ToolNix.io
Date Calculator
Calculate days between dates, add or subtract days, and find working days — instantly.
Days Between Dates
Add / Subtract Days
Working Days
Select Two Dates
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Days
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Weeks
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Months
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Years
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Weekdays
📅 About This Calculator
Our free Date Calculator computes the exact number of days, weeks, months, and years between any two dates — or adds and subtracts days from a date to find a future or past date. It automatically accounts for leap years and varying month lengths for accurate results in any year.
Use it to calculate project deadlines, count days until an event, determine contract end dates, calculate age, or find out what date falls exactly 90 days from now — instantly and accurately.
📋 How to Use the Date Calculator
1
Choose your calculation type — Select either 'Days Between Two Dates' to find the duration, or 'Add/Subtract Days' to find a future or past date.
2
Enter the start date — Click the date picker or type the date in the format shown. The calendar handles any date from 1900 onward.
3
Enter the end date or number of days — For duration, enter the end date. For adding or subtracting, enter the number of days to move forward or backward.
4
Click Calculate — See the result in days, weeks, months, and years with a clear breakdown.
5
Use optional settings — Exclude weekends to count only business days, or include specific holidays for workplace deadline calculations.
❓ Frequently Asked Questions
To find the number of days between two dates, subtract the earlier date from the later date. Our calculator counts every calendar day including weekends. It also accounts for leap years automatically. Example: from January 1 to March 31 of a non-leap year = 89 days.
Use our Add Days feature: enter today as the start date and add 90 days. The calculator returns the exact future date. This is useful for legal deadlines, loan terms, subscription renewals, and contract expiry dates.
Our calculator counts from the start date up to but not including the end date by default — the same method used by most legal and financial contracts. For example, from January 1 to January 31 = 30 days. Toggle the inclusive option to count both the first and last date.
Enable the 'Exclude Weekends' option in our calculator to count only Monday through Friday. This is useful for calculating working days for project management, payroll cycles, or legal notice periods. Note that public holidays are country-specific and should be accounted for separately.
Divide the total number of days by 7. Our calculator shows this automatically. Example: 91 days = exactly 13 weeks. Partial weeks are shown as a decimal. This is useful for pregnancy tracking (counted in weeks), school terms, and subscription billing cycles.