Update app.py

app.py

@@ -9,24 +9,21 @@ from Gradio_UI import GradioUI
 
 # Below is an example of a tool that does nothing. Amaze us with your creativity !
 @tool
-def most_common_letter(text: str, _: str) -> str:
-    """Finds the most common alphabet letter in the given text (case-insensitive).
+def days_between_dates(date1: str, date2: str) -> str:
+    """计算两个日期相差多少天 (YYYY-MM-DD).
     Args:
-        text: The input text to analyze.
-        _: Unused second argument.
+        date1: 第一个日期.
+        date2: 第二个日期.
     """
-    text = text.lower()
-    frequency = {}
-    
-    for char in text:
-        if 'a' <= char <= 'z':
-            frequency[char] = frequency.get(char, 0) + 1
-
-    if not frequency:
-        return "No alphabet letters found in the input."
-
-    most_common = max(frequency.items(), key=lambda x: x[1])
-    return f"The most common letter is '{most_common[0]}' which appears {most_common[1]} time(s)."
+    from datetime import datetime
+    fmt = "%Y-%m-%d"
+    try:
+        d1 = datetime.strptime(date1, fmt)
+        d2 = datetime.strptime(date2, fmt)
+        delta = abs((d2 - d1).days)
+        return f"There are {delta} day(s) between {date1} and {date2}."
+    except Exception as e:
+        return f"Error: {str(e)}"
 
 @tool
 def get_current_time_in_timezone(timezone: str) -> str: