Exact calendar span
Years and months are completed first, followed by the remaining calendar days.
● Exact dates · Leap-aware · Browser-onlyAge, anniversary &
Age, anniversary &
milestone calculator
Calculate an exact age or anniversary, find the next annual date and plan meaningful day, week, month and year milestones.
✓ No sign-up✓ Browser-based✓ Instant results
01 · Enter dates
Calculate an exact age
Date-only calculation avoids time-zone shifts and daylight-saving ambiguity.
✓
Browser-only calculationYour dates, age and milestone results are not uploaded, submitted or included in analytics.
Calendar-accurate planning
Understand every date behind the result
Utilaroo compares date-only UTC calendar values, counts elapsed days without including the starting instant, and lets you choose how 29 February recurs in non-leap years.
Leap-day control
Choose 28 February or 1 March for non-leap-year anniversaries.
No personal-date analytics
Birth dates, anniversaries and derived ages remain in your browser.