Date Calculator

Calculate days between dates or add/subtract time — free, no signup

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Date Calculator

This free date calculator lets you find the exact number of days, weeks, months, and hours between any two dates — or calculate a future or past date by adding or subtracting a time period. Useful for project planning, deadline tracking, event countdowns, and age calculations.

Common Use Cases

Project Deadlines

Calculate how many working days remain until a project deadline or sprint end date.

Age Calculation

Find out exactly how many days old you are — or how many days until your next birthday.

Contract Duration

Determine the exact length of a contract or service period in days, months, and years.

Event Countdown

Find how many days until a wedding, vacation, product launch, or important date.

Date Arithmetic

Add 90 days to an invoice date, subtract 30 days from a return deadline, or find what date falls 6 months from today.

Historical Research

Calculate how many days elapsed between historical events or how long ago something occurred.

Frequently Asked Questions

How are months counted in date differences?
Month differences account for the varying lengths of months. From Jan 31 to Mar 1 is 1 month, 1 day (not exactly 30 days). The calculator shows the result in years, months, and remaining days for precision.
Does the calculator account for leap years?
Yes. The calculator uses JavaScript's native Date object which correctly handles leap years, daylight saving transitions, and all calendar irregularities.
What is the difference between business days and calendar days?
Calendar days count every day including weekends and holidays. Business days count only Monday–Friday. This calculator uses calendar days. For business day calculations, you would need to subtract weekends (and holidays) manually.
Can I calculate dates in the past?
Yes. Enter any date in the past as your start date. The result shows the absolute difference between the two dates regardless of order.

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