Sun Oct 2:00 1 Sun Apr 3:00
In Sydney, daylight saving starts in first Sunday in October, and ends in first Sunday in April.
After configuration, issue command
show clock detail will show whether summer time will start/end.
asa# show clock detail 02:03:39.305 AEST Mon Jul 30 2018 Time source is NTP UTC time is: 16:03:39 UTC Sun Jul 29 2018 Summer time starts 02:00:00 AEST Sun Oct 7 2018 Summer time ends 03:00:00 AEDT Sun Apr 7 2019
- Cisco ASA 9.8 CLI Configuration Guide – Basic Settings
- Australian Government – Time zones and daylight savings