Date & time calculators
Calculate your exact age, find the gap between two dates, count business days, set countdowns, and do date arithmetic — all free and instant.
About date & time calculators
These tools handle the tricky parts of date arithmetic — leap years, varying month lengths, time zones, and weekends — so you get the right answer without a spreadsheet.
Which calculator should I use?
- How old am I? The age calculator gives your exact age in years, months, and days.
- How long between two events? Date difference counts exact days, weeks, and months.
- When is X days from now? Add or subtract days gives you the resulting date.
- How many work days in a period? Work days calculator skips weekends automatically.
Common questions
Do these calculators account for leap years?
Yes. All date calculators correctly handle leap years (years divisible by 4, except centuries unless divisible by 400). February 29 is counted when it falls within the range.
What counts as a work day?
The work days calculator counts Monday through Friday and excludes Saturday and Sunday. Public holidays vary by country and are not excluded automatically — subtract them manually if needed.
Are these free to use?
Yes. Every calculator is completely free, no signup, no email capture. All calculations happen in your browser.