diff --git a/reference/datetime/formats.xml b/reference/datetime/formats.xml
index 75d90c7b35..7708468679 100644
--- a/reference/datetime/formats.xml
+++ b/reference/datetime/formats.xml
@@ -455,7 +455,7 @@
      </row>
      <row>
       <entry><literal>doy</literal></entry>
-      <entry>"0"[1-9][0-9] | [1-2][0-9][0-9] | "3"[0-5][0-9] | "36"[0-6]</entry>
+      <entry>"00"[1-9] | "0"[1-9][0-9] | [1-2][0-9][0-9] | "3"[0-5][0-9] | "36"[0-6]</entry>
       <entry>"36"[0-6] "000", "012", "366"</entry>
      </row>
      <row>