Try setting gregorian to False in save_ancil

Author: penguian

CMIP7/esm1p6/atmosphere/amip/cmip7_AM_amip_generate.py

@@ -40,7 +40,13 @@ def esm_am_amip_save_dirpath(args):
 def save_cmip7_am_amip(args, cube):
     # Save as an ancillary file
     save_dirpath = esm_am_amip_save_dirpath(args)
-    save_ancil(cube, save_dirpath, args.save_filename, replace_bounds=True)
+    save_ancil(
+        cube,
+        save_dirpath,
+        args.save_filename,
+        gregorian=False,
+        replace_bounds=True
+    )
 
 
 if __name__ == "__main__":