At 21:12 "напомни мне завтра в семь позвонить маме" confirmed a reminder for
21:12 tomorrow. The hour was dropped and the wall clock carried onto the named
day. She did not ask; she named a time nobody gave her, on a path that fires.
A bare "напомни в семь" declines correctly, so adding "завтра" turned a decline
into an invented answer.
dateparser only reads a bare hour when it carries a qualifier or a colon.
"завтра в 7" keeps the current clock and "завтра в 7 часов" is read as seven
hours from now, which moves the day as well. English "at 7" fails identically,
so this is not a Russian defect and both prepositions are rewritten.
The script now gives it the colon: "в 7", "в 7 часов" and "at 7" become
"в 07:00" beside the existing утра/вечера rewrites. A duration is untouched,
because "через 2 часа" has no preposition to match, and so are "в 7:30",
"в 30 минут" and "в 2026 году".
The stub parser has always read the token after the day word, so the floor was
right and the production parser was not. No test on the stub could have caught
this. The four new cases are in TestPythonDateParser, which runs where
dateparser is installed.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SoL7EBdYC5Mhz3DJd49GJy
PythonDateParser shells out to python3 with the dateparser library for
full natural-language date/time extraction. Two-step approach:
1. search_dates() finds the date substring in surrounding text
2. parse() re-parses the substring for correct time resolution
Russian time qualifiers (утра/вечера/дня/ночи) are pre-processed to
AM/PM before parsing — dateparser drops them during substring extraction.
Falls back to StubDateTimeParser when python3 or dateparser isn't
available (graceful degradation, no hard runtime dependency).
Dockerfile updated: python3 + dateparser==1.4.1 in runtime stage.
claude
kami