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    <p>I never found the ultimate technical reason for the discrepancy between the timestamps from powershell vs. explorer, but I was able to correct for it by just subtracting an hour off all the timestamps I got from the powershell script. After doing that, however, there was still a large amount of disagreement between the time stamps I got from out of my XML log files and the ones I pulled from the filesystem using the powershell script. Reasoning that the end-users probably stayed in the same time zone when they were generating the files, I wrote a little algorithm to estimate the time zone of each user by evaluating the median amount of time between steps 1 and 2 in the workflow and steps 2 and 3. If there was a problem with the user's time zone, one of those two timespans would be negative (since the time of the step 2 event was estimated and the times of the steps 1 and 3 events were known from the XML logs.) I then rounded the positive value down to the nearest hour and applied that number of hours as an offset to that user's step 2 times. Overall, this took the amount of bad data in my dataset from 20% down to 0.01%, so I'm happy with the results.</p> <p>In case anyone needs it, here's the code I used to make the hour offset in the timestamps (not powershell code, this was in a C# script that handled another part of data processing):</p> <pre><code> DateTime step2time = DateTime.Parse(LastModifyDate); TimeSpan shenanigansCorrection = new TimeSpan(step2time.Hour-1,step2time.Minute,step2time.Second); step2time= step2time.Date + shenanigansCorrection; </code></pre> <p>The reason for redefining the <code>step2time</code> variable is that DateTimes aren't mutable in .NET. </p>
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