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In FortiOS, daylight saving time [DST] is enabled by default so that the system can adjust itself automatically. For example:
Time Zone (GMT+1:00) with DST start and end:
show system global | grep time
set timezone 28 <-- 28 (GMT+1:00) Brussels, Copenhagen, Madrid, Paris
diagnose sys dayst-info
The current timezone '(GMT+1:00) Brussels, Copenhagen, Madrid, daylight saving time starts at Sun Mar 26 02:00:00 2023, ends at Sun Oct 29 02:00:00 2023
Time Zone (GMT+3:00) with No DST information:
FortiOS does not have daylight saving time dates for GMT+3 time zone as, at the time this article was written, daylight saving time does not apply to that time zone.
show system global | grep time
set timezone 38 <-- 38 (GMT+3:00) Kuwait, Riyadh
diagnose sys dayst-info
The current timezone '(GMT+3:00) Riyadh , Kuwait' doesn't have daylight saving time
To disable the DST feature on the FortiGate, such as because DST has been modified or no longer applies to a given time zone, run the following configuration in the CLI:
config system global
set dst disable
end
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