D-Link DES-1228 Reference Manual page 194

config time_zone
Restrictions
Example usage:
To configure time zone settings:
DES-1228/ME:4#config time_zone operator + hour 2 min 30
Command: config time_zone operator + hour 2 min 30
Success.
DES-1228/ME:4#
DES-1228/ME Layer 2 Metro Ethernet Switch CLI Reference Manual
hour – Select the number of hours different from GMT.
min – Select the number of minutes difference added or subtracted to adjust the time
zone.
Only Administrator-level users can issue this command.
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