date format fix

app/core/deep_agent.py

@@ -55,6 +55,42 @@ def _language_instruction(context: dict[str, Any]) -> str:
         f"All your output text must be written in {lang}."
     )
 
+def _datetime_context_injection(context: dict[str, Any]) -> str:
+    """Build a system-prompt paragraph with current timestamp, user timezone, and format prefs."""
+    fp = context.get("format_prefs")
+    if not fp or not isinstance(fp, dict):
+        return ""
+    try:
+        from zoneinfo import ZoneInfo
+        from datetime import datetime as _dt, timezone as _utc
+        tz_name: str = str(fp.get("timezone") or "UTC")
+        now_iso: str = str(fp.get("now_iso") or "")
+        date_fmt: str = str(fp.get("date_format") or "dd/MM/yyyy")
+        time_fmt: str = str(fp.get("time_format") or "24h")
+
+        if now_iso:
+            now_utc = _dt.fromisoformat(now_iso.replace("Z", "+00:00"))
+        else:
+            now_utc = _dt.now(_utc.utc)
+
+        tz = ZoneInfo(tz_name)
+        now_local = now_utc.astimezone(tz)
+        today_local = now_local.strftime("%Y-%m-%d")
+        weekday_local = now_local.strftime("%A")
+
+        return (
+            f"\n\nCurrent instant: {now_utc.isoformat()}. "
+            f"User local date: {today_local} ({weekday_local}). "
+            f"Timezone: {tz_name}. "
+            f"Display preference: dateFormat={date_fmt}, timeFormat={time_fmt}. "
+            f"When calling tools with date fields, always pass integer Unix milliseconds (ms since epoch, UTC). "
+            f"When calling list_tasks_due_today or list_timelines_today, always pass user_timezone=\"{tz_name}\". "
+            f"When presenting dates to the user in chat, format using the display preference above."
+        )
+    except Exception:
+        return ""
+
+
 def _proactive_hints_injection(context: dict[str, Any]) -> str:
     """Return a system-prompt paragraph listing proactive behavioral hints.
 
@@ -938,6 +974,7 @@ async def run_home(user_id: str, message: str, context: dict[str, Any]) -> str:
     )
     system_prompt += _relational_memory_injection(context)
     system_prompt += _proactive_hints_injection(context)
+    system_prompt += _datetime_context_injection(context)
     system_prompt += _language_instruction(context)
     response = await _run_single_agent(
         user_id=user_id,
@@ -958,6 +995,7 @@ async def run_floating(user_id: str, message: str, context: dict[str, Any]) -> t
     )
     system_prompt += _relational_memory_injection(context)
     system_prompt += _proactive_hints_injection(context)
+    system_prompt += _datetime_context_injection(context)
     system_prompt += _language_instruction(context)
     response = await _run_single_agent(
         user_id=user_id,
@@ -984,6 +1022,7 @@ async def run_home_stream(
     )
     system_prompt += _relational_memory_injection(context)
     system_prompt += _proactive_hints_injection(context)
+    system_prompt += _datetime_context_injection(context)
     system_prompt += _language_instruction(context)
     text_chunks: list[str] = []
     async for event in _run_single_agent_stream(
@@ -1019,6 +1058,7 @@ async def run_floating_stream(
     )
     system_prompt += _relational_memory_injection(context)
     system_prompt += _proactive_hints_injection(context)
+    system_prompt += _datetime_context_injection(context)
     system_prompt += _language_instruction(context)
     sanitizer = _FloatingStreamSanitizer()
     emitted_sanitized = False