Worked examples
These are pre-computed examples, not live queries — each card shows the verified answer and links to the calculator prefilled with the same inputs, so you can rerun or adjust it yourself.
Lookup tables by day count
Prefer to read the answer off a table? Each page below lists every start date across a two-year window with the resulting date and its weekday — no input needed.
Does the count include the start date?
By default this calculator counts exclusively: the start date is day 0, so 1 day from July 29, 2025 is July 30, and 180 days from July 29, 2025 is January 25, 2026. This matches how deadlines, return windows, and "days from now" are usually counted.
Some situations — rental periods, event day counts, school or work schedules — count inclusively, treating the start date itself as day 1. Check "Count the start date as day 1" and the result shifts one day toward the start: 180 days from July 29, 2025 becomes January 24, 2026.
Not sure which you need? If the instruction says "within 180 days of July 29," the exclusive default is almost always right. If it says "starting July 29, count 180 days," use the inclusive option.
Frequently asked questions
How do I find the date N days from a specific date?
Enter your start date, type the number of days, choose Add or Subtract, and press Calculate. The result shows the weekday and full date, plus facts like the ISO date, day of year, and week number.
Does the count include the start date?
By default, no — the count starts the day after your start date, so 1 day from July 29 is July 30. Turn on "Count the start date as day 1" to count the start date itself, which shifts the result one day earlier when adding (or one day later when subtracting).
Can I share a calculation with someone?
Yes. After every calculation the page URL updates to contain your exact inputs (start date, days, direction, and counting option). Use the Copy link button to copy that URL — anyone who opens it sees the same prefilled calculation.
What if I need business days instead of calendar days?
The result panel shows the same count in business days (weekends skipped) alongside the calendar answer, with a link that carries your inputs over to the business days calculator, which can also exclude US federal holidays and custom dates.
Counting from today instead of a chosen date?
Use the days-from-today calculator