Date Calculator
Calculate the exact difference between two dates in years, months and days. Quickly find the total number of days and weeks between any two dates.
How to Use
1. Enter the Start Date
Select the first date you want to use in the calculation.
2. Enter the End Date
Select the second date you want to compare with the start date.
3. Calculate the Date Difference
Click Calculate to find the exact amount of time between the two dates.
4. View Your Results
See the difference in years, months and days, along with the total number of days and weeks between the selected dates.
Date Calculate
Enter a start date and end date below to calculate the exact difference in years, months and days, along with the total number of days and weeks between the two dates.
What Do These Results Mean?
Exact Difference
The precise time between the two selected dates, shown in years, months and days.
Total Days
The total number of calendar days between the start date and end date.
Total Weeks
The total number of days converted into weeks. Because many date ranges do not divide evenly by seven, this result may include decimal places.
Total Months
The number of completed months between the two dates.
Start Date
The earlier of the two dates used in the calculation.
End Date
The later of the two dates used in the calculation.
Example Calculation
See how the Date Calculator works with a simple example.
Example:
Suppose you want to calculate the difference between:
Start Date: 1 January 2026
End Date: 1 January 2027
The results would be:
Exact Difference: 1 year, 0 months, 0 days
Total Days: 365 days
Total Weeks: 52.14 weeks
Total Months: 12 months
Explanation
The calculator compares the two selected dates and measures the complete time between them. In this example, the dates are exactly one year apart, which equals 365 days, approximately 52.14 weeks, and 12 completed months.
Date Calculation Formula
The Date Calculator compares two calendar dates and calculates the exact difference between them, as well as the total number of days, weeks and completed months.
Exact Date Difference
Date Difference = End Date − Start Date
The calculator breaks this difference down into completed years, months and remaining days.
Total Days
Total Days = End Date − Start Date
The difference between the two dates is converted into the total number of calendar days.
Total Weeks
Total Weeks = Total Days ÷ 7
For example:
365 days ÷ 7 = 52.14 weeks
Total Completed Months
Total Months = (Completed Years × 12) + Completed Additional Months
If the dates are entered in reverse order, the calculator automatically uses the earlier date as the start date and the later date as the end date.
Date Calculator Terms Explained
Understand the key terms used in the Date Calculator.
Start Date
The first date used in the calculation. If the dates are entered in reverse order, the calculator automatically treats the earlier date as the start date.
End Date
The second date used in the calculation. The later date is used as the end of the calculated period.
Exact Difference
The precise difference between the two dates expressed in completed years, months and remaining days.
Total Day
The complete number of calendar days between the two selected dates.
Total Weeks
The total number of days divided by seven and expressed in weeks, including a decimal where necessary.
Total Months
The number of completed months between the two dates, calculated from the completed years and additional months.
Frequently Asked Questions
Find answers to common questions about calculating the difference between two dates.
Can I enter the dates in either order?
Yes. If you enter the later date first, the calculator automatically identifies the earlier date as the start date and the later date as the end date.
Does the Date Calculator include leap years?
Yes. The calculator uses actual calendar dates, so leap years and their additional day are taken into account when calculating the total number of days.
Why does the total weeks result include decimals?
A date range may not contain an exact number of seven-day weeks. The calculator divides the total number of days by seven, so the result may include decimal places.
What can I use the Date Calculator for?
You can use it to calculate time between dates for projects, deadlines, events, contracts, travel planning, anniversaries and many other everyday purposes.
Disclaimer
This Date Calculator is provided for general informational and productivity purposes only.
Results are based on the calendar dates entered and are intended for everyday date calculations.
Specific legal, financial, contractual or administrative calculations may use different rules for counting dates or deadlines. Always check the applicable requirements where an official date calculation is needed.