Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 209)

System Configuration and Monitoring Commands
Software Reference for x310 Series Switches
C613-50046-01 REV A AlliedWare Plus TM Operating System - Version 5.4.4C 8.9
Examples To set a summertime definition for New Zealand using NZST (UTC+12:00) as the standard
time, and NZDT (UTC+13:00) as summertime, with summertime set to start on the 1st
Sunday in October, and end on the 3rd Sunday in March, use the command:
To remove any summertime settings on the system, use the command:
Related Commands clock summer-time date
clock timezone
awplus(config)# clock summer-time NZDT recurring 1 sun oct 2:00
3 sun mar 2:00 60
awplus(config)# no clock summer-time