Know what the result knows.
Every result identifies its weekend rules and holiday-data coverage. Missing official data is never presented as verified.
Guides →DAYCALO / ABOUT
Clear dates. Better planning.
Daycalo makes date calculations easier to understand by showing the rules and the limits of available data.
Free tools for every kind of date.
Six calculators with rules you can review and results you can use.
Explore all calculators →Dates that matter beyond work.
Private date estimates for everyday planning. No account required and no health profile stored.
Explore personal date tools →