bug fix: corrected start date after end date for overlapping "Sonstige"

1 files changed, 7 insertions, 2 deletions

diff --git a/date_calculator.py b/date_calculator.py
index 576d6a1..cec4d40 100644
--- a/date_calculator.py
+++ b/date_calculator.py
@@ -64,14 +64,14 @@ class DateCalculator:
             last_start, last_end, last_pid = adjusted[-1]
 
             if start <= last_end:
-                # Fully contained in previous period → discard
+                # Fully contained in previous period \u2192 discard
                 if end <= last_end:
                     continue
                 # Overlaps head; push start to the day after last_end
                 new_start = last_end + timedelta(days=1)
                 if new_start <= end:
                     adjusted.append((new_start, end, period_id))
-                # else new_start > end → discard
+                # else new_start > end \u2192 discard
             else:
                 adjusted.append((start, end, period_id))
 
@@ -104,6 +104,11 @@ class DateCalculator:
         return non_overlapping_periods
 
     @staticmethod
+    def filter_valid_periods(periods: List[Tuple[datetime, datetime, str]]) -> List[Tuple[datetime, datetime, str]]:
+        """Filter out periods where start date is after end date"""
+        return [(start, end, period_id) for start, end, period_id in periods if start <= end]
+
+    @staticmethod
     def calculate_total_days(periods: List[Tuple[datetime, datetime, str]]) -> int:
         """Calculate total days across all periods"""
         return sum((end - start).days + 1 for start, end, _ in periods)