Date Calculator - Add/Subtract Days, Months, Years

Calculate dates by adding or subtracting days, weeks, months, or years. Find the difference between two dates. Perfect for deadline and schedule planning.

Add/Subtract from Date

Start Date

Operation

Amount

Unit

Quick Calculations

From today:

Date Difference

From Date

To Date

Breakdown

Calculate a date difference to see breakdown

Common Periods

1 Week	7 days
1 Month (avg)	30.44 days
1 Quarter	~91 days
1 Year	365 days (366 leap)
1 Decade	3,652 days (avg)

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Frequently Asked Questions

Adding months moves to the same day in a future month. If that day doesn't exist (like Jan 31 + 1 month), it rolls to the last valid day (Feb 28/29).

Yes, the calculator handles leap years automatically. February has 29 days in leap years (years divisible by 4, except centuries not divisible by 400).

Business days typically exclude weekends (Saturday/Sunday) and may exclude holidays. This calculator shows both calendar and business day counts.

Enter your start date and add the required number of days, weeks, or months. The tool shows the end date and day of the week to help with scheduling.

Yes. Use the Date Difference calculator to find the exact time between two dates in years, months, and days. Perfect for calculating employment tenure or age.

Calendar days include all days. Business days exclude weekends (typically Saturday and Sunday). For precise business day calculations accounting for holidays, use specialized tools.

Very accurate. The calculator properly handles varying month lengths (28-31 days) and leap years. It counts complete months, not average 30-day periods.

Yes. Add the billing period (e.g., 30 days) to your start date to find the next payment date. Quick calculations help with subscription management.

Different contexts need different precision. Total days is simple. Years, months, days breakdown is useful for age. Business days matter for contracts and project planning.

1 week = 7 days, 1 month (average) = 30.44 days, 1 quarter = ~91 days, 1 year = 365 days (366 in leap years). The reference table shows exact conversions.

Total Days	-
Business Days (Mon-Fri)	-
Weekend Days	-
Total Hours	-
Total Minutes	-

Add/Subtract from Date

Quick Calculations

Date Difference

Difference

Breakdown

Common Periods

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