diff --git a/accountant/api/models/scheduled_operations.py b/accountant/api/models/scheduled_operations.py
index 4819864..a1db35e 100644
--- a/accountant/api/models/scheduled_operations.py
+++ b/accountant/api/models/scheduled_operations.py
@@ -81,31 +81,42 @@ class ScheduledOperation(db.Model):
         ).delete()
 
         # 2) schedule remaining operations.
+        # Find the first date to have all dates in the range with the right day.
         start_date = arrow.get(self.start_date)
+        day = min(self.day, monthrange(start_date.year, start_date.month)[1])
+
+        # First date is in the next month is below the start date day.
+        if day < start_date.day:
+            start_date = start_date.replace(months=+1)
+        start_date = start_date.replace(day=day)
+
+        # Stop date remains the same.
         stop_date = arrow.get(self.stop_date)
 
-        for r in arrow.Arrow.range(
+        # Iterate over the range.
+        for c_date in arrow.Arrow.range(
             "month", start_date, stop_date
         )[::self.frequency]:
-            current_monthrange = monthrange(r.year, r.month)
+            # If a date day is below the first date day, next dates will not
+            # have the right day.
+            day = min(self.day, monthrange(
+                c_date.year, c_date.month)[1])
 
-            day = max(self.day, current_monthrange[0])
-            day = min(self.day, current_monthrange[1])
-
-            r.replace(day=day)
+            c_date = c_date.replace(day=day)
 
             # Search if a close operation exists.
+
             if not session.query(
                 Operation
             ).filter(
                 Operation.account_id == self.account_id,
                 Operation.scheduled_operation_id == self.id,
-                Operation.operation_date >= r.clone().replace(weeks=-2).date(),
-                Operation.operation_date <= r.clone().replace(weeks=+2).date()
+                Operation.operation_date >= c_date.replace(weeks=-2).date(),
+                Operation.operation_date <= c_date.replace(weeks=+2).date()
             ).count():
                 # Create not confirmed operation if not found.
                 operation = Operation(
-                    operation_date=r.date(),
+                    operation_date=c_date.date(),
                     label=self.label,
                     value=self.value,
                     category=self.category,