Add/subtract days, calculate differences, business days, and date ranges with precision
Add a specific number of days to any date.
Example: January 1, 2024 + 30 days = January 31, 2024
Subtract days from any date to find an earlier date.
Example: March 15, 2024 - 45 days = January 30, 2024
Calculate the exact difference between two dates.
Use case: Project duration, age calculation, planning
Calculate working days excluding weekends.
Use case: Project timelines, delivery dates, SLA
Select the type of date calculation you need from the tabs.
Input the required dates using the date picker or type manually.
For add/subtract operations, enter the number of days.
Click calculate to get detailed results with breakdown.
Business days exclude weekends (Saturday and Sunday). Use the Business Days tab to calculate working days between two dates.
The basic calculator doesn't include holidays. For holiday-adjusted calculations, manually subtract known holidays from the business days result.
Currently, the calculator works with days. To add months, use approximately 30 days per month, or 365 days per year as rough estimates.
The calculator uses the standard date picker format (YYYY-MM-DD) and automatically handles different month lengths and leap years.
The calculator is 100% accurate and accounts for leap years, varying month lengths, and all calendar irregularities.
Yes! The calculator works with any dates in the past or future. There are no restrictions on the date range.
Calendar days include all days of the week, while business days only count Monday through Friday, excluding weekends.
Use the Add Days function with your start date and project duration, or use Business Days for work-only calculations.
Use the Date Difference tab with birth date and current date. For more detailed age breakdowns, try our Age Calculator.
The date calculator works with calendar dates only. For time-zone specific calculations, use our Time Calculator.