Useful date math, without the spreadsheet.

DayCountLab is a small collection of focused date calculators for the moments when a calendar alone is not quite enough.

Why we built it

Counting workdays, checking a due date, or finding the exact time between two dates should not require an account, a complicated project-management app, or a spreadsheet formula. DayCountLab puts the answer first and explains the counting rule beside it.

What we value

Clear inputs, transparent assumptions, fast results, and respectful advertising. Calculations happen in your browser and the dates you enter are not sent to our servers.

What DayCountLab is not

DayCountLab is a general planning aid, not legal, payroll, tax, financial, or medical advice. For regulated deadlines or contractual dates, verify the applicable calendar and rules with a qualified professional.