Time zone representation (all releases)
Time zones that have the Country/City format are primary time zone IDs. Other time zone IDs are links to the primary time zone. For example, US/Pacific is a link to the America/Los_Angeles time zone.
Both America/Los_Angeles and US/Pacific represent Pacific Standard Time with the same zone offset and Daylight Savings Time (DST) schedule.
Other than the representation, there is no impact on date and time functionality.
In the absence of a default time zone for the user or the system, JVM reads default time zone information from the machine, and depending on how the machine is configured, it might return US/Pacific or America/Los_Angeles.
ServiceNow recommends that admins configure their system with a default timezone “glide.sys.default.tz” to avoid system dependencies