Add strftime_now function into Jinja2ChatFormatter Class for gpt-oss and gemma3 chat_template need

Author: JamePeng

llama_cpp/llama_chat_format.py

@@ -5,6 +5,7 @@
 import json
 import ctypes
 import dataclasses
+import datetime
 import random
 import string
 
@@ -60,6 +61,11 @@
 LLAMA4_INSTRUCT_BOS_TOKEN = "<|begin_of_text|>"
 LLAMA4_INSTRUCT_EOS_TOKEN = "<|eot|>"
 
+# Source: https://huggingface.co/openai/gpt-oss-20b/blob/main/tokenizer_config.json
+GPT_OSS_BOS_TOKEN = "<|startoftext|>"
+GPT_OSS_EOS_TOKEN = "<|return|>"
+GPT_OSS_PAD_TOKEN = "<|endoftext|>"
+
 ### Chat Completion Handler ###
 
 
@@ -240,11 +246,18 @@ def __call__(
         def raise_exception(message: str):
             raise ValueError(message)
 
+        def strftime_now(format_string="%Y-%m-%d %H:%M:%S"):
+            """
+            Returns the current time formatted as a string.
+            """
+            return datetime.datetime.now().strftime(format_string)
+
         prompt = self._environment.render(
             messages=messages,
             eos_token=self.eos_token,
             bos_token=self.bos_token,
             raise_exception=raise_exception,
+            strftime_now=strftime_now,
             add_generation_prompt=self.add_generation_prompt,
             functions=functions,
             function_call=function_call,