Datum: Age at Test Date

Datum gives you exact age in years, months and days at any test date, the way scoring protocols ask for it. Type two dates on a big keypad, see 7;4;12 right away, and tap once to copy 7;4 or "7 years, 4 months" into your report.

Choose the rules your manual uses
- Day count: borrow-30 (the hand subtraction printed on most record forms) or calendar (the real number of days in each month).
- Leftover days: drop them, round up at 15 or more, round up at 16 or more, or show them.
- The active rule is printed under every result, so anyone checking your report can see how the number was made.

Built for a full caseload
- A keypad made for speed. No scroll wheels, no sliders. Hardware keyboards work on iPad.
- Corrected age for babies born early, from gestational weeks and days, with postmenstrual age before the due date and a correction cutoff you choose (18, 24 or 36 months, or never).
- Up to six test dates per child in one calculation.
- A paper tape of everything you copied this session.
- Six copy formats plus your own templates.
- Saved cases by code or initials only, with auto-delete after 30, 90 or 365 days.
- CSV and JSON export, JSON import for moving to a new phone.

Fits every screen
The result sits below the notch and the clock on every iPhone, the keypad stays pinned to the bottom, and the layout is tested on small phones, large phones and iPads in both orientations. Light and dark themes both meet contrast targets. Dynamic Type and VoiceOver are supported.

No ads. No account. Nothing leaves your phone.
There are no ads, no pop-ups and nothing to buy. Every feature is free. Datum makes no network connections, and your cases stay on your device unless you export them yourself.

Datum is a date calculator. It does not score tests, diagnose, or give medical advice, and it is not a medical device. Always check results against the manual for the test you are using.