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turn-tail date fragment uses UTC, off-by-one near local midnight #538

Closed
#540
Closed
turn-tail date fragment uses UTC, off-by-one near local midnight#538
#540

Description

@Astro-Han
Astro-Han
opened on Jul 5, 2026

Problem

formatDate in packages/runtime/src/system-prompt/session-environment-prompt.ts builds "Today's date" with new Date(now).toISOString().slice(0,10) (UTC). Near local midnight (UTC+8 00:30 = UTC 16:30 previous day) the injected date is one day behind local "today", which can mislead date-sensitive answers.

Scope

Shared fragment — both desktop and CLI TUI turn-tail use buildSessionEnvironmentPromptFragment, so both are affected. Desktop tests currently pin UTC dates (now: '2026-05-29T12:34:56Z' → 2026-05-29).

Repro

now = 2026-05-29T16:30:00Z, TZ UTC+8 → local 2026-05-30 00:30, but formatDate returns 2026-05-29.

Options

  • A: switch formatDate to local timezone, keep "Today's date"
  • B: remove date injection
  • C: pass UTC ISO + local timezone name, explicit semantics

Verification

Fixed-now test crossing UTC midnight (2026-05-29T16:30:00Z in UTC+8 = local 2026-05-30).

Context

Spun out of PR #531 review (P2, non-blocking). #531 ships CLI system-prompt injection; this is the shared date-fragment timezone semantics, deferred to keep #531 scoped.

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try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
turn-tail date fragment uses UTC, off-by-one near local midnight · Issue #538 · apache/maka · GitHub
      Skip to content
      turn-tail date fragment uses UTC, off-by-one near local midnight #538
      Closed
      #540
      Closed
      turn-tail date fragment uses UTC, off-by-one near local midnight#538
      #540
      Description
      @Astro-Han
      Astro-Han
      opened on Jul 5, 2026
      Problem
      formatDate in packages/runtime/src/system-prompt/session-environment-prompt.ts builds "Today's date" with new Date(now).toISOString().slice(0,10) (UTC). Near local midnight (UTC+8 00:30 = UTC 16:30 previous day) the injected date is one day behind local "today", which can mislead date-sensitive answers.
      Scope
      Shared fragment — both desktop and CLI TUI turn-tail use buildSessionEnvironmentPromptFragment, so both are affected. Desktop tests currently pin UTC dates (now: '2026-05-29T12:34:56Z' → 2026-05-29).
      Repro
      now = 2026-05-29T16:30:00Z, TZ UTC+8 → local 2026-05-30 00:30, but formatDate returns 2026-05-29.
      Options
      • A: switch formatDate to local timezone, keep "Today's date"
      • B: remove date injection
      • C: pass UTC ISO + local timezone name, explicit semantics
      Verification
      Fixed-now test crossing UTC midnight (2026-05-29T16:30:00Z in UTC+8 = local 2026-05-30).
      Context
      Spun out of PR #531 review (P2, non-blocking). #531 ships CLI system-prompt injection; this is the shared date-fragment timezone semantics, deferred to keep #531 scoped.
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(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
turn-tail date fragment uses UTC, off-by-one near local midnight · Issue #538 · apache/maka · GitHub
          Skip to content
          turn-tail date fragment uses UTC, off-by-one near local midnight #538
          Closed
          #540
          Closed
          turn-tail date fragment uses UTC, off-by-one near local midnight#538
          #540
          Description
          @Astro-Han
          Astro-Han
          opened on Jul 5, 2026
          Problem
          formatDate in packages/runtime/src/system-prompt/session-environment-prompt.ts builds "Today's date" with new Date(now).toISOString().slice(0,10) (UTC). Near local midnight (UTC+8 00:30 = UTC 16:30 previous day) the injected date is one day behind local "today", which can mislead date-sensitive answers.
          Scope
          Shared fragment — both desktop and CLI TUI turn-tail use buildSessionEnvironmentPromptFragment, so both are affected. Desktop tests currently pin UTC dates (now: '2026-05-29T12:34:56Z' → 2026-05-29).
          Repro
          now = 2026-05-29T16:30:00Z, TZ UTC+8 → local 2026-05-30 00:30, but formatDate returns 2026-05-29.
          Options
          • A: switch formatDate to local timezone, keep "Today's date"
          • B: remove date injection
          • C: pass UTC ISO + local timezone name, explicit semantics
          Verification
          Fixed-now test crossing UTC midnight (2026-05-29T16:30:00Z in UTC+8 = local 2026-05-30).
          Context
          Spun out of PR #531 review (P2, non-blocking). #531 ships CLI system-prompt injection; this is the shared date-fragment timezone semantics, deferred to keep #531 scoped.
          Metadata
          Metadata
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              No branches or pull requests
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, 'i');
if (__m === '*' || __re.test(location.href)) {
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} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
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(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
turn-tail date fragment uses UTC, off-by-one near local midnight · Issue #538 · apache/maka · GitHub
              Skip to content
              turn-tail date fragment uses UTC, off-by-one near local midnight #538
              Closed
              #540
              Closed
              turn-tail date fragment uses UTC, off-by-one near local midnight#538
              #540
              Description
              @Astro-Han
              Astro-Han
              opened on Jul 5, 2026
              Problem
              formatDate in packages/runtime/src/system-prompt/session-environment-prompt.ts builds "Today's date" with new Date(now).toISOString().slice(0,10) (UTC). Near local midnight (UTC+8 00:30 = UTC 16:30 previous day) the injected date is one day behind local "today", which can mislead date-sensitive answers.
              Scope
              Shared fragment — both desktop and CLI TUI turn-tail use buildSessionEnvironmentPromptFragment, so both are affected. Desktop tests currently pin UTC dates (now: '2026-05-29T12:34:56Z' → 2026-05-29).
              Repro
              now = 2026-05-29T16:30:00Z, TZ UTC+8 → local 2026-05-30 00:30, but formatDate returns 2026-05-29.
              Options
              • A: switch formatDate to local timezone, keep "Today's date"
              • B: remove date injection
              • C: pass UTC ISO + local timezone name, explicit semantics
              Verification
              Fixed-now test crossing UTC midnight (2026-05-29T16:30:00Z in UTC+8 = local 2026-05-30).
              Context
              Spun out of PR #531 review (P2, non-blocking). #531 ships CLI system-prompt injection; this is the shared date-fragment timezone semantics, deferred to keep #531 scoped.
              Metadata
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                No type
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                  Milestone
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                  None yet
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                  No branches or pull requests
                  Issue actions
                  
, 'i');
if (__m === '*' || __re.test(location.href)) {
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'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
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(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
turn-tail date fragment uses UTC, off-by-one near local midnight · Issue #538 · apache/maka · GitHub
                  Skip to content
                  turn-tail date fragment uses UTC, off-by-one near local midnight #538
                  Closed
                  #540
                  Closed
                  turn-tail date fragment uses UTC, off-by-one near local midnight#538
                  #540
                  Description
                  @Astro-Han
                  Astro-Han
                  opened on Jul 5, 2026
                  Problem
                  formatDate in packages/runtime/src/system-prompt/session-environment-prompt.ts builds "Today's date" with new Date(now).toISOString().slice(0,10) (UTC). Near local midnight (UTC+8 00:30 = UTC 16:30 previous day) the injected date is one day behind local "today", which can mislead date-sensitive answers.
                  Scope
                  Shared fragment — both desktop and CLI TUI turn-tail use buildSessionEnvironmentPromptFragment, so both are affected. Desktop tests currently pin UTC dates (now: '2026-05-29T12:34:56Z' → 2026-05-29).
                  Repro
                  now = 2026-05-29T16:30:00Z, TZ UTC+8 → local 2026-05-30 00:30, but formatDate returns 2026-05-29.
                  Options
                  • A: switch formatDate to local timezone, keep "Today's date"
                  • B: remove date injection
                  • C: pass UTC ISO + local timezone name, explicit semantics
                  Verification
                  Fixed-now test crossing UTC midnight (2026-05-29T16:30:00Z in UTC+8 = local 2026-05-30).
                  Context
                  Spun out of PR #531 review (P2, non-blocking). #531 ships CLI system-prompt injection; this is the shared date-fragment timezone semantics, deferred to keep #531 scoped.
                  Metadata
                  Metadata
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                      None yet
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                      No branches or pull requests
                      Issue actions
                      
, 'i');
if (__m === '*' || __re.test(location.href)) {
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function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
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})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
turn-tail date fragment uses UTC, off-by-one near local midnight · Issue #538 · apache/maka · GitHub
                      Skip to content
                      turn-tail date fragment uses UTC, off-by-one near local midnight #538
                      Closed
                      #540
                      Closed
                      turn-tail date fragment uses UTC, off-by-one near local midnight#538
                      #540
                      Description
                      @Astro-Han
                      Astro-Han
                      opened on Jul 5, 2026
                      Problem
                      formatDate in packages/runtime/src/system-prompt/session-environment-prompt.ts builds "Today's date" with new Date(now).toISOString().slice(0,10) (UTC). Near local midnight (UTC+8 00:30 = UTC 16:30 previous day) the injected date is one day behind local "today", which can mislead date-sensitive answers.
                      Scope
                      Shared fragment — both desktop and CLI TUI turn-tail use buildSessionEnvironmentPromptFragment, so both are affected. Desktop tests currently pin UTC dates (now: '2026-05-29T12:34:56Z' → 2026-05-29).
                      Repro
                      now = 2026-05-29T16:30:00Z, TZ UTC+8 → local 2026-05-30 00:30, but formatDate returns 2026-05-29.
                      Options
                      • A: switch formatDate to local timezone, keep "Today's date"
                      • B: remove date injection
                      • C: pass UTC ISO + local timezone name, explicit semantics
                      Verification
                      Fixed-now test crossing UTC midnight (2026-05-29T16:30:00Z in UTC+8 = local 2026-05-30).
                      Context
                      Spun out of PR #531 review (P2, non-blocking). #531 ships CLI system-prompt injection; this is the shared date-fragment timezone semantics, deferred to keep #531 scoped.
                      Metadata
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                          No branches or pull requests
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
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function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
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observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
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(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
turn-tail date fragment uses UTC, off-by-one near local midnight · Issue #538 · apache/maka · GitHub
                          Skip to content
                          turn-tail date fragment uses UTC, off-by-one near local midnight #538
                          Closed
                          #540
                          Closed
                          turn-tail date fragment uses UTC, off-by-one near local midnight#538
                          #540
                          Description
                          @Astro-Han
                          Astro-Han
                          opened on Jul 5, 2026
                          Problem
                          formatDate in packages/runtime/src/system-prompt/session-environment-prompt.ts builds "Today's date" with new Date(now).toISOString().slice(0,10) (UTC). Near local midnight (UTC+8 00:30 = UTC 16:30 previous day) the injected date is one day behind local "today", which can mislead date-sensitive answers.
                          Scope
                          Shared fragment — both desktop and CLI TUI turn-tail use buildSessionEnvironmentPromptFragment, so both are affected. Desktop tests currently pin UTC dates (now: '2026-05-29T12:34:56Z' → 2026-05-29).
                          Repro
                          now = 2026-05-29T16:30:00Z, TZ UTC+8 → local 2026-05-30 00:30, but formatDate returns 2026-05-29.
                          Options
                          • A: switch formatDate to local timezone, keep "Today's date"
                          • B: remove date injection
                          • C: pass UTC ISO + local timezone name, explicit semantics
                          Verification
                          Fixed-now test crossing UTC midnight (2026-05-29T16:30:00Z in UTC+8 = local 2026-05-30).
                          Context
                          Spun out of PR #531 review (P2, non-blocking). #531 ships CLI system-prompt injection; this is the shared date-fragment timezone semantics, deferred to keep #531 scoped.
                          Metadata
                          Metadata
                          Assignees
                          No one assigned
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
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html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
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filter: invert(1) hue-rotate(180deg) !important;
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.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
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::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
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document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
turn-tail date fragment uses UTC, off-by-one near local midnight · Issue #538 · apache/maka · GitHub
                              Skip to content
                              turn-tail date fragment uses UTC, off-by-one near local midnight #538
                              Closed
                              #540
                              Closed
                              turn-tail date fragment uses UTC, off-by-one near local midnight#538
                              #540
                              Description
                              @Astro-Han
                              Astro-Han
                              opened on Jul 5, 2026
                              Problem
                              formatDate in packages/runtime/src/system-prompt/session-environment-prompt.ts builds "Today's date" with new Date(now).toISOString().slice(0,10) (UTC). Near local midnight (UTC+8 00:30 = UTC 16:30 previous day) the injected date is one day behind local "today", which can mislead date-sensitive answers.
                              Scope
                              Shared fragment — both desktop and CLI TUI turn-tail use buildSessionEnvironmentPromptFragment, so both are affected. Desktop tests currently pin UTC dates (now: '2026-05-29T12:34:56Z' → 2026-05-29).
                              Repro
                              now = 2026-05-29T16:30:00Z, TZ UTC+8 → local 2026-05-30 00:30, but formatDate returns 2026-05-29.
                              Options
                              • A: switch formatDate to local timezone, keep "Today's date"
                              • B: remove date injection
                              • C: pass UTC ISO + local timezone name, explicit semantics
                              Verification
                              Fixed-now test crossing UTC midnight (2026-05-29T16:30:00Z in UTC+8 = local 2026-05-30).
                              Context
                              Spun out of PR #531 review (P2, non-blocking). #531 ships CLI system-prompt injection; this is the shared date-fragment timezone semantics, deferred to keep #531 scoped.
                              Metadata
                              Metadata
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