System-Time Dst Recurring - TP-Link TL-SG2216 Cli Reference Manual

and the offset is 30 minutes:
TP-LINK(config)# system-time dst date Apr 1 00:00 Oct 1 00:00 30

system-time dst recurring

Description
The system-time dst recurring command is used to configure the recurring
daylight saving time. It can be configured spanning years. To disable DST
function, please use no system-time dst command.
Syntax
system-time dst recurring {sweek} {sday} {smonth} {stime} {eweek} {eday}
{emonth} {etime} [offset]
no system-time dst
Parameter
sweek——The start week of the daylight saving time. There are 5 values
showing as follows: first, second, third, fourth, last.
sday —— The start day of the daylight saving time. There are 7 values
showing as follows: Sun, Mon, Tue, Wed, Thu, Fri, Sat.
smonth —— The start month of the daylight saving time. There are 12 values
showing as follows: Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec.
stime —— The start moment of the daylight saving time, HH:MM.
eweek ——The end week of the daylight saving time. There are 5 values
showing as follows: first, second, third, fourth, last.
eday —— The end day of the daylight saving time. There are 5 values showing
as follows: Sun, Mon, Tue, Wed, Thu, Fri, Sat.
emonth —— The end month of the daylight saving time. There are 12 values
showing as following: Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov,
Dec.
etime —— The end moment of the daylight saving time, HH:MM.
offset —— The number of minutes to add during the daylight saving time. It is
60 minutes by default.
Command Mode
Global Configuration Mode
42