The time points of the web log and ftp log record in the IIS service is inconsistent with the server system time, with an difference of 8 hours, as shown in the figure below:
Due to the IIS log mechanism, IIS log W3C format is created in Greenwich Mean Time, so it deviates from the server system time for 8 hours.
Open IIS Manager, click on the ftp site, and right click the ftp log.
Give a file name to Use Local Time at the bottom, tick in front of Scroll Update, and click Apply.
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