Centralize date/time formatting utilities (#11831)

.github/instructions/copilot.instructions.md

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+# OpenClaw Codebase Patterns
+
+**Always reuse existing code - no redundancy!**
+
+## Tech Stack
+
+- **Runtime**: Node 22+ (Bun also supported for dev/scripts)
+- **Language**: TypeScript (ESM, strict mode)
+- **Package Manager**: pnpm (keep `pnpm-lock.yaml` in sync)
+- **Lint/Format**: Oxlint, Oxfmt (`pnpm check`)
+- **Tests**: Vitest with V8 coverage
+- **CLI Framework**: Commander + clack/prompts
+- **Build**: tsdown (outputs to `dist/`)
+
+## Anti-Redundancy Rules
+
+- Avoid files that just re-export from another file. Import directly from the original source.
+- If a function already exists, import it - do NOT create a duplicate in another file.
+- Before creating any formatter, utility, or helper, search for existing implementations first.
+
+## Source of Truth Locations
+
+### Formatting Utilities (`src/infra/`)
+
+- **Time formatting**: `src\infra\format-time`
+
+**NEVER create local `formatAge`, `formatDuration`, `formatElapsedTime` functions - import from centralized modules.**
+
+### Terminal Output (`src/terminal/`)
+
+- Tables: `src/terminal/table.ts` (`renderTable`)
+- Themes/colors: `src/terminal/theme.ts` (`theme.success`, `theme.muted`, etc.)
+- Progress: `src/cli/progress.ts` (spinners, progress bars)
+
+### CLI Patterns
+
+- CLI option wiring: `src/cli/`
+- Commands: `src/commands/`
+- Dependency injection via `createDefaultDeps`
+
+## Import Conventions
+
+- Use `.js` extension for cross-package imports (ESM)
+- Direct imports only - no re-export wrapper files
+- Types: `import type { X }` for type-only imports
+
+## Code Quality
+
+- TypeScript (ESM), strict typing, avoid `any`
+- Keep files under ~700 LOC - extract helpers when larger
+- Colocated tests: `*.test.ts` next to source files
+- Run `pnpm check` before commits (lint + format)
+- Run `pnpm tsgo` for type checking
+
+## Stack & Commands
+
+- **Package manager**: pnpm (`pnpm install`)
+- **Dev**: `pnpm openclaw ...` or `pnpm dev`
+- **Type-check**: `pnpm tsgo`
+- **Lint/format**: `pnpm check`
+- **Tests**: `pnpm test`
+- **Build**: `pnpm build`
+
+If you are coding together with a human, do NOT use scripts/committer, but git directly and run the above commands manually to ensure quality.