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-rw-r--r--example/metadata.yaml2
1 files changed, 1 insertions, 1 deletions
diff --git a/example/metadata.yaml b/example/metadata.yaml
index 8bbf980..1e83400 100644
--- a/example/metadata.yaml
+++ b/example/metadata.yaml
@@ -17,7 +17,7 @@ sample:
     collecting_institution: Institute that was responsible of sampeling
     specimen_source: http://purl.obolibrary.org/obo/NCIT_C155831
     specimen_source2: http://purl.obolibrary.org/obo/NCIT_C155835
-    collection_date: 2020-01-01
+    collection_date: "2020-01-01"
     collection_location: http://www.wikidata.org/entity/Q148
     sample_storage_conditions: XXX
     additional_collection_information: XXX