i18n-date-patterns

# i18n and Localization Patterns

## Overview

This skill provides comprehensive guidance for implementing internationalization in React applications. It ensures ALL user-facing strings, date displays, currency, lists, and time calculations are locale-aware.

**When to use this skill:**
- Adding ANY user-facing text to components
- Formatting dates, times, currency, lists, or ordinals
- Implementing complex pluralization
- Embedding React components in translated text
- Supporting RTL languages (Hebrew, Arabic)

**Bundled Resources:**
- `references/formatting-utilities.md` - useFormatting hook API reference
- `references/icu-messageformat.md` - ICU plural/select syntax
- `references/trans-component.md` - Trans component for rich text
- `checklists/i18n-checklist.md` - Implementation and review checklist
- `examples/component-i18n-example.md` - Complete component example

**Canonical Reference:** See `docs/i18n-standards.md` for the full i18n standards document.

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## Core Patterns

### 1. useTranslation Hook (All UI Strings)

Every visible string MUST use the translation function:

```tsx
import { useTranslation } from 'react-i18next';

function MyComponent() {
  const { t } = useTranslation(['patients', 'common']);
  
  return (
    <div>
      <h1>{t('patients:title')}</h1>
      <button>{t('common:actions.save')}</button>
    </div>
  );
}
```

### 2. useFormatting Hook (Locale-Aware Data)

All locale-sensitive formatting MUST use the centralized hook:

```tsx
import { useFormatting } from '@/hooks';

function PriceDisplay({ amount, items }) {
  const { formatILS, formatList, formatOrdinal } = useFormatting();
  
  return (
    <div>
      <p>Price: {formatILS(amount)}</p>        {/* ₪1,500.00 */}
      <p>Items: {formatList(items)}</p>        {/* "a, b, and c" */}
      <p>Position: {formatOrdinal(3)}</p>      {/* "3rd" */}
    </div>
  );
}
```

See `references/formatting-utilities.md` for the complete API.

### 3. Date Formatting

All dates MUST use the cen