Dates in old records
Open a church book from 1782 and you won't find "21 April". You'll find "Dominica III post Pascha" — the third Sunday after Easter. Genealogy software usually forces you to translate that into a modern date and throw the original away. StemmaFiles does the opposite: write what the scribe wrote, and let the app do the math.
Feast-day dates
Type Dominica III post Pascha 1782 into a date field and the editor's feedback line tells you, as you type, that this resolves to 21 April 1782 — Easter that year fell where it fell, and the app carries the whole paschal arithmetic inside. Latin and Polish forms both work, movable feasts (everything anchored to Easter) and fixed ones alike.
Your note keeps the original wording, exactly as written. The resolved day is used where it helps: sorting events, placing the pin on the map's time slider, showing the anniversary.
Double years
Before the calendar reforms settled, a date in the gap between January and March was often written with both years: 1 Mar 1740/41. StemmaFiles understands the notation, keeps it verbatim, and sorts it under the year the historian means (1741). No more silently mangled "1740-41" ranges.
Uncertain, partial, local
ABT 1850,BET 1850 AND 1860, a bare1888— all fine. Approximate stays approximate; nothing forces a fake precision.- Polish month names and European dotted dates (
12.03.1805) are read correctly on import. - Everything you type stays in your files exactly as typed — the resolved form is derived, never stored over your words.
On this day
The Anniversaries panel turns dates back into life: a month grid of births and deaths, and — if you enable church feasts in Settings — the feast days marked on their dates, so "born on St. Michael's" stops being a puzzle.
Why this matters beyond dates
The year the app derives is what the map's time slider, the timeline and the year snapshot all read — one rule, everywhere. So a person whose birth you only know as "Dominica in Albis 1799" still stands in the right year on every view, while your vault keeps the words their priest actually wrote.