Calendar calculations
Work with dates without counting manually
Compare two dates or move a date by days, weeks, months, or years.
Date handling
Day differences use calendar days. Month and year shifts follow calendar behavior, so month lengths and leap years are respected.
Local calculation
Dates are processed only in your browser.
Accuracy & trust
Built to be useful. Designed to be checked.
We test and review CoreBase tools, formulas, and information to keep them useful and accurate. Occasional inaccuracies or circumstances specific to your situation can still affect a result, so verify important decisions against your own requirements.
Found something that does not look right? Tell us so we can review and improve it.