Count dates. See how.
Every answer shows the counting convention behind it —
because "how many days" has more than one honest answer.
Exclusive vs inclusive. Three business-day methods. Leap years done right.
Business days calculatorThe counting standards behind every answer
Both conventions, always
Every "days between" result shows the exclusive count and the inclusive count. We never silently pick one for you.
Three business-day methods
Excel semantics, exclude-the-start, and the +1 compensation — the three answers professionals argue about, on one screen. Try it.
Fresh by construction
The site rebuilds daily. "Days until Halloween" is never last year's number, and "weeks left in 2026" retitles itself in January.
All date tools
- Date calculator — add days, weeks, months; shift times across midnight
- Days between dates — both counting conventions, leap years exact
- Business days calculator — the three-convention flagship
- Holiday countdown — every major holiday, counted
- Seconds in a day — full time-unit table
- Weeks left in 2026 — ISO week numbers, live
- 90 days from today · 180 days · 30 · 14 · 45 · 28 · 21 · 10 · 12 weeks · 6 months
- Guide: what "90 days" actually means · Guide: business-day standards
Popular counts: 90 days→180 days→30 days→14 days→45 days→28 days→21 days→10 days→12 weeks→6 months
Last updated 2026-11-04 · Calculations follow the full leap-year rule (including the year 2100 exception).