If your time zone has daylight savings time active (usually an hour) then you add one to the number of hours time difference.
For example, Melbourne, Australia (where I live) is usually +10 hours from UTC, however in summer when daylight savings is active it is +11 hours.
For example, Melbourne, Australia (where I live) is usually +10 hours from UTC, however in summer when daylight savings is active it is +11 hours.