log4net写日志的时间附带时区信息
<conversionPattern value="%date{yyyy-MM-dd HH:mm:ss.fffzzz} [%thread] %-5level %logger - %message%newline" />
https://logging.apache.org/log4net/log4net-1.2.13/release/sdk/log4net.Layout.PatternLayout.html
https://stackoverflow.com/questions/44667663/convert-datetime-to-specific-timezone-for-tostring