Refs #250 -- Keep payment deadlines on weekdays

src/pretix/base/services/orders.py

@@ -266,7 +266,15 @@ def _create_order(event: Event, email: str, positions: List[CartPosition], now_d
     total = sum([c.price for c in positions])
     payment_fee = payment_provider.calculate_fee(total)
     total += payment_fee
-    expires = [now_dt + timedelta(days=event.settings.get('payment_term_days', as_type=int))]
+
+    exp_by_date = now_dt + timedelta(days=event.settings.get('payment_term_days', as_type=int))
+    if event.settings.get('payment_term_weekdays'):
+        if exp_by_date.weekday() == 5:
+            exp_by_date += timedelta(days=2)
+        elif exp_by_date.weekday() == 6:
+            exp_by_date += timedelta(days=1)
+
+    expires = [exp_by_date]
     if event.settings.get('payment_term_last'):
         expires.append(event.settings.get('payment_term_last', as_type=datetime))
     order = Order.objects.create(

src/pretix/base/settings.py

@@ -53,6 +53,10 @@ DEFAULTS = {
         'default': None,
         'type': datetime,
     },
+    'payment_term_weekdays': {
+        'default': 'True',
+        'type': bool
+    },
     'payment_term_expire_automatically': {
         'default': 'True',
         'type': bool

src/pretix/control/forms/event.py

@@ -204,6 +204,13 @@ class PaymentSettingsForm(SettingsForm):
         required=False,
         widget=forms.DateTimeInput(attrs={'class': 'datetimepicker'})
     )
+    payment_term_weekdays = forms.BooleanField(
+        label=_('Only end payment terms on weekdays'),
+        help_text=_("If this is activated and the payment term of any order ends on a saturday or sunday, it will be "
+                    "moved to the next monday instead. This is required in some countries by civil law. This will "
+                    "not effect the last date of payments configured above."),
+        required=False,
+    )
     payment_term_expire_automatically = forms.BooleanField(
         label=_('Automatically expire unpaid orders'),
         help_text=_("If checked, all unpaid orders will automatically go from 'pending' to 'expired' "

src/pretix/control/templates/pretixcontrol/event/payment.html

@@ -8,6 +8,7 @@
 			<legend>{% trans "Payment settings" %}</legend>
             {% bootstrap_field sform.payment_term_days layout="horizontal" %}
             {% bootstrap_field sform.payment_term_last layout="horizontal" %}
+            {% bootstrap_field sform.payment_term_weekdays layout="horizontal" %}
             {% bootstrap_field sform.payment_term_expire_automatically layout="horizontal" %}
             {% bootstrap_field sform.payment_term_accept_late layout="horizontal" %}
             {% bootstrap_field sform.tax_rate_default layout="horizontal" %}