I built a small browser-based toolkit for date calculations:
https://datecalculatortools.com/
It includes:
- Date Calculator
- Business Days Calculator
- Date Duration Calculator
- Add Days to Date
- Subtract Days From Date
- Weekdays Calculator
The goal is to make common date calculations easier, especially for deadlines, project planning, schedules, and business-day estimates.
The first version does not try to handle every country-specific holiday calendar. It focuses on clear calendar-day, weekday, and business-day calculations that can be used quickly in the browser.
Feedback on confusing wording, missing examples, or useful additional calculators would be helpful.