Date Calculator

A date calculator helps you answer questions like “How many days are between these dates?” and “What date is 90 days from now?”. It’s useful for planning, project schedules, travel, and tracking deadlines.

This tool can count days between two dates, and it can add or subtract calendar units (days, weeks, months, and years) starting from a chosen date.

• Choose Count days to calculate the days between a start and end date.
• Use Add days to move forward from a start date by a number of years, months, weeks, and days.
• Use Subtract days to move backward from a start date by a number of years, months, weeks, and days.

For business-style counting, you can exclude certain weekdays (for example, weekends) and choose whether to include the end date in the count.

• Plan a project timeline and count working days between milestones
• Estimate delivery windows or return periods
• Count days until an event like a birthday or holiday
• Compute a future or past date from a known start date

The date calculator includes a few practical options:

• Include or exclude the end date when counting.
• Exclude specific weekdays (useful for weekday-only counts).

If you use date calculator often, bookmark this page or pin it as a shortcut so it’s always one tap away. For the best experience, keep the tab open and interact with the controls once so your browser allows audio alerts, permission prompts, or full-screen mode when needed.

For presentations, classrooms, or a second monitor, try full-screen mode. It centers the tool and removes distractions, and the zoom buttons let you fit the display to your viewing distance.

Browsers can throttle timers in background tabs to save battery. These tools keep accurate time by calculating against a stable clock, so even if the UI updates less frequently, the underlying time stays correct when you return.