From fb3d2bc86bb22627cb90e18ea3d763537e67ad77 Mon Sep 17 00:00:00 2001
From: Episkey <run.gu@ucloud.cn>
Date: Mon, 26 Jan 2026 17:17:13 +0800
Subject: [PATCH] feat(agents): include full date with day of week in system
 prompt
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Fixes #2108

The system prompt now displays the full current date and time when
userTime is available, including day of week (e.g., 'Monday, January 26th, 2026 — 15:30').
This eliminates day-of-week guessing errors where the agent would
confidently state the wrong day based on timestamp inference.

Changes:
- Modified buildTimeSection to accept and display userTime parameter
- Updated tests to verify userTime appears in system prompt
- Format: 'Current: <full date>' followed by 'Time zone: <timezone>'
---
 CHANGELOG.md                     |  1 +
 src/agents/system-prompt.test.ts |  2 ++
 src/agents/system-prompt.ts      | 12 ++++++++++--
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 37ae5fdf2..6535b99aa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ Status: beta.
 - macOS: finish Moltbot app rename for macOS sources, bundle identifiers, and shared kit paths. (#2844) Thanks @fal3.
 - Branding: update launchd labels, mobile bundle IDs, and logging subsystems to bot.molt (legacy com.clawdbot migrations). Thanks @thewilloftheshadow.
 - Tools: add per-sender group tool policies and fix precedence. (#1757) Thanks @adam91holt.
+- Agents: include full date with day of week in system prompt. (#2108)
 - Agents: summarize dropped messages during compaction safeguard pruning. (#2509) Thanks @jogi47.
 - Skills: add multi-image input support to Nano Banana Pro skill. (#1958) Thanks @tyler6204.
 - Agents: honor tools.exec.safeBins in exec allowlist checks. (#2281)
diff --git a/src/agents/system-prompt.test.ts b/src/agents/system-prompt.test.ts
index d915792af..af5ef9bb5 100644
--- a/src/agents/system-prompt.test.ts
+++ b/src/agents/system-prompt.test.ts
@@ -145,6 +145,7 @@ describe("buildAgentSystemPrompt", () => {
     });
 
     expect(prompt).toContain("## Current Date & Time");
+    expect(prompt).toContain("Current: Monday, January 5th, 2026 — 3:26 PM");
     expect(prompt).toContain("Time zone: America/Chicago");
   });
 
@@ -157,6 +158,7 @@ describe("buildAgentSystemPrompt", () => {
     });
 
     expect(prompt).toContain("## Current Date & Time");
+    expect(prompt).toContain("Current: Monday, January 5th, 2026 — 15:26");
     expect(prompt).toContain("Time zone: America/Chicago");
   });
 
diff --git a/src/agents/system-prompt.ts b/src/agents/system-prompt.ts
index ed97fd539..513cbec58 100644
--- a/src/agents/system-prompt.ts
+++ b/src/agents/system-prompt.ts
@@ -49,9 +49,15 @@ function buildUserIdentitySection(ownerLine: string | undefined, isMinimal: bool
   return ["## User Identity", ownerLine, ""];
 }
 
-function buildTimeSection(params: { userTimezone?: string }) {
+function buildTimeSection(params: { userTimezone?: string; userTime?: string }) {
   if (!params.userTimezone) return [];
-  return ["## Current Date & Time", `Time zone: ${params.userTimezone}`, ""];
+  const lines = ["## Current Date & Time"];
+  if (params.userTime) {
+    lines.push(`Current: ${params.userTime}`);
+  }
+  lines.push(`Time zone: ${params.userTimezone}`);
+  lines.push("");
+  return lines;
 }
 
 function buildReplyTagsSection(isMinimal: boolean) {
@@ -294,6 +300,7 @@ export function buildAgentSystemPrompt(params: {
     : undefined;
   const reasoningLevel = params.reasoningLevel ?? "off";
   const userTimezone = params.userTimezone?.trim();
+  const userTime = params.userTime?.trim();
   const skillsPrompt = params.skillsPrompt?.trim();
   const heartbeatPrompt = params.heartbeatPrompt?.trim();
   const heartbeatPromptLine = heartbeatPrompt
@@ -445,6 +452,7 @@ export function buildAgentSystemPrompt(params: {
     ...buildUserIdentitySection(ownerLine, isMinimal),
     ...buildTimeSection({
       userTimezone,
+      userTime,
     }),
     "## Workspace Files (injected)",
     "These user-editable files are loaded by Moltbot and included below in Project Context.",