Enter a birth date and optional reference date to get a precise age breakdown. Defaults to today.
Dates
Practical tips & common mistakes
Time zones and leap years
Exact age in days depends on birth time and timezone. This tool uses calendar dates — fine for eligibility, not legal timestamps.
Off-by-one on milestones
Turning 18 "on" your birthday vs the day after varies by jurisdiction. Verify cutoff rules for voting, contracts, and benefits.
Planning windows
Use total days between dates for warranty expirations, trial periods, and 90-day return policies.
Documentation
Government IDs and benefits systems use their own date rules. Treat this as a planning helper, not a legal age certificate.