Chapter 1 What’s New for FortiOS 5.2.1 : System Features : DHCP Server Configuration
  
DHCP Server Configuration
The following attributes have been added for DHCP server configuration to both the web-based manager and the CLI:
Time zone
TFTP server
TFTP filename
Figure 4: DCHP server settings
Syntax
config system dhcp server
edit <integer>
set timezone-option {disable | default | specify}
set timezone <timezone_code>
set tftp-server <string>
set filename <file_name>
end
end