System

Date/Time Locale

Formatting preferences

Live Playground

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API Docs

Endpoint

GET /api/fingerprint/date-time-locale

Examples

About

Date/time locale fingerprinting analyzes Intl.DateTimeFormat().resolvedOptions() to extract detailed locale preferences including timezone, calendar system, numbering system, hour cycle (12h vs 24h), date/time formatting patterns, and regional preferences. The combination of these settings is highly distinctive: timezone reveals geographic location, calendar system indicates cultural background (Gregorian, Buddhist, Islamic, Hebrew), hour cycle shows regional preferences (US uses 12h, most of world uses 24h), and numbering system reveals language preferences. This data correlates with navigator.languages and timezone to create precise geographic and cultural profiles. The settings are stable and reflect user's deliberate configuration choices.

Use Cases

•Locale detection
•Time formatting
•Calendar system
•Regional preferences

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