To use weeks calculator, choose any option, such as adding or subtracting weeks to a specific date, or seeing the number of weeks between two dates. For example, adding 4 weeks to January 1, 2025, will give you January 29, 2025. Subtracting 3 weeks from March 10, 2025, will give you February 17, 2025.
Steps To Use the Weeks Calculator
- Select Operation: Choose any one option according to your requirement, like Add Weeks, Subtract Weeks, or Weeks Between using the radio
buttons at the top. However, by default it is selected Weeks Between.
- Enter Values:
- For Weeks Between: Select a Start Date and an End Date. The calculator will show you
the total weeks. The initial result is 1 week between two dates.
- For Add Weeks: Select a starting Date" and enter number of Weeks to add. The calculator
will show the future date.
- For Subtract Weeks: Select a starting Date and enter number of Weeks to subtract. The
calculator will show the past date.
- Dates: All date fields are editable, click on and use the date picker or type a
date in `YYYY-MM-DD` format.
- Calculate: Click the Calculate button to perform the calculation and see the results.
.
- Results:
- The main result is displayed in a large font.
- The descriptive sentence below provides more context about weeks calculation.
- Clear Button: Click Clear to reset all input fields and the result display to the default
Weeks Between calculation.
Note: The maximum number of weeks for addition or subtraction is
5220, approx 100 years. The calculations take into account different lengths of months
and leap years.
Weeks Between Dates Calculation:
To calculate the number of weeks between two dates, you can use the following formula:
- End Date: The later date.
- Start Date: The earlier date.
- Weeks: The total number of weeks between the two dates.
Weeks = (End Date − Start Date) ÷ 7
- Dates to Milliseconds: Subtract the start date from the end date to
find the difference in milliseconds.
- Milliseconds to Days: Divide the difference by 1000 × 60 × 60 × 24
to convert milisecond into days.
- Days to Weeks: Divide the total number of days by 7 to get the number of weeks.
Days = Difference ÷ (1000 × 60 × 60 × 24)
Then, Weeks = Days ÷ 7
This is how you can use the formula to calculate the number of weeks between two dates.