The FME ArcGIS Online writer should expose a time zone setting that allows you to set the time zone of your data when publishing or appending data. By default, ArcGIS Online assumes all data is stored in UTC but when publishing directly to ArcGIS Online through the UI or using the ArcGIS Python API the time zone can be set to the time zone of your data. This setting in the writer would allow dates to be published and updated accurately.
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