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It is clear from the information presented by NetAnalysis that the importation time zone setting is incorrect.  Examination of the ActiveBias column also shows that there appears to be only one bias value identified.  This indicates a single time zone setting but an incorrect import setting for NetAnalysis.  In this case, you would simply check the time zone settings, select the correct value and then re-import the data.


Dealing with Mixed Time Zone Data

If you have evidence of multiple time zones being set, you will end up with miscalculated timestamps if you select any of the standard time zone settings. 

The recommended course of action in this case is to set the NetAnalysis time zone option to ‘No Time Zone Date / Time Adjustment’.  With this setting, NetAnalysis will calculate the date/times exactly as they are stored in the file.  You can then re-import the data into NetAnalysis.  NetAnalysis will only represent what it knows to be accurate (assuming the clock was accurate on the system and the computer was being used in the time zone it was set to use).

To access the time zone settings, select Tools » Options from the Tools menu.  Select ‘* No Time Zone Date/Time Adjustment’ from the Suspect System Base Time Zone dropdown list (as shown in Figure 4).


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Figure 4