Sort gallery media by capture date instead of file name

photologue/forms.py

@@ -43,6 +43,9 @@ class MultipleFileField(forms.FileField):
 
 class UploadForm(forms.Form):
     file_field = MultipleFileField(label="")
+    # File.lastModified, in milliseconds, sent by upload.js. An upload is the last
+    # chance to catch it: the date of the file itself does not survive HTTP.
+    file_modified = forms.IntegerField(required=False, widget=forms.HiddenInput)
     gallery = forms.ModelChoiceField(
         Gallery.objects.all(),
         label=_("Gallery"),