How to determine the timezone from exported system Windows Event log

Loading exported Windows Event log using Event Viewer application will display the time based on local time. To determine the timezone of the log file look for Event ID 6013 from source/provider EventLog on the seventh data element, see below for reference.

Another thing to note is that you have to consider daylight savings time (DST). In the above example, the timezone is 360 Central Standard Time or UTC-6 but due to DST, instead of adding 360 minutes to the stored time, you have to use 300 or UTC-5. 

REF:1