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Use 'geoserverdatetime' in Custom CSS Class to use in form.
Use 'geoserverdatetimesql' in Custom CSS Class to use in form.
Use 'geoserverdate' in Custom CSS Class to use in form.
Use 'geoservertime' in Custom CSS Class to use in form.
Use 'geoserverepoch' in Custom CSS Class to use in form.
Use 'geoservermilepoch' in Custom CSS Class to use in form.