diff --git a/src/octopal/runtime/temporal_context.py b/src/octopal/runtime/temporal_context.py
new file mode 100644
index 0000000..e7fb14a
--- /dev/null
+++ b/src/octopal/runtime/temporal_context.py
@@ -0,0 +1,45 @@
+from __future__ import annotations
+
+from collections.abc import Mapping
+from datetime import UTC, datetime
+from typing import Any
+
+from octopal.utils import utc_now
+
+
+def build_temporal_context(now: datetime | None = None) -> dict[str, Any]:
+    utc_dt = now or utc_now()
+    if utc_dt.tzinfo is None:
+        utc_dt = utc_dt.replace(tzinfo=UTC)
+    utc_dt = utc_dt.astimezone(UTC)
+    local_dt = utc_dt.astimezone()
+    timezone_name = local_dt.tzname() or local_dt.strftime("%z") or "local"
+    return {
+        "current_date": local_dt.date().isoformat(),
+        "current_time": local_dt.strftime("%H:%M:%S"),
+        "current_datetime": local_dt.isoformat(),
+        "current_weekday": local_dt.strftime("%A"),
+        "local_date": local_dt.date().isoformat(),
+        "local_time": local_dt.strftime("%H:%M:%S"),
+        "local_datetime": local_dt.isoformat(),
+        "local_weekday": local_dt.strftime("%A"),
+        "local_timezone": timezone_name,
+        "utc_date": utc_dt.date().isoformat(),
+        "utc_time": utc_dt.strftime("%H:%M:%S"),
+        "utc_datetime": utc_dt.isoformat(),
+        "utc_weekday": utc_dt.strftime("%A"),
+    }
+
+
+def format_temporal_context_prompt(context: Mapping[str, Any] | None = None) -> str:
+    ctx = dict(context or build_temporal_context())
+    return (
+        "Temporal context:\n"
+        f"- Current local date: {ctx['local_date']} ({ctx['local_weekday']})\n"
+        f"- Current local time: {ctx['local_time']} ({ctx['local_timezone']})\n"
+        f"- Current local datetime: {ctx['local_datetime']}\n"
+        f"- Current UTC datetime: {ctx['utc_datetime']}\n"
+        "- Treat relative dates like today, yesterday, tomorrow, this morning, and this "
+        "week relative to this context unless the task gives a more specific date."
+    )
+
diff --git a/src/octopal/runtime/workers/agent_worker.py b/src/octopal/runtime/workers/agent_worker.py
index 57b0466..e5f5060 100644
--- a/src/octopal/runtime/workers/agent_worker.py
+++ b/src/octopal/runtime/workers/agent_worker.py
@@ -24,6 +24,7 @@
 
 from octopal.infrastructure.config.settings import load_settings
 from octopal.infrastructure.providers.litellm_provider import LiteLLMProvider
+from octopal.runtime.temporal_context import format_temporal_context_prompt
 from octopal.runtime.tool_errors import ToolBridgeError
 from octopal.runtime.tool_loop import (
     _detect_tool_loop,
@@ -699,8 +700,12 @@ async def mcp_proxy_handler(args: dict, ctx: dict, s_id=s_id, t_name=t_name):
         has_child_spawn_tools=has_child_spawn_tools
     )
 
+    temporal_context_prompt = format_temporal_context_prompt()
+
     system_prompt = f"""{spec.system_prompt}
 
+{temporal_context_prompt}
+
 Available tools:
 {tool_descriptions}
 
diff --git a/tests/test_agent_loop_improvements.py b/tests/test_agent_loop_improvements.py
index da23c2e..08ae114 100644
--- a/tests/test_agent_loop_improvements.py
+++ b/tests/test_agent_loop_improvements.py
@@ -846,6 +846,8 @@ async def _fake_call_llm(provider, messages, tools):
         assert "request_instruction" in tool_names
         assert "answer_worker_instruction" not in tool_names
         system_prompt = str(messages[0]["content"])
+        assert "Temporal context:" in system_prompt
+        assert "Current local date:" in system_prompt
         assert "Worker coordination:" in system_prompt
         assert "Parent-worker coordination:" not in system_prompt
         assert "normal tool calls" in system_prompt
diff --git a/tests/test_temporal_context.py b/tests/test_temporal_context.py
new file mode 100644
index 0000000..b6a3a99
--- /dev/null
+++ b/tests/test_temporal_context.py
@@ -0,0 +1,24 @@
+from __future__ import annotations
+
+from octopal.runtime.temporal_context import format_temporal_context_prompt
+
+_CONTEXT = {
+    "local_date": "2026-05-15",
+    "local_time": "09:30:00",
+    "local_datetime": "2026-05-15T09:30:00+00:00",
+    "local_weekday": "Friday",
+    "local_timezone": "UTC",
+    "utc_date": "2026-05-15",
+    "utc_time": "09:30:00",
+    "utc_datetime": "2026-05-15T09:30:00+00:00",
+    "utc_weekday": "Friday",
+}
+
+
+def test_temporal_context_formats_worker_prompt() -> None:
+    prompt = format_temporal_context_prompt(_CONTEXT)
+
+    assert "Temporal context:" in prompt
+    assert "Current local date: 2026-05-15" in prompt
+    assert "Current UTC datetime: 2026-05-15T09:30:00+00:00" in prompt
+    assert "relative dates" in prompt