diff --git a/pygeometa/schemas/ogcapi_records/__init__.py b/pygeometa/schemas/ogcapi_records/__init__.py
index 51f6f32..a5d3fce 100644
--- a/pygeometa/schemas/ogcapi_records/__init__.py
+++ b/pygeometa/schemas/ogcapi_records/__init__.py
@@ -422,23 +422,31 @@ def generate_date(self, date_value: str) -> str:
         print("VALUE", type(date_value))
         value = None
 
-        if isinstance(date_value, (date, datetime)):
-            value = date_value.strftime('%Y-%m-%dT%H:%M:%SZ')
-
-        elif date_value in [None, 'None']:
-            value = datetime.now().strftime('%Y-%m-%dT%H:%M:%SZ')
-        else:
-            value = str(date_value)
-
-        if isinstance(value, str):
-            if len(value) == 10:  # YYYY-MM-DD
+        if isinstance(date_value, str) and date_value != 'None':
+            if len(date_value) == 10:  # YYYY-MM-DD
                 format_ = '%Y-%m-%d'
-            elif len(value) == 7:  # YYYY-MM
+            elif len(date_value) == 7:  # YYYY-MM
                 format_ = '%Y-%m'
-            elif len(value) == 4:  # YYYY
+            elif len(date_value) == 4:  # YYYY
                 format_ = '%Y'
 
             LOGGER.debug('date type found; expanding to date-time')
-            value = datetime.strptime(value, format_).strftime('%Y-%m-%dT%H:%M:%SZ')  # noqa
+            value = datetime.strptime(date_value, format_).strftime('%Y-%m-%dT%H:%M:%SZ')  # noqa
+
+        elif isinstance(date_value, int) and len(str(date_value)) == 4:
+            date_value2 = str(date_value)
+            LOGGER.debug('date type found; expanding to date-time')
+            format_ = '%Y'
+            value = datetime.strptime(date_value2, format_).strftime('%Y-%m-%dT%H:%M:%SZ')  # noqa
+
+        elif isinstance(date_value, (date, datetime)):
+            value = date_value.strftime('%Y-%m-%dT%H:%M:%SZ')
+
+        elif date_value in [None, 'None']:
+            value = datetime.now().strftime('%Y-%m-%dT%H:%M:%SZ')
+
+        else:
+            msg = f'Unknown date string: {date_value}'
+            raise RuntimeError(msg)
 
         return value