Datumsdifferenz
Berechnen Sie den Zeitraum zwischen zwei Kalenderdaten.
Rechner
Altersrechner
Berechnen Sie Ihr genaues Alter in Jahren, Monaten und Tagen.
Ihre Angaben
Unterstützt von UtilBrixIhr Ergebnis
Your age
26 years, 9 months, 18 days
- Total months
- 321
- Total weeks
- 1.398
- Total days
- 9.788
- Total hours
- 234.912
- Total minutes
- 14.094.720
- Next birthday
- 1. Januar 2027
- Days until birthday
- 74
- Day of birth
- Samstag
For February 29 birthdays, February 28 is used in non-leap years. Calendar totals exclude time-of-day.
Detaillierte Methoden, Beispiele und einige erweiterte Hinweise sind derzeit auf Englisch verfügbar.
Step-by-step instructions (English)
- Enter the date of birth using the date picker.
- Choose today or the specific date on which you need the age.
- Calculate and read calendar years, months, and days separately from the total elapsed days.
Formel und Methode
Count complete calendar months between the birth and target dates, then count the remaining days. Years contain 12 calendar months. February 29 anniversaries fall on February 28 in a non-leap year. Total days are measured between UTC calendar dates, avoiding daylight-saving effects.
Ein praktisches Beispiel
A person born on 1 January 2000 is 25 years, 6 months, and 14 days old on 15 July 2025.
When this tool is useful
Check an age on a school reference date, prepare a birthday milestone, or compare an age today with an age on a future date. Use the target-date field rather than manually adjusting the year, especially when the birthday has not yet occurred.
Common mistakes and limitations
- A year is not always 365 days, and a calendar month is not always 30 days. Avoid converting the total days back to years with a fixed divisor.
- The February 29 convention is a calculation choice; an organization may apply a different rule for legal eligibility.
Practical questions about this tool (English)
Why does subtracting the birth year give a different answer?
Year subtraction ignores whether the birthday has happened on the target date. Someone born in December has not completed another year in January, even though the calendar year has changed.
Does this calculate age down to the time of birth?
No. It uses calendar dates, not birth times or time zones. Use Time Duration Calculator if you need a duration between specified times.