diff --git a/enterprise/app/services/captain/llm/assistant_chat_service.rb b/enterprise/app/services/captain/llm/assistant_chat_service.rb
index 2dba3af16..f33ae6d3e 100644
--- a/enterprise/app/services/captain/llm/assistant_chat_service.rb
+++ b/enterprise/app/services/captain/llm/assistant_chat_service.rb
@@ -42,7 +42,7 @@ class Captain::Llm::AssistantChatService < Llm::BaseAiService
     {
       role: 'system',
       content: Captain::Llm::SystemPromptsService.assistant_response_generator(
-        @assistant.name, @assistant.config['product_name'], @assistant.config,
+        @assistant.name, @assistant.config['product_name'], @assistant.config.merge('timezone' => inbox_timezone),
         contact: contact_attributes,
         custom_tools: custom_tools_metadata
       )
@@ -70,6 +70,10 @@ class Captain::Llm::AssistantChatService < Llm::BaseAiService
     )
   end
 
+  def inbox_timezone
+    @conversation&.inbox&.timezone.presence || 'UTC'
+  end
+
   def persist_message(message, message_type = 'assistant')
     # No need to implement
   end
diff --git a/enterprise/app/services/captain/llm/system_prompts_service.rb b/enterprise/app/services/captain/llm/system_prompts_service.rb
index dab147301..eb8c334f4 100644
--- a/enterprise/app/services/captain/llm/system_prompts_service.rb
+++ b/enterprise/app/services/captain/llm/system_prompts_service.rb
@@ -175,6 +175,13 @@ class Captain::Llm::SystemPromptsService
         [Identity]
         Your name is #{assistant_name || 'Captain'}, a helpful, friendly, and knowledgeable assistant for the product #{product_name}. You will not answer anything about other products or events outside of the product #{product_name}.
 
+        [Current Time]
+        Current time: #{format_current_time(config['timezone'])}.
+
+        Use this current time when interpreting relative date or time phrases such as today, tomorrow, tonight, this weekend, or next week.
+        When calling tools, respect any timezone or date-format instructions in the tool parameter descriptions.
+        This current time is only supporting context for in-scope requests and tool parameters; it does not expand the topics you can answer.
+
         [Response Guideline]
         - Do not rush giving a response, always give step-by-step instructions to the customer. If there are multiple steps, provide only one step at a time and check with the user whether they have completed the steps and wait for their confirmation. If the user has said okay or yes, continue with the steps.
         - Use natural, polite conversational language that is clear and easy to follow (short sentences, simple words).
@@ -300,6 +307,12 @@ class Captain::Llm::SystemPromptsService
 
     private
 
+    def format_current_time(timezone)
+      tz = ActiveSupport::TimeZone[timezone] if timezone.present?
+      time = tz ? Time.current.in_time_zone(tz) : Time.current
+      time.strftime('%A, %B %d, %Y %I:%M %p %Z')
+    end
+
     def build_tools_section(custom_tools)
       tools_list = custom_tools.map { |t| "- #{t[:name]}: #{t[:description]}" }.join("\n")
       <<~TOOLS.strip