feat: Add date_format parameter and error handling to inject_date feature

Co-Authored-By: Joe Moura <joao@crewai.com>

docs/usage_examples/inject_date_example.py

@@ -7,15 +7,29 @@ agent = Agent(
     inject_date=True,  # Enable automatic date injection
 )
 
+agent_custom_format = Agent(
+    role="financial_analyst",
+    goal="Provide financial insights with proper date context",
+    backstory="You are a financial analyst who needs precise date formatting.",
+    inject_date=True,
+    date_format="%B %d, %Y",  # Format as "May 21, 2025"
+)
+
 task = Task(
     description="Research market trends and provide analysis",
     expected_output="A comprehensive report on current market trends",
     agent=agent,
 )
 
+task_custom = Task(
+    description="Analyze financial data and provide insights",
+    expected_output="A detailed financial analysis report",
+    agent=agent_custom_format,
+)
+
 crew = Crew(
-    agents=[agent],
-    tasks=[task],
+    agents=[agent, agent_custom_format],
+    tasks=[task, task_custom],
 )
 
 result = crew.kickoff()