Calculate exact calendar age, the next birthday and weekday, total days alive, common milestones, and a compact birthday history.
Exact age advances through complete calendar years and months, then counts remaining date-only days. Next birthdays and weekdays use timezone-safe Gregorian calendar arithmetic.
The shared Age Calculator algorithm uses actual calendar boundaries.
age = complete calendar years + complete calendar months + remaining daysUTC date-only arithmetic prevents daylight-saving shifts.
days remaining = date-only difference(reference date, next birthday)January 1, 2000 as of January 1, 2026 is exactly 26 years old, Birthday today, with 0 days remaining.
December 25, 2000 as of August 13, 2026 has its next birthday on December 25, 2026 and turns 26.
A February 29 birth date keeps February 29 as the next true birthday; observed milestone/history dates clamp to February 28 in non-leap years, matching the Age Calculator convention.
Use Today or select any valid past or future date on or after the birth date.
Months use real calendar boundaries and are never estimated by dividing days by 30.
The date of birth stays in local component state and is not encoded into the URL or permanently stored.
A birthday generally moves one weekday after a common year and may move two across a leap-day boundary. February 29 patterns need special care.
Common milestone ages are descriptive only and carry no assumed legal meaning. The history displays a manageable window around the selected reference age rather than every birthday.
The next true birthday remains February 29 and may therefore be several years away. For yearly milestone and history rows, the shared observed-birthday convention clamps to February 28 in non-leap years. Personal and legal conventions may differ.
If this year's birthday is today or still ahead, it is used; otherwise the next year's date is used. February 29 uses the next true leap-day date.
The calculator counts exact date boundaries from the reference date to the next birthday.
The birth weekday is calculated from the date-only Gregorian calendar value.
Days are exact date boundaries, weeks are complete seven-day groups plus a remainder, and months are completed calendar months.
The next true birthday stays February 29. Observed annual milestone/history dates clamp to February 28 in non-leap years, consistent with CalcRocket's Age Calculator.
No. It is calculated locally and is not placed in a share URL or permanently stored.