Date Calculator

The Date Calculator is a comprehensive tool for performing various date-related calculations. Whether you need to find the number of days between two dates, add or subtract days from a date, calculate someone's exact age, or count business days, this tool has you covered.

All calculations are performed locally in your browser, ensuring your data remains private and the tool works offline.

Features

• Calculate the exact difference between two dates in days, weeks, months, and years
• Add or subtract days, weeks, months, or years from any date
• Calculate precise age with detailed breakdown
• Count business days excluding weekends and custom holidays
• Display zodiac signs (Western and Chinese)
• Support for various date formats

Common Use Cases

• Project planning and deadline calculation
• HR and payroll calculations
• Contract and lease duration calculation
• Age verification and birthday countdown
• Financial calculations (interest periods, payment schedules)
• Event planning and countdown timers

Tips

• Toggle "Include end date" to count both the start and end dates
• Add holidays to get accurate business day counts
• Use the swap button to quickly reverse date ranges
• The age calculator shows your age in multiple units