diff --git a/spectrum.py b/spectrum.py
index 4f01d4d..42caafc 100755
--- a/spectrum.py
+++ b/spectrum.py
@@ -710,7 +710,7 @@ else:
     #main_hdu.header[ 'EXPTIME'  ] = head[ '' ]
     main_hdu.header[ 'RADECSYS' ] = 'FKS'
     main_hdu.header[ 'OBS-ID'   ] = head[ 'OBS_ID' ]
-    main_hdu.header['DATE-SCAN' ] = head[ 'DATE' ]
+    main_hdu.header[ 'DATE-NUM' ] = head[ 'DATE' ]
     main_hdu.header[ 'COMMENT'  ] = head[ 'COMMENT' ]
     main_hdu.header[ 'POLICY'   ] = head[ 'POLICY' ]