Technical Tip: Retrieve Daylight Saving Time [DST] start and end date/time according to the currently configured time zone

This article describes how to retrieve and verify the daylight saving time [DST] start and end date/time data according to the currently configured time zone on FortiGate.

FortiOS v6 and v7.

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