Daylight savings time are not being reflected in Jira Cloud.
Platform Notice: Cloud - This article applies to Atlassian products on the cloud platform.
Summary
When using GMT timezone settings in Jira Cloud, Daylight savings time is not being reflected.
Diagnosis
You can view default user time zone by navigating to Viewing System → General Configuration → Time Zone → Default user time zone.
When set to Region GMT, daylight savings changes are not reflected.
If you change these settings to a geographic location(Vancouver for example) daylight savings will be accurate.
Cause
GMT offset is a standard value that will always be what is set. For example, GMT -7 will always be -7 from GMT particular time zone and UTC.
However, using a specific region location will be accurate to the daylight savings.
The system will adjust to the correct time despite the GMT offset displaying before the location name in the list.
Users are able to override the default user time zone by setting the timezone in their profile.
More information available at View and update your profile
Solution
Navigate to General Configuration → Time Zone → Default user time zone and set the timezone to a specific region location that matches your current time.