Date calculator
Compare two dates with elapsed and inclusive counts side by side. Add or subtract whole days or weeks, including leap days and year boundaries.
Compare or move datesKnow exactly what you are counting.
Time & Planning
Two practical tools for calendar questions, with the counting rules in plain sight.
Business-day planner
Choose working weekdays, paste explicit holidays and inspect every counted or skipped date. Count an inclusive interval or move forward or backward by working days.
Plan working datesStart with the question, then choose the count.
Friday to Monday can mean 3 elapsed days, 4 inclusive dates or 2 Monday-to-Friday working dates. The tools show which definition they use, so an endpoint never disappears into an unexplained number.
Each calculator includes its own worked guide, examples and limits. Inputs stay in the browser. There is no automatic holiday calendar, time-zone conversion or deadline advice.
Dates and holiday lists stay in this page. They are not uploaded or saved. Loading the site still makes ordinary hosting requests and may update the aggregate page-view counter.