The age calculator turns dates into a practical result for the local calendar. To use it, enter a birth date and a comparison date. It returns years, months, and days, avoiding mental arithmetic across months of unequal length, leap years, and dates that sit on opposite sides of midnight.
It is useful for checking an age for school enrolment, a licence milestone, Superannuation planning, or a birthday. Enter the full year when it affects the answer, and share the inputs with the result so the counting method stays clear.
Local detail can change the interpretation: birthdays reached in NZST or NZDT. Public holidays, anniversary days, school terms, and weekends count only when the chosen calculation includes them.
Treat the result as a calendar aid and check any legal, payroll, immigration, medical, or contractual deadline against the rule used by the responsible organisation.
For a date on the mainland, the clock normally follows NZST in winter and NZDT in summer; the Chatham Islands use their own offset 45 minutes ahead.
A spring-forward night contains one fewer clock hour, while the autumn change repeats part of the night, so elapsed time and calendar-day counts can differ.
Check locally.
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