Inject live datetime into system prompt per invocation with relative-time instruction

agentclaw/app/agent_claw_main/prompt_builder.py

@@ -1,5 +1,7 @@
 import os
 import boto3
+from datetime import datetime
+from zoneinfo import ZoneInfo
 from botocore.exceptions import ClientError
 
 # Cache keyed by actor_id ('' = global/no user)
@@ -9,9 +11,24 @@ _prompt_cache: dict[str, str] = {}
 def build_system_prompt(user_context: str = '', actor_id: str = '') -> str:
     """Build system prompt from S3 workspace files + optional per-user context."""
     base = _get_base_prompt(actor_id)
+
+    # Dynamic block — injected fresh every call, never cached
+    chicago = ZoneInfo('America/Chicago')
+    now = datetime.now(chicago)
+    dt_str = now.strftime('%A %Y-%m-%d %H:%M:%S %Z')
+    time_block = (
+        f'## Current Time\n'
+        f'The current date and time is: {dt_str}\n\n'
+        f'When examining any other date or time value, calculate its distance from now '
+        f'(in seconds, minutes, hours, or days as appropriate) before drawing conclusions '
+        f'like "upcoming", "overdue", "recent", "just happened", or "a long time ago". '
+        f'Do this arithmetic explicitly — do not estimate or assume.'
+    )
+
+    parts = [base, time_block]
     if user_context:
-        return base + f'\n\n---\n\n## User\n{user_context}'
-    return base
+        parts.append(f'## User\n{user_context}')
+    return '\n\n---\n\n'.join(parts)
 
 
 def _get_base_prompt(actor_id: str = '') -> str:
@@ -58,7 +75,7 @@ def _get_base_prompt(actor_id: str = '') -> str:
         except Exception as e:
             print(f'[prompt_builder] Failed to load {fname}: {e}')
 
-    parts.append('## Runtime\nRuntime: agent-claw | host=AgentCore | model=bedrock-claude-sonnet | channel=telegram\nCurrent date/time is provided by the system. Timezone: America/Chicago.')
+    parts.append('## Runtime\nRuntime: agent-claw | host=AgentCore | model=bedrock-claude-sonnet | channel=telegram | timezone=America/Chicago')
 
     result = '\n\n---\n\n'.join(parts)
     _prompt_cache[actor_id] = result