Count the exact number of elapsed days between two calendar dates.
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This tool returns the absolute elapsed-day difference between two calendar dates. January 1 to January 31 is 30 days, and reversing those dates still gives 30. It counts calendar days, including weekends and holidays.
Formula · Worked example · Units and assumptions · Questions and answers
Days = |End date − Start date| ÷ 86,400,000 msJanuary 1 to January 31 is 30 elapsed days.
Expecting a signed countdown or business-day count. Use Days Until for a positive or negative direction.
Explanations updated . See the calculation methodology for precision and review details.
Use the matching example buttons in the calculator to load these inputs. The scenarios are illustrative, not personal advice or real customer records.
Result: 30 days
There are 30 elapsed days but 31 calendar dates if both endpoints are included. Choose the convention before using the result for a schedule or record.
Result: 2 days
February 29 adds a calendar day in 2024. The same month-and-day interval in a non-leap year would be one day shorter.
Worked decisions, assumptions, and checks that put the tools in context. Guides are currently published in English.
Choose between elapsed days, inclusive calendar dates, signed countdowns, and completed age with leap-year examples and clearly defined calendar rules.
Read the guide →The result measures elapsed 24-hour date boundaries, so January 1 to January 2 is one day.
No. The calculator returns the absolute difference, regardless of which date comes first.
Dates are compared at UTC day boundaries to avoid daylight-saving-hour distortions.