diff --git a/ontobio/io/assocwriter.py b/ontobio/io/assocwriter.py
index <HASH>..<HASH> 100644
--- a/ontobio/io/assocwriter.py
+++ b/ontobio/io/assocwriter.py
@@ -171,9 +171,9 @@ class GafWriter(AssocWriter):
 
         self._write("!gaf-version: {}\n".format(self.version))
         self._write("!\n")
-        self._write("!Generated by GO Central\n")
+        self._write("!generated-by: GOC\n")
         self._write("!\n")
-        self._write("!Date Generated by GOC: {}\n".format(str(datetime.date.today())))
+        self._write("!date-generated: {}\n".format(str(datetime.datetime.now().strftime("%Y-%m-%dT%H:%M"))))
         self._write("!\n")
         # Just uses the word `source` if source is none. Otherwise uses the name of the source in the header
         self._write("!Header from {source}source association file:\n".format(source=source+" " if source else ""))
updating gaf writer to correct new header requirements in gaf <I>