Days Between Dates Calculator for Calendar and Business Days

Days between dates in one line.

From Jan 1, 2026 to Jun 30, 2026 is 180 days. That equals 25.7 weeks. It is also 5 months and 29 days, with 128 business days in the same date range.

The basic calculation uses subtraction. Subtract the earlier date from the later date. Weeks divide that number by 7. The years, months, and days view follows the calendar. Business days count Monday through Friday.

How to use the days between dates calculator.

Pick two dates, or choose a preset. Every result updates at once.

Calendar days vs business days.

Calendar days include every day on the calendar. Weekdays, weekends, and leap days all count. A 14-day window includes two weekends in most cases. Business days are different: they include weekdays only and skip Saturdays and Sundays. This number matters for notice periods, processing times, shipping estimates, workplace deadlines, and service windows.

This calculator counts weekdays. It does not remove every public holiday. Holidays vary by country, state, employer, school, and carrier. If a deadline depends on holidays, subtract those dates yourself. A full 365 days excluding weekends usually leaves 261 weekdays before holidays, and the exact business-day total changes when the date range starts or ends on a weekend.

How the date math works.

The calculator converts each date to a day number. Then it subtracts the earlier date from the later date. This produces a clean total and helps prevent off-by-one errors.

For weeks, it divides the day count by 7. For the months and days view, it counts full calendar months first, then counts the leftover days. For business days, it checks each date and keeps only Monday through Friday.

The calculator handles leap years automatically. If your range crosses Feb 29, the extra day is part of the total. This detail matters when you compare dates across February in a leap year.

When to include the end date.

By default, the tool counts the gap between two dates. Monday to Tuesday is one day. This method works for elapsed time, countdowns, and most deadline calculations.

Sometimes you need to count both endpoints. A hotel stay from Monday through Tuesday may cover two calendar dates. A permit from June 1 through June 30 may cover 30 included days. Use include the end date when the wording says through, inclusive, or including both dates. Inclusive counting can change a deadline by one day.

Career and notice period examples.

Job seekers use a days between dates calculator for planning decisions.

1. How many days until my start date?

Set today as the start date and your offer date as the end date. The calendar-day count shows your available time. The business-day count shows how many workdays remain.

2. When does my two-week notice end?

Select Two-week notice to count 14 calendar days from today. That usually equals 10 business days, but holidays can change the work schedule.

3. How long is a 90-day probation or contract?

Select Next 90 days to see the calendar window. You also see about 64 business days. That can help you plan reviews, milestones, and check-ins.

Project and planning uses.

Use this calculator for deadlines, billing cycles, lease terms, subscriptions, warranties, return windows, event countdowns, and project timelines. It can also help you find the number of days between two dates for a custom policy or contract, which is useful when a document gives exact dates instead of a simple number of days.

Match the result to the wording in your plan. If it says 30 calendar days, use the calendar-day result. If it says 10 business days, use the weekday result. If it says three months, use the months and days result because months differ in length. Compare the calendar-day count with the business-day count before you commit to a deadline.

Tips for accurate date counts.

Start by checking the wording. Days, calendar days, business days, working days, and weekdays can mean different things. Decide whether to include the end date before you read the result, because including both endpoints adds one day.

Use business days when a policy says business days. Use calendar days when it simply says days. Mixing the two is the most common mistake. Remember that this calculator does not remove holidays; if a due date depends on holidays, subtract those days yourself.

Accuracy notes for formal deadlines.

For legal, payroll, insurance, or compliance deadlines, confirm the counting rule first. Some policies measure elapsed time. Some use inclusive counting. Some move a due date when it lands on a weekend or holiday.

When the result affects money, benefits, or a filing date, treat this tool as a planning aid. Read the governing policy, then check any holiday that could change the deadline. For U.S. federal holidays, use the official OPM holiday calendar and compare those holiday dates with your range: https://www.opm.gov/policy-data-oversight/pay-leave/federal-holidays/.

Days between dates — FAQ.

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