UTC brings its own batch of problems when it comes to local time relative scenarios.
Last time I looked best practice for a real calendar app was to store in local time with time zone, not UTC with offset.
UTC is time in theory. Points in time separated by numbers of seconds. Great until the reality of time being a social construct breaks your assumptions. Still, use UTC until you are actually building a calendar app. Depending on your use case, consider storing timezone instead of offset.
Last time I looked best practice for a real calendar app was to store in local time with time zone, not UTC with offset.
UTC is time in theory. Points in time separated by numbers of seconds. Great until the reality of time being a social construct breaks your assumptions. Still, use UTC until you are actually building a calendar app. Depending on your use case, consider storing timezone instead of offset.