Update app.py

Added new tool called calculate_time_difference that calculates the time difference between two time, either in units of seconds, minutes or hours, as defined by the user.

app.py

@@ -18,6 +18,36 @@ def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return
     """
     return "What magic will you build ?"
 
+@tool
+def calculate_time_difference(localtime1:str, localtime2:str, timeunit:str)-> str: 
+    """A tool that calculates the time difference between two times using a given 
+    timeunit (seconds, minutes, hours) 
+    Args:
+        localtime1: local time in one timezone (format: %Y-%m-%d %H:%M:%S)
+        localtime2: local time in another timezone (format: %Y-%m-%d %H:%M:%S)
+        timeunit: time units, either seconds, minutes or hours
+    """
+    try:
+        start = datetime.datetime.strptime(localtime1, '%Y-%m-%d %H:%M:%S')
+        end = datetime.datetime.strptime(localtime2, '%Y-%m-%d %H:%M:%S')
+        difference = end - start
+
+        match timeunit:
+            case "seconds":
+                timediff = abs(difference.total_seconds())
+
+            case "minutes":
+                timediff = abs(difference.total_seconds()/60.0)
+
+            case "hours":
+                timediff = abs(difference.total_seconds()/60.0/60.0)
+
+        output_str = f"The time difference is {timediff} {timeunit}."
+
+    except Exception as e:
+        output_str =  f"Error calculating the time difference': {str(e)}"
+    return output_str
+
 @tool
 def get_current_time_in_timezone(timezone: str) -> str:
     """A tool that fetches the current local time in a specified timezone.