FortiGate
FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
hrahuman_FTNT
Description This article describes that some time,  FortiGate  log time will be different from the logging device or disk.
Scope FortiGate
Solution

Disable the daylight saving on the FortiGate will correct the log time in both logging units and disk.

 

# conf system global
    set dst disable
end