Count signed elapsed or inclusive days between two calendar dates, with clear endpoint rules.
Your inputs stay on your device. All calculations run in your browser without uploading, storing or tracking the numbers you enter. Clear formulas and visible assumptions let you review the estimate.
Elapsed days = end date − start date. Inclusive counting adds one to the magnitude and preserves direction; the same date counts as one.
Gregorian dates without time zones. Reversed dates yield negative counts. Fixed 24-hour equivalents do not represent local-clock time over daylight-saving transitions. Business days and holidays are excluded.
Decimal arithmetic uses exact fractions. Currency displays round to two decimals; exact unrounded values are included where relevant. Date calculations use whole Gregorian calendar days. Results are estimates under the stated assumptions.
No. Inputs are processed locally and not persisted. Only the theme preference is stored. Copy and report downloads happen when you choose them.
