feat(daily-challenge): show statistics in profile

app/utils.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+from datetime import datetime
+
 
 def unix_timestamp_to_windows(timestamp: int) -> int:
     """Convert a Unix timestamp to a Windows timestamp."""
@@ -90,3 +92,29 @@ def snake_to_pascal(name: str, use_abbr: bool = True) -> str:
             result.append(part.capitalize())
 
     return "".join(result)
+
+
+def are_adjacent_weeks(dt1: datetime, dt2: datetime) -> bool:
+    y1, w1, _ = dt1.isocalendar()
+    y2, w2, _ = dt2.isocalendar()
+
+    # 按 (年, 周) 排序，保证 dt1 <= dt2
+    if (y1, w1) > (y2, w2):
+        y1, w1, y2, w2 = y2, w2, y1, w1
+
+    # 同一年，周数相邻
+    if y1 == y2 and w2 - w1 == 1:
+        return True
+
+    # 跨年，判断 y2 是否是下一年，且 w2 == 1，并且 w1 是 y1 的最后一周
+    if y2 == y1 + 1 and w2 == 1:
+        # 判断 y1 的最后一周是多少
+        last_week_y1 = datetime(y1, 12, 28).isocalendar()[1]  # 12-28 保证在最后一周
+        if w1 == last_week_y1:
+            return True
+
+    return False
+
+
+def are_same_weeks(dt1: datetime, dt2: datetime) -> bool:
+    return dt1.isocalendar()[:2] == dt2.isocalendar()[:2]