In ArcGIS Pro 3.2 and newer, date fields are changed to high precision when publishing to ArcGIS Online without an option to avoid the change.

Workaround

The issue is not reproducible in ArcGIS Pro 3.1.X or prior.

• Delete the existing tracking fields from the hosted feature class and allow the Enable Editor Tracking tool to recreate them.
• Omit the creation date field and the last edit date field while running the tool.
• Export the hosted feature layer to a file geodatabase in ArcGIS Online or in the portal, download the geodatabase, then add it to the ArcGIS Pro project.
• Use ArcPy field mapping to change the high precision to low precision when exporting the feature service (see sample code below).

# Fix Precision

fm_c = arcpy.FieldMap()

fm_c.addInputField(service_url, created_at_fname)

updated_out_field = fm_c.outputField

updated_out_field.precision = 0

fm_c.outputField = updated_out_field

field_mappings_corrected.addFieldMap(fm_c)

Steps to Reproduce