Counting days between dates is useful for deadlines, billing cycles, travel plans, school assignments, work schedules, legal timelines, and project planning.
Use the Date Calculator to find the number of days between two dates or to add and subtract days from a start date.
Calendar days vs business days
Calendar days include every day on the calendar. Business days usually exclude weekends and may exclude holidays. This difference matters for contracts, shipping, payroll, and office deadlines.
Should you include the start date?
Some situations count the start date, while others do not. For example, a 7-day return window may start the day after purchase, depending on the policy. Always check the rule that applies to your situation.
Related time tools
For time spans within a day, use the Time Calculator. For work shifts and pay estimates, use the Hours Calculator.