When counting days between two dates, it's important to understand the difference between calendar days and business days. Use the Days Between calculator for calendar days, or Business Days for working-days-only counts. Find out how many days, weeks, months, and years since a past date or until a future event—from countdowns to Christmas to calculating your exact age. Track anniversaries, measure time since important events, or calculate age in days with precision. The doomsday for a given year is calculated relative to the anchor day for the century. The "count business days only" checkbox determines whether or not the selected number of days includes weekends.
Alternatively, selecting April 25th as the end day and not checking the "include end day" box would provide the same result. To use the day counter, use the drop-down menus to select a starting month, date, and year. After subtracting public holidays, most workers in the United States have around 249 to 251 actual working days per year.
The calculator has additional settings, which are accessible by clicking the "Settings" link. Use this counter to find the number of days between two dates, including the number of working days, weekends, and holidays.
Similarly, September can be remembered as "working 9 to 5," or 9/5, where May's doomsday is the same, again with the position of the day and month switched (5/9). March's doomsday can be remembered as the first 3 digits of π, 3.14 (3/14). For the even months, except for February, all of the doomsdays occur on the day corresponding to the given month (4/4, 6/6, 8/8, 10/10, 12/12). It is necessary ψαροταβερνα πειραικη to memorize these dates to be able to determine the day of the week, given any date. There are many different algorithms for calculating the day of the week.
Common Uses for a Days Between Dates Calculator
- Day of the Week instantly answers "what day was 12 January 1980?" or "what day will my deadline fall on?".
- Similarly, September can be remembered as "working 9 to 5," or 9/5, where May's doomsday is the same, again with the position of the day and month switched (5/9).
- Yes — every calculator and live event countdown on HowLongAgoGo is free, with no sign-up required.
- Calculate how many days have passed since a specific date.
Essential for project planning, contract deadlines, and accurate business scheduling. Select your start and end dates using the date picker. February's doomsday occurs on the last day of the month, which fall on the 28th in a typical year or the 29th in a leap year. These dates are the same for every year, but the day they all fall on changes with each year. If the box is not selected, the end date is not included in the calculation. If you would like to include holidays, select which common US holidays to include, and/or use the table below to enter other holidays.
Business Days excludes weekends and country-specific public holidays — useful for project deadlines and contract deliverables. The algorithm is based on "doomsdays," which are specific dates that all fall on a certain day of the week in a given year. The calculator returns the number of days between the selected date assuming a Monday to Friday work week and that the weekend falls on Saturday and Sunday. On average, a month has between 20 and 23 business days, depending on the month's length, how weekends fall, and whether public holidays are excluded.
The Doomsday rule
The calculator result will include a count of the number of holidays included in the chosen time span. The day counter or days calculator above can be used in situations such as counting down to a birthday, counting the number of days into a pregnancy, the number of business days left for a project, etc. For example, from January 1 to January 5 there are 4 calendar days, regardless of whether any of those days fall on a weekend. Count business days, working days, and calendar days, weeks, months, and years. Yes — every calculator and live event countdown on HowLongAgoGo is free, with no sign-up required. And the Date Calculator adds or subtracts days, weeks, months, or years from any date — perfect for working out renewal dates, deadlines, or "X days from today".
Add (Substract) Days to a Date Worked Hours & Overtime Calculator Hours and Minutes Calculator Calculate how many days are between two dates or how many days have passed since a date. Every event page and custom countdown has a unique URL. Business days count only Monday to Friday and exclude public holidays. Business day calculations include public holidays for multiple countries including the US, UK, Canada, and Australia. All calculations account for leap years, varying month lengths, and the user's timezone.
Count down to birthdays, holidays, vacation, retirement, or any upcoming event you're anticipating. Calculate how many days have passed since a specific date. Calculate working days between dates, excluding weekends and holidays.
Perfect for calculating future deadlines, project milestones, expiration dates, and scheduling events ahead of time. Ideal for calculating past dates, determining start dates from deadlines, or tracking historical events. Enable "Include time" to add hours, minutes, and seconds for precise results down to the second, useful for tracking project deadlines or calculating exact age. Given a start date and a selected number of days to add or subtract, the calculator will determine the resulting date. The calculator always counts the start date as a full day, and counts the last date as a full day if the "include end day" box is selected. Whether you need to track deadlines, plan ahead, or count elapsed time, a date difference calculator gives you accurate results in seconds.
The export feature generates a shareable link that preserves all settings and results. For business day calculations, enable "Business days only" and select your region. The calculator instantly computes the exact number of days between them. In the year 3000 (2200 + 400 + 400), the anchor day will be a Friday, and so on. Any other anchor day for any century can be determined relative to the anchor days for any chosen consecutive span of four centuries. Thus, it is only necessary to memorize the anchor day for four centuries.