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People calculate the difference between two dates in days or weeks for various practical reasons. This information is crucial for tasks like project management, financial planning, contract management, and personal organization. For instance, project managers determine project duration, financial analysts calculate interest accrual periods, contract administrators track contract expiration dates, and individuals plan events or set reminders. By knowing the time elapsed between two dates, individuals and organizations can make informed decisions and plan effectively. CalcDate is a compact program can add or subtract time units from a given date, or calculate the difference between two dates in years, months, weeks, and days, even handling leap years automatically for accurate results. With CalcDate, it would be much easier to subtract two dates and calculate number of days, weeks, months or years. How to Add or Subtract Days to a Date 1. Click on the right dropdown list and choose "Time Units". 2. Click on the left dropdown list to choose "Add" or "Subtract". 3. Fill the weeks you want to add or subtract to the "Days" box. 4. Click on the "Calculate Now!" button and then you will see the result instantly. So adding or subtract months or weeks would be same, you only need to choose the corresponding time units. Of course you can also combine the time units above to add or subtract to a given date at once, like adding 3 years 5 months 4 weeks and 164 days. How to Subtract Two Dates and Calculate Number of Days, Weeks, Months or Years 1. Click on the right dropdown list and choose "Specific Date". 2. Choose the Second Date to be calculated in the New Date Box. 3. Choose a result unit in the Result Unit Box, such as Days, Weeks, Months or Years. 4. Click on the "Calculate Now!" button and then you will see the result immediately.