fix import ADS of Paris

The CSV file sent by Paris contains a field with the attribution date,
but not the creation date.

If "type" is "Gratuite non cessible", it's a new ADS and the date should
be considered as the creation date of the ADS.

If the type is anything else, it's an old ADS, this date is the
attribution date, and we don't have the creation date of the ADS, so we
hardcode it.

mesads/app/management/commands/import_last_update_file_from_paris.py

@@ -111,22 +111,6 @@ def import_ads(self, ads_manager, all_paris_ads, row):
 
         ads.ads_in_use = True
 
-        # The CSV file sent by Paris contains a field with the attribution date,
-        # but not the creation date.
-        # For new ADS, since the ADS user is always the owner, we store the
-        # field value in ADS.ads_creation_date, and leave ADS.attribution_date
-        # empty.
-        # For old ADS, we leave ADS.ads_creation_date empty (since the CSV
-        # doesn't have the info) and we use the field value in
-        # ADS.attribution_date.
-        attribution_date = datetime.strptime(row["date_attribution"], "%Y-%m-%d").date()
-        if attribution_date < date(2014, 10, 1):
-            ads.ads_creation_date = None
-            ads.attribution_date = attribution_date
-        else:
-            ads.ads_creation_date = attribution_date
-            ads.attribution_date = None
-
         if row["type_ads"] not in (
             "Payante",
             "Relais",
@@ -138,6 +122,22 @@ def import_ads(self, ads_manager, all_paris_ads, row):
                 f'ADS {row["numero_ads"]}: invalid type_ads "{row["type_ads"]}"'
             )
 
+        # The CSV file sent by Paris contains a field with the attribution date,
+        # but not the creation date.
+        # If "type" is "Gratuite non cessible", it's a new ADS and the date
+        # should be considered as the creation date of the ADS.
+        # If the type is anything else, it's an old ADS, this date is the
+        # attribution date, and we don't have the creation date of the ADS, so
+        # we hardcode it.
+        attribution_date = datetime.strptime(row["date_attribution"], "%Y-%m-%d").date()
+
+        if row["type_ads"] == "Gratuite non cessible":
+            ads.ads_creation_date = attribution_date
+            ads.attribution_date = None
+        else:
+            ads.ads_creation_date = date.min  # equals datetime.date(1, 1, 1)
+            ads.attribution_date = attribution_date
+
         if row["type_ads"] == "PMR":
             ads.vehicle_compatible_pmr = True
         else: