diff --git a/schema/json/metaschema-datatypes.json b/schema/json/metaschema-datatypes.json
index e76ccacbe..c663d6e85 100644
--- a/schema/json/metaschema-datatypes.json
+++ b/schema/json/metaschema-datatypes.json
@@ -27,13 +27,13 @@
     "DateTimeDatatype": {
       "description": "A string representing a point in time with an optional timezone.",
       "type": "string",
-      "pattern": "^(((2000|2400|2800|(19|2[0-9](0[48]|[2468][048]|[13579][26])))-02-29)|(((19|2[0-9])[0-9]{2})-02-(0[1-9]|1[0-9]|2[0-8]))|(((19|2[0-9])[0-9]{2})-(0[13578]|10|12)-(0[1-9]|[12][0-9]|3[01]))|(((19|2[0-9])[0-9]{2})-(0[469]|11)-(0[1-9]|[12][0-9]|30)))T(2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9])(\\.[0-9]*[1-9])?(Z|(-((0[0-9]|1[0-2]):00|0[39]:30)|\\+((0[0-9]|1[0-4]):00|(0[34569]|10):30|(0[58]|12):45)))?$"
+      "pattern": "^(((2000|2400|2800|(19|2[0-9](0[48]|[2468][048]|[13579][26])))-02-29)|(((19|2[0-9])[0-9]{2})-02-(0[1-9]|1[0-9]|2[0-8]))|(((19|2[0-9])[0-9]{2})-(0[13578]|10|12)-(0[1-9]|[12][0-9]|3[01]))|(((19|2[0-9])[0-9]{2})-(0[469]|11)-(0[1-9]|[12][0-9]|30)))T(2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9])(\\.[0-9]+)?(Z|(-((0[0-9]|1[0-2]):00|0[39]:30)|\\+((0[0-9]|1[0-4]):00|(0[34569]|10):30|(0[58]|12):45)))?$"
     },
     "DateTimeWithTimezoneDatatype": {
       "description": "A string representing a point in time with a required timezone.",
       "type": "string",
       "format": "date-time",
-      "pattern": "^(((2000|2400|2800|(19|2[0-9](0[48]|[2468][048]|[13579][26])))-02-29)|(((19|2[0-9])[0-9]{2})-02-(0[1-9]|1[0-9]|2[0-8]))|(((19|2[0-9])[0-9]{2})-(0[13578]|10|12)-(0[1-9]|[12][0-9]|3[01]))|(((19|2[0-9])[0-9]{2})-(0[469]|11)-(0[1-9]|[12][0-9]|30)))T(2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9])(\\.[0-9]*[1-9])?(Z|(-((0[0-9]|1[0-2]):00|0[39]:30)|\\+((0[0-9]|1[0-4]):00|(0[34569]|10):30|(0[58]|12):45)))$"
+      "pattern": "^(((2000|2400|2800|(19|2[0-9](0[48]|[2468][048]|[13579][26])))-02-29)|(((19|2[0-9])[0-9]{2})-02-(0[1-9]|1[0-9]|2[0-8]))|(((19|2[0-9])[0-9]{2})-(0[13578]|10|12)-(0[1-9]|[12][0-9]|3[01]))|(((19|2[0-9])[0-9]{2})-(0[469]|11)-(0[1-9]|[12][0-9]|30)))T(2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9])(\\.[0-9]+)?(Z|(-((0[0-9]|1[0-2]):00|0[39]:30)|\\+((0[0-9]|1[0-4]):00|(0[34569]|10):30|(0[58]|12):45)))$"
     },
     "DayTimeDurationDatatype": {
       "description": "An amount of time quantified in days, hours, minutes, and seconds.",
diff --git a/schema/xml/metaschema-datatypes.xsd b/schema/xml/metaschema-datatypes.xsd
index bcb95087d..ff4ea8e22 100644
--- a/schema/xml/metaschema-datatypes.xsd
+++ b/schema/xml/metaschema-datatypes.xsd
@@ -44,7 +44,7 @@
 			<xs:documentation>A string representing a point in time with an optional timezone.</xs:documentation>
 		</xs:annotation>
 		<xs:restriction base="xs:dateTime">
-			<xs:pattern value="(((2000|2400|2800|(19|2[0-9](0[48]|[2468][048]|[13579][26])))-02-29)|(((19|2[0-9])[0-9]{2})-02-(0[1-9]|1[0-9]|2[0-8]))|(((19|2[0-9])[0-9]{2})-(0[13578]|10|12)-(0[1-9]|[12][0-9]|3[01]))|(((19|2[0-9])[0-9]{2})-(0[469]|11)-(0[1-9]|[12][0-9]|30)))T(2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9])(\.[0-9]*[1-9])?(Z|(-((0[0-9]|1[0-2]):00|0[39]:30)|\+((0[0-9]|1[0-4]):00|(0[34569]|10):30|(0[58]|12):45)))?"/>
+			<xs:pattern value="(((2000|2400|2800|(19|2[0-9](0[48]|[2468][048]|[13579][26])))-02-29)|(((19|2[0-9])[0-9]{2})-02-(0[1-9]|1[0-9]|2[0-8]))|(((19|2[0-9])[0-9]{2})-(0[13578]|10|12)-(0[1-9]|[12][0-9]|3[01]))|(((19|2[0-9])[0-9]{2})-(0[469]|11)-(0[1-9]|[12][0-9]|30)))T(2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9])(\.[0-9]+)?(Z|(-((0[0-9]|1[0-2]):00|0[39]:30)|\+((0[0-9]|1[0-4]):00|(0[34569]|10):30|(0[58]|12):45)))?"/>
 		</xs:restriction>
 	</xs:simpleType>
 	
@@ -53,7 +53,7 @@
 			<xs:documentation>A string representing a point in time with a required timezone.</xs:documentation>
 		</xs:annotation>
 		<xs:restriction base="DateTimeDatatype">
-			<xs:pattern value="(((2000|2400|2800|(19|2[0-9](0[48]|[2468][048]|[13579][26])))-02-29)|(((19|2[0-9])[0-9]{2})-02-(0[1-9]|1[0-9]|2[0-8]))|(((19|2[0-9])[0-9]{2})-(0[13578]|10|12)-(0[1-9]|[12][0-9]|3[01]))|(((19|2[0-9])[0-9]{2})-(0[469]|11)-(0[1-9]|[12][0-9]|30)))T(2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9])(\.[0-9]*[1-9])?(Z|(-((0[0-9]|1[0-2]):00|0[39]:30)|\+((0[0-9]|1[0-4]):00|(0[34569]|10):30|(0[58]|12):45)))"/>
+			<xs:pattern value="(((2000|2400|2800|(19|2[0-9](0[48]|[2468][048]|[13579][26])))-02-29)|(((19|2[0-9])[0-9]{2})-02-(0[1-9]|1[0-9]|2[0-8]))|(((19|2[0-9])[0-9]{2})-(0[13578]|10|12)-(0[1-9]|[12][0-9]|3[01]))|(((19|2[0-9])[0-9]{2})-(0[469]|11)-(0[1-9]|[12][0-9]|30)))T(2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9])(\.[0-9]+)?(Z|(-((0[0-9]|1[0-2]):00|0[39]:30)|\+((0[0-9]|1[0-4]):00|(0[34569]|10):30|(0[58]|12):45)))"/>
 		</xs:restriction>
 	</xs:simpleType>
 
diff --git a/website/content/specification/datatypes.md b/website/content/specification/datatypes.md
index 0c5ec833c..9dff077f4 100644
--- a/website/content/specification/datatypes.md
+++ b/website/content/specification/datatypes.md
@@ -212,10 +212,11 @@ For example:
 ```
 2019-09-28T23:20:50.52Z
 2019-09-28T23:20:50.52
+2019-09-28T23:20:50.1000
 2019-12-02T16:39:57-08:00
 2019-12-02T16:39:57
-2019-12-31T23:59:60Z
-2019-12-31T23:59:60
+2019-12-31T23:59:59Z
+2019-12-31T23:59:59
 ```
 
 In XML Schema this is represented as a restriction on the built-in type [dateTime](https://www.w3.org/TR/xmlschema11-2/#dateTime) as follows:
@@ -223,7 +224,7 @@ In XML Schema this is represented as a restriction on the built-in type [dateTim
 ```XML
 <xs:simpleType name="DateTimeDatatype">
   <xs:restriction base="xs:dateTime">
-    <xs:pattern value="(((2000|2400|2800|(19|2[0-9](0[48]|[2468][048]|[13579][26])))-02-29)|(((19|2[0-9])[0-9]{2})-02-(0[1-9]|1[0-9]|2[0-8]))|(((19|2[0-9])[0-9]{2})-(0[13578]|10|12)-(0[1-9]|[12][0-9]|3[01]))|(((19|2[0-9])[0-9]{2})-(0[469]|11)-(0[1-9]|[12][0-9]|30)))T(2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9])(\.[0-9]*[1-9])?(Z|(-((0[0-9]|1[0-2]):00|0[39]:30)|\+((0[0-9]|1[0-4]):00|(0[34569]|10):30|(0[58]|12):45)))?" />
+    <xs:pattern value="(((2000|2400|2800|(19|2[0-9](0[48]|[2468][048]|[13579][26])))-02-29)|(((19|2[0-9])[0-9]{2})-02-(0[1-9]|1[0-9]|2[0-8]))|(((19|2[0-9])[0-9]{2})-(0[13578]|10|12)-(0[1-9]|[12][0-9]|3[01]))|(((19|2[0-9])[0-9]{2})-(0[469]|11)-(0[1-9]|[12][0-9]|30)))T(2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9])(\.[0-9]+)?(Z|(-((0[0-9]|1[0-2]):00|0[39]:30)|\+((0[0-9]|1[0-4]):00|(0[34569]|10):30|(0[58]|12):45)))?" />
   </xs:restriction>
 </xs:simpleType>
 ```
@@ -233,7 +234,7 @@ In JSON Schema, this is represented as:
 ```JSON
 {
   "type": "string",
-  "pattern": "^(((2000|2400|2800|(19|2[0-9](0[48]|[2468][048]|[13579][26])))-02-29)|(((19|2[0-9])[0-9]{2})-02-(0[1-9]|1[0-9]|2[0-8]))|(((19|2[0-9])[0-9]{2})-(0[13578]|10|12)-(0[1-9]|[12][0-9]|3[01]))|(((19|2[0-9])[0-9]{2})-(0[469]|11)-(0[1-9]|[12][0-9]|30)))T(2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9])(\\.[0-9]*[1-9])?(Z|(-((0[0-9]|1[0-2]):00|0[39]:30)|\\+((0[0-9]|1[0-4]):00|(0[34569]|10):30|(0[58]|12):45)))?$"
+  "pattern": "^(((2000|2400|2800|(19|2[0-9](0[48]|[2468][048]|[13579][26])))-02-29)|(((19|2[0-9])[0-9]{2})-02-(0[1-9]|1[0-9]|2[0-8]))|(((19|2[0-9])[0-9]{2})-(0[13578]|10|12)-(0[1-9]|[12][0-9]|3[01]))|(((19|2[0-9])[0-9]{2})-(0[469]|11)-(0[1-9]|[12][0-9]|30)))T(2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9])(\\.[0-9]+)?(Z|(-((0[0-9]|1[0-2]):00|0[39]:30)|\\+((0[0-9]|1[0-4]):00|(0[34569]|10):30|(0[58]|12):45)))?$"
 }
 ```
 
@@ -247,8 +248,9 @@ For example:
 
 ```
 2019-09-28T23:20:50.52Z
+2019-09-28T23:20:50.520Z
 2019-12-02T16:39:57-08:00
-2019-12-31T23:59:60Z
+2019-12-31T23:59:59Z
 ```
 
 In XML Schema this is represented as a restriction on the built in type [dateTime](https://www.w3.org/TR/xmlschema11-2/#dateTime) as follows:
@@ -256,7 +258,7 @@ In XML Schema this is represented as a restriction on the built in type [dateTim
 ```XML
 <xs:simpleType name="DateWithTimezoneDatatype">
   <xs:restriction base="DateDatatype">
-    <xs:pattern value="(((2000|2400|2800|(19|2[0-9](0[48]|[2468][048]|[13579][26])))-02-29)|(((19|2[0-9])[0-9]{2})-02-(0[1-9]|1[0-9]|2[0-8]))|(((19|2[0-9])[0-9]{2})-(0[13578]|10|12)-(0[1-9]|[12][0-9]|3[01]))|(((19|2[0-9])[0-9]{2})-(0[469]|11)-(0[1-9]|[12][0-9]|30)))T(2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9])(\.[0-9]*[1-9])?(Z|(-((0[0-9]|1[0-2]):00|0[39]:30)|\+((0[0-9]|1[0-4]):00|(0[34569]|10):30|(0[58]|12):45)))" />
+    <xs:pattern value="(((2000|2400|2800|(19|2[0-9](0[48]|[2468][048]|[13579][26])))-02-29)|(((19|2[0-9])[0-9]{2})-02-(0[1-9]|1[0-9]|2[0-8]))|(((19|2[0-9])[0-9]{2})-(0[13578]|10|12)-(0[1-9]|[12][0-9]|3[01]))|(((19|2[0-9])[0-9]{2})-(0[469]|11)-(0[1-9]|[12][0-9]|30)))T(2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9])(\.[0-9]+)?(Z|(-((0[0-9]|1[0-2]):00|0[39]:30)|\+((0[0-9]|1[0-4]):00|(0[34569]|10):30|(0[58]|12):45)))" />
   </xs:restriction>
 </xs:simpleType>
 ```
@@ -267,7 +269,7 @@ In JSON Schema, this is represented as:
 {
   "type": "string",
   "format": "date-time",
-  "pattern": "^(((2000|2400|2800|(19|2[0-9](0[48]|[2468][048]|[13579][26])))-02-29)|(((19|2[0-9])[0-9]{2})-02-(0[1-9]|1[0-9]|2[0-8]))|(((19|2[0-9])[0-9]{2})-(0[13578]|10|12)-(0[1-9]|[12][0-9]|3[01]))|(((19|2[0-9])[0-9]{2})-(0[469]|11)-(0[1-9]|[12][0-9]|30)))T(2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9])(\\.[0-9]*[1-9])?(Z|(-((0[0-9]|1[0-2]):00|0[39]:30)|\\+((0[0-9]|1[0-4]):00|(0[34569]|10):30|(0[58]|12):45)))$"
+  "pattern": "^(((2000|2400|2800|(19|2[0-9](0[48]|[2468][048]|[13579][26])))-02-29)|(((19|2[0-9])[0-9]{2})-02-(0[1-9]|1[0-9]|2[0-8]))|(((19|2[0-9])[0-9]{2})-(0[13578]|10|12)-(0[1-9]|[12][0-9]|3[01]))|(((19|2[0-9])[0-9]{2})-(0[469]|11)-(0[1-9]|[12][0-9]|30)))T(2[0-3]|[01][0-9]):([0-5][0-9]):([0-5][0-9])(\\.[0-9]+)?(Z|(-((0[0-9]|1[0-2]):00|0[39]:30)|\\+((0[0-9]|1[0-4]):00|(0[34569]|10):30|(0[58]|12):45)))$"
 }
 ```