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| author | nsfisis <nsfisis@gmail.com> | 2026-02-04 22:51:01 +0900 |
|---|---|---|
| committer | nsfisis <nsfisis@gmail.com> | 2026-02-04 22:51:01 +0900 |
| commit | 2d617f236fa3fbd39a0a7def23199a36cfa0b4c2 (patch) | |
| tree | f6c4afb9d1690e4ee821cb2795ec04e2de1879b8 /src/shared/date.ts | |
| parent | 62beeeab74b844b7a7819345c844114428450d96 (diff) | |
| download | kioku-2d617f236fa3fbd39a0a7def23199a36cfa0b4c2.tar.gz kioku-2d617f236fa3fbd39a0a7def23199a36cfa0b4c2.tar.zst kioku-2d617f236fa3fbd39a0a7def23199a36cfa0b4c2.zip | |
fix(study): use 3 AM boundary for counting today's new card reviews
countTodayNewCardReviews was using midnight (0:00) as the start of day,
inconsistent with the 3 AM study day boundary used elsewhere. Reviews
between 0:00-3:00 AM were incorrectly counted as the next day's budget.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Diffstat (limited to 'src/shared/date.ts')
| -rw-r--r-- | src/shared/date.ts | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/shared/date.ts b/src/shared/date.ts index 583d2a6..3b34f14 100644 --- a/src/shared/date.ts +++ b/src/shared/date.ts @@ -1,4 +1,25 @@ /** + * Returns the start-of-day boundary for the current study day. + * + * The "study day" is defined as 3:00 AM to the next day's 3:00 AM. + * + * - If current time >= 3:00 AM, start = today 3:00 AM local time + * - If current time < 3:00 AM, start = yesterday 3:00 AM local time + */ +export function getStartOfStudyDayBoundary(now: Date = new Date()): Date { + const boundary = new Date(now); + boundary.setMinutes(0, 0, 0); + + if (boundary.getHours() < 3) { + // Move to previous day + boundary.setDate(boundary.getDate() - 1); + } + + boundary.setHours(3); + return boundary; +} + +/** * Returns the end-of-day boundary for due card comparison. * * The "study day" is defined as 3:00 AM to the next day's 3:00 AM. |