The application set time zone captures the user timing based on the configuration settings in Google Analytics, whereas the user-specific time zone is the time of the country where the user belongs. For example, let's say I set my Google Analytics time zone to (GMT-7.00) Los Angeles time, which is 9:00 AM. If a local user visits my website, both the user's time and the application set time will be reported as 9:00 AM. But let's suppose a user visits from a different country, like India, at 5:00 PM, then it won't be reported as 5:00 PM in Google Analytics. Here, Google Analytics will convert the time according to the application time set up, which will be reported as 7:30 AM.