How your numbers are calculated
Calendar days, hours and leap years
Calendar days are date differences, not always 24-hour blocks. On your birth date, zero days have elapsed and day one is in progress. Hours use the selected IANA birth time zone; without a time, they are estimated from noon. Non-existent clock-change times are rejected; repeated times are marked ambiguous. Historical time zones follow your browser’s database.
Months, birthdays and special numbers
Monthly milestones and recurrences use the original day, or the last day of a shorter month. A 29 February birthday appears on the last February day in other years. Repeating numbers use the same digit; palindromes read the same backwards. The considered selection keeps events at least 28 days apart; “All matching dates” includes intervening events. Minute and second experiments in the existing number lab use the device time zone; without a time, they estimate from noon. Such early milestones can shift by a day.
Conditional remaining life expectancy
The optional calculation uses Eurostat demo_mlifetable, 2024 period life tables for Germany, Austria and Switzerland, M/F categories, single ages 0–94. Dataset updated 25 September 2026, retrieved 18 October 2026. It calculates eₓ = Tₓ / lₓ at attained age, not life expectancy at birth minus age. Between birthdays, ages 1–93 use a disclosed uniform-distribution approximation. The first and last supported age intervals use the birthday table value. No single-age value is invented for ages 95 and over.
A reference, not an expiry date
Period tables hold a period’s mortality conditions notionally constant. They are not cohort forecasts. Health, lifestyle, medical progress and personal circumstances are not individually modelled. Years are rounded to one decimal and days to hundreds; 365.2425 days per year is a conversion. Statistical bonus days refer to a dated, fixed reference. Personal bonus days refer to an age or date you chose. Neither predicts your death.
Lifestyle: no invented years
A questionnaire does not provide biological age here. Effects from different studies are not added. The limited smoking cessation comparison from Jha et al., NEJM 2013, shows about 10, 9 and 6 years of group difference compared with continuing to smoke, for quitting at ages 25–34, 35–44 and 45–54. US observational data, not a personal promise. The 0–10 year bar is not an uncertainty interval and changes no horizon line. Outside those groups no such numerical value is shown.
Other factors and actual shared time
Alcohol is described through drinking days and standard drinks of about 10–12 g. Seek medical support for withdrawal if dependence is possible. The WHO generally recommends 150–300 minutes of moderate weekly activity for adults, with strength and balance alongside it. The AASM/SRS recommendation of at least seven hours applies to healthy adults aged 18–60. Diet questions cover only part of a diet; adult BMI is not provided for under-18s. None yields personal time gains. In contrast, 30 minutes × one meeting × 52 weeks is exactly 1,560 planned minutes or 26 hours. Only confirmation saves a window or first date, not automatically experienced memories.
Time capsules and security
The opening date is an organisational reading gate, not a cryptographic time lock. No emails are delivered. Keep your own backups. Encrypted backups use AES-256-GCM with PBKDF2-SHA256, 600,000 iterations, a random 16-byte salt and 12-byte IV. The password stays in the browser; browser data itself remains unencrypted. No password recovery is possible.