Date Calculator Add Or Subtract Days, Months & Years
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In addition, for a more human-readable type of date duration format, the last box displays exactly that. However, for the ⇢ Duration Between operation type, you'll see quite a display of results. For the ➕ Add and ➖ Subtract operation types, the result is labeled with "📅 Date", which displays the calculated date. The third is the result area, where it displays the outcome of the calculations.
Month and year changes follow the real calendar — including shorter and longer months and leap years — so you do not have to count by hand. For precise business-day math including U.S. federal holidays, see our federal holidays 2026–2027 table. The exact answer depends on where weekends and holidays fall — use the calculator with the month-by-month table above to sanity-check any "business days" deadline. The underlying date library (date-fns) handles all edge cases including month-length variations and leap year rules. If your calculation spans a February 29 (a leap day), the result will be accurate. The "count business days only" checkbox determines whether or not the selected number of days includes weekends.
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