Calculate the number of days between two dates or count days from a specific date. Include business days, weekends, and holidays in your calculations with our comprehensive day counter.
Our day counter offers two powerful calculation modes to help you work with dates effectively:
Select a start date and end date to calculate the exact number of days between them. You can choose to include or exclude the end day in your calculation. The calculator provides a detailed breakdown showing total days, weekdays, weekends, and any holidays that fall within your selected date range.
Start with a specific date and add or subtract a number of days to find the resulting date. This is perfect for calculating project deadlines, future appointments, or determining dates a certain number of days in the past. Enable "business days only" to exclude weekends from your calculation.
Customize your calculations by including or excluding holidays. Our calculator includes all major US federal holidays and allows you to add custom holidays specific to your needs. Business day calculations automatically exclude weekends and can also exclude holidays for accurate project planning.
The calculator shows the day of the week for your selected dates using proven algorithms. This feature is particularly useful for planning events, scheduling meetings, or determining which day of the week a particular date falls on.
Named after mathematician John Conway, the Doomsday rule is a method for determining the day of the week for any date. The algorithm is based on "doomsdays" - specific dates that all fall on the same day of the week in any given year. These reference points make it possible to calculate the day of the week for any date with simple arithmetic.
Some memorable doomsday dates include 4/4, 6/6, 8/8, 10/10, and 12/12 (all even months except February). For odd months, remember "I work from 9 to 5 at 7-Eleven" which gives you 9/5, 5/9, 7/11, and 11/7. January's doomsday is 1/3 (or 1/4 in leap years), while February's is the last day of the month.
Whether you're planning a project, organizing an event, or simply curious about dates, our day counter provides accurate calculations with the flexibility to accommodate your specific needs and regional holidays.