Briefer descriptions for GFS FileSets

example/aitf/ancil.py

@@ -124,8 +124,10 @@ class GFSDownloader(csppfetch.Downloader):
             urls_to_files.update(self.url_to_file_for_time(generated_time, end))
 
             expected = self.is_expected(forecast_start) and self.is_expected(end)
+            startstr = str(int(forecast_start.total_seconds()/(60*60)))
+            endstr   = str(int(           end.total_seconds()/(60*60)))
 
-            description = f"{self.name} for {generated_time} forecast {forecast_start} and {end} hours into the future"
+            description = f"{self.name} for {generated_time} forecast {startstr} and {endstr} hours into the future"
             fs = csppfetch.FileSet(urls_to_files, expected, description)
             filesets.append(fs)