Date calculators
Everyday date math without the off-by-one errors.
30 days (4 weeks 2 days)
- Days between two dates Total days, weeks and days, and weekday count
- Day of the week lookup What day was, or will be, any date?
- Chronological age Years, months, and days between dates
- Public holidays Official holiday lists by country and year
N days from today
Frequently asked questions
Do these calculators handle leap years and DST?
Yes. Day math runs on UTC dates, so daylight-saving clock changes never add or drop a day, and February 29 is counted exactly when it occurs.
Are business days supported?
The days-between calculator also reports how many of the counted days are weekdays. Public holidays vary by country, cross-check with the holidays section.
Why do the pages update after loading?
The static page is prerendered on our last build; a tiny script immediately recomputes every date against your device clock, so answers are always current.