Age

Counts full years, then leftover months and days up to today. Invalid calendar dates are rejected.

Year of birth

Month

Day

Years

Months

Days

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An educational estimate. Not medical, tax or credit advice.

Days, weeks and weekdays between two dates, or a date plus a number of days.

Count working days between two dates, skipping weekends and Polish public holidays, or add working days to a date.

Hours between two clock times, minus a break. Also add minutes to a start time.

A wake time or bedtime from 90-minute cycles plus the minutes you need to fall asleep.

Hours short of the sleep you wanted, over a run of nights.

Hours fasted and the eating window from two clock hours.