The Daylight Saving Time – On/Off setting allows you to configure whether Daylight Saving Time (DST) is applied to your company's selected time zone.
This setting helps ensure that appointment times and other time-related information align with the correct local time.

Navigate to Setup > Company.
Select the appropriate Time Zone from the drop-down menu.
Locate the Daylight Saving Time checkbox.
Check the box to turn Daylight Saving Time ON, or uncheck it to turn it OFF.
Save your changes.
Important: Daylight Saving Time rules vary by location. Verify the appropriate setting for your company's time zone.