How do I calculate days between two dates?

Enter a start date and end date in the date calculator. It instantly shows the total days, weeks, and months between them. It also shows business days (excluding weekends). For example: January 1 to March 15 = 73 days, 10 weeks and 3 days, or 52 business days.

How do I add days to a date?

Enter a start date and the number of days to add. The calculator shows the resulting date. For example: start from April 3, add 90 days = July 2. Useful for calculating deadlines, due dates, contract expirations, and payment schedules.

What is 30/60/90 days from today?

Use the add-days feature with today as the start date. 30 days from April 3 = May 3. 60 days = June 2. 90 days = July 2. These intervals are common for payment terms (Net 30, Net 60, Net 90), probation periods, return policies, and legal deadlines.

Does the calculator count business days?

Yes. Business days exclude Saturdays and Sundays. A 30-calendar-day period typically contains 21-22 business days. This matters for legal deadlines (many court deadlines use business days), shipping estimates, and corporate payment terms.

How many weeks are between two dates?

The calculator divides the total days by 7. For example: 73 days = 10 weeks and 3 days. It shows both the exact week count and the remaining days. Useful for pregnancy tracking (40 weeks), project planning, and academic schedules.

Can I calculate months between dates?

Yes. The calculator shows the difference in years, months, and days. For example: January 15 to September 3 = 7 months and 19 days. Month calculation accounts for different month lengths (28-31 days).

How do I subtract days from a date?

Enter a date and a negative number of days (or use the subtract feature). For example: April 3 minus 14 days = March 20. Useful for calculating when something started if you know the end date and duration.

Is the date calculator accurate for leap years?

Yes. The calculator correctly handles leap years (February 29), different month lengths, and year boundaries. February 28, 2024 + 1 day = February 29, 2024 (leap year). February 28, 2025 + 1 day = March 1, 2025 (not a leap year).

Date Calculator — Days Between Dates, Add/Subtract Days (Free)

Last updated: April 20266 min readCalculator Tools

How many days until your deadline? What date is 90 days from now? How many business days between two dates? Enter your dates and get instant answers — days, weeks, months, and business days.

Enter two dates — get days, weeks, months, and business days instantly.

Open Date Calculator

What the Date Calculator Does

Function	Input	Output	Example
Days between dates	Start date + End date	Total days, weeks, months, business days	Jan 1 → Mar 15 = 73 days
Add days to date	Start date + number of days	Resulting date	Apr 3 + 90 days = Jul 2
Subtract days	Start date + number of days	Earlier date	Apr 3 - 14 days = Mar 20
Business days	Start date + End date	Weekdays only (Mon-Fri)	73 days = 52 business days
Weeks between	Start date + End date	Weeks + remaining days	73 days = 10 weeks, 3 days

Common Date Calculations

Question	Calculation	Answer (from Apr 3, 2026)
What is 30 days from today?	Apr 3 + 30	May 3, 2026
What is 60 days from today?	Apr 3 + 60	June 2, 2026
What is 90 days from today?	Apr 3 + 90	July 2, 2026
What is 6 months from today?	Apr 3 + ~183 days	October 3, 2026
What is 1 year from today?	Apr 3 + 365	April 3, 2027
How many days until Christmas?	Apr 3 → Dec 25	266 days
How many days until New Year?	Apr 3 → Jan 1, 2027	273 days

Business Days vs Calendar Days

Business days exclude weekends (Saturday and Sunday). This distinction matters for:

Legal deadlines: Many court filings use business days ("respond within 30 business days")
Payment terms: Net 30 typically means 30 calendar days, but some contracts specify business days
Shipping estimates: "Ships in 5-7 business days" = 7-9 calendar days
Work schedules: A 2-week notice = 10 business days = 14 calendar days

Calendar Days	Business Days (approx)	Common Use
7	5	One work week
14	10	Two-week notice period
30	21-22	Net 30 payment, monthly cycle
60	42-44	Net 60, probation period
90	63-66	Net 90, quarterly review
180	126-131	6-month review
365	251-253	Annual planning

Use Cases

Project planning: Calculate how many work days until a deadline
Contract deadlines: "60 days from signing" — what exact date?
Pregnancy tracking: Due date is 280 days (40 weeks) from last period
Lease planning: When does a 12-month lease starting June 1 end?
Event countdown: How many days until your wedding, vacation, or exam?
Age calculation: Exactly how old are you in days?

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Calculate any date math — days between, add/subtract, business days, weeks.

Open Date Calculator

Date Calculator — Days Between Dates, Add/Subtract Days (Free)

What the Date Calculator Does

Common Date Calculations

Business Days vs Calendar Days

Use Cases

Related Calculators

Related Posts

30/60/90 Days From Today

Weeks Between Dates

Business Days Calculator

How to Calculate