fix: chat time bug

src/memos/mem_os/product.py

@@ -365,6 +365,8 @@ def _build_system_prompt(
 
         # Build base prompt
         # Add memory context if available
+        now = datetime.now()
+        formatted_date = now.strftime("%Y-%m-%d (%A)")
         if memories_all:
             memory_context = "\n\n## Available ID Memories:\n"
             for i, memory in enumerate(memories_all, 1):
@@ -373,16 +375,18 @@ def _build_system_prompt(
                 memory_content = memory.memory[:500] if hasattr(memory, "memory") else str(memory)
                 memory_content = memory_content.replace("\n", " ")
                 memory_context += f"{memory_id}: {memory_content}\n"
-            return MEMOS_PRODUCT_BASE_PROMPT + memory_context
+            return MEMOS_PRODUCT_BASE_PROMPT.format(formatted_date) + memory_context
 
-        return MEMOS_PRODUCT_BASE_PROMPT
+        return MEMOS_PRODUCT_BASE_PROMPT.format(formatted_date)
 
     def _build_enhance_system_prompt(
         self, user_id: str, memories_all: list[TextualMemoryItem]
     ) -> str:
         """
         Build enhance prompt for the user with memory references.
         """
+        now = datetime.now()
+        formatted_date = now.strftime("%Y-%m-%d (%A)")
         if memories_all:
             personal_memory_context = "\n\n## Available ID and PersonalMemory Memories:\n"
             outer_memory_context = "\n\n## Available ID and OuterMemory Memories:\n"
@@ -405,8 +409,12 @@ def _build_enhance_system_prompt(
                     )
                     memory_content = memory_content.replace("\n", " ")
                     outer_memory_context += f"{memory_id}: {memory_content}\n"
-            return MEMOS_PRODUCT_ENHANCE_PROMPT + personal_memory_context + outer_memory_context
-        return MEMOS_PRODUCT_ENHANCE_PROMPT
+            return (
+                MEMOS_PRODUCT_ENHANCE_PROMPT.format(formatted_date)
+                + personal_memory_context
+                + outer_memory_context
+            )
+        return MEMOS_PRODUCT_ENHANCE_PROMPT.format(formatted_date)
 
     def _extract_references_from_response(self, response: str) -> tuple[str, list[dict]]:
         """

src/memos/templates/mos_prompts.py

@@ -1,9 +1,3 @@
-from datetime import datetime
-
-
-now = datetime.now()
-formatted_date = now.strftime("%Y-%m-%d (%A)")
-
 COT_DECOMPOSE_PROMPT = """
 I am an 8-year-old student who needs help analyzing and breaking down complex questions. Your task is to help me understand whether a question is complex enough to be broken down into smaller parts.
 
@@ -72,7 +66,7 @@
     "You are MemOS🧚, nickname Little M(小忆🧚) — an advanced **Memory "
     "Operating System** AI assistant created by MemTensor, "
     "a Shanghai-based AI research company advised by an academician of the Chinese Academy of Sciences. "
-    f"Today's date is: {formatted_date}.\n"
+    "Today's date is: {}.\n"
     "MemTensor is dedicated to the vision of 'low cost, low hallucination, high generalization,' "
     "exploring AI development paths aligned with China’s national context and driving the adoption of trustworthy AI technologies. "
     "MemOS’s mission is to give large language models (LLMs) and autonomous agents **human-like long-term memory**, "
@@ -99,12 +93,12 @@
     "and ensure your responses are **natural and conversational**, while reflecting MemOS’s mission, memory system, and MemTensor’s research values."
 )
 
-MEMOS_PRODUCT_ENHANCE_PROMPT = f"""
+MEMOS_PRODUCT_ENHANCE_PROMPT = """
 # Memory-Enhanced AI Assistant Prompt
 
 You are MemOS🧚, nickname Little M(小忆🧚) — an advanced Memory Operating System
 AI assistant created by MemTensor, a Shanghai-based AI research company advised by an academician of the Chinese Academy of Sciences.
-Today's date: {formatted_date}.
+Today's date: {}.
 MemTensor is dedicated to the vision of
 'low cost, low hallucination, high generalization,' exploring AI development paths aligned with China’s national context and driving the adoption of trustworthy AI technologies.