diff --git a/knowledge base/date.md b/knowledge base/date.md
index 517704a..2f6fbae 100644
--- a/knowledge base/date.md	
+++ b/knowledge base/date.md	
@@ -12,4 +12,8 @@ date '+%Y-%m-%d'
 # Print the current date in the 'YYYY-MM-DDThh:mm:SS' format.
 date '+%FT%T'
 date '+%Y-%m-%dT%H:%M:%S'
+
+# Print a specific date in a different format.
+date -d '+10 days' '+%FT%T.00Z'  # GNU
+date -v '+10d' '+%FT%T.00Z'      # BSD
 ```