diff --git a/time/rdf/time.ttl b/time/rdf/time.ttl
index 3054d99d..4a4eefab 100644
--- a/time/rdf/time.ttl
+++ b/time/rdf/time.ttl
@@ -17,7 +17,7 @@
   dct:creator <mailto:panfeng66@gmail.com> ;
   dct:isVersionOf <http://www.w3.org/TR/owl-time> ;
   dct:license <https://creativecommons.org/licenses/by/4.0/> ;
-  dct:modified "2021-01-27"^^xsd:date ;
+  dct:modified "2024-02-29"^^xsd:date ;
   dct:rights "Copyright © 2006-2021 W3C, OGC. W3C and OGC liability, trademark and document use rules apply."@en ;
   rdfs:label "OWL-Time"@en ;
   rdfs:seeAlso <http://dx.doi.org/10.3233/SW-150187> ;
@@ -31,6 +31,7 @@
   skos:changeNote "2017-02 - intervalIn, intervalDisjoint, monthOfYear added; TemporalUnit subclass of TemporalDuration" ;
   skos:changeNote "2017-04-06 - hasTime, hasXSDDuration added; Number removed; all duration elements changed to xsd:decimal" ;
   skos:changeNote "2021-01-27 - clarified definition and label for time:after and time:before" ;
+  skos:changeNote "2024-02-29 - Fixed datatype on all cardinality restrictions" ;
   skos:historyNote """Update of OWL-Time ontology, extended to support general temporal reference systems. 
 
 Ontology engineering by Simon J D Cox"""@en ;
@@ -586,37 +587,37 @@ Detailed guidance about working with time zones is given in http://www.w3.org/TR
   rdfs:subClassOf :DurationDescription ;
   rdfs:subClassOf [
       rdf:type owl:Restriction ;
-      owl:cardinality 0 ;
+      owl:cardinality "0"^^xsd:nonNegativeInteger ;
       owl:onProperty :days ;
     ] ;
   rdfs:subClassOf [
       rdf:type owl:Restriction ;
-      owl:cardinality 0 ;
+      owl:cardinality "0"^^xsd:nonNegativeInteger ;
       owl:onProperty :hours ;
     ] ;
   rdfs:subClassOf [
       rdf:type owl:Restriction ;
-      owl:cardinality 0 ;
+      owl:cardinality "0"^^xsd:nonNegativeInteger ;
       owl:onProperty :minutes ;
     ] ;
   rdfs:subClassOf [
       rdf:type owl:Restriction ;
-      owl:cardinality 0 ;
+      owl:cardinality "0"^^xsd:nonNegativeInteger ;
       owl:onProperty :months ;
     ] ;
   rdfs:subClassOf [
       rdf:type owl:Restriction ;
-      owl:cardinality 0 ;
+      owl:cardinality "0"^^xsd:nonNegativeInteger ;
       owl:onProperty :seconds ;
     ] ;
   rdfs:subClassOf [
       rdf:type owl:Restriction ;
-      owl:cardinality 0 ;
+      owl:cardinality "0"^^xsd:nonNegativeInteger ;
       owl:onProperty :weeks ;
     ] ;
   rdfs:subClassOf [
       rdf:type owl:Restriction ;
-      owl:cardinality 1 ;
+      owl:cardinality "1"^^xsd:nonNegativeInteger ;
       owl:onProperty :years ;
     ] ;
   owl:deprecated "true"^^xsd:boolean ;