📅 Date Calculator

This tool supports multiple calculation modes: 1) Calendar days — total days between two dates including weekends; 2) Workdays — excludes Saturdays and Sundays, counting only Monday-Friday; 3) Precise time difference — shows years, months, days, hours, minutes, and seconds; 4) Date add/subtract — add or subtract N days from a starting date. All calculations happen locally in your browser.

Calendar days count every day between two dates including weekends and holidays, suitable for contract periods, visa validity, rental agreements, etc. Workdays count only Monday through Friday, excluding Saturdays and Sundays, suitable for project timelines, approval processing, delivery schedules, and HR attendance tracking. Note that workday mode does not exclude public holidays — for holiday-adjusted calculations, manually adjust the result.

Select a start date, enter a number of days (positive for future, negative for past), and click calculate. For example: start date 2024-01-01, enter 90 → result is 2024-03-31; enter -30 → result is 2023-12-02. In workday mode, weekends are skipped so the result lands on the nearest workday. The tool also shows the precise time difference from the original date.

In calendar days mode with 'Include start and end dates' checked (default), both the start and end dates count. For example, 2024-01-01 to 2024-01-01 equals 1 day — consistent with common legal and business conventions. Uncheck this option if your use case excludes the start or end date. In workday mode, the calculation counts workdays between the dates including both endpoints if they are workdays.

Yes. The tool is fully responsive and works on phones, tablets, and desktops. All date calculations happen in your browser locally — no data is sent to any server, and your date information never leaves your device. You can safely use it to calculate sensitive dates such as contract deadlines, project milestones, and personal schedules without privacy concerns.