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/**
* 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.
* All cards with `due < boundary` are considered due for the current study day.
*
* - If current time >= 3:00 AM, boundary = tomorrow 3:00 AM local time
* - If current time < 3:00 AM, boundary = today 3:00 AM local time
*/
export function getEndOfStudyDayBoundary(now: Date = new Date()): Date {
const boundary = new Date(now);
boundary.setMinutes(0, 0, 0);
if (boundary.getHours() >= 3) {
// Move to next day
boundary.setDate(boundary.getDate() + 1);
}
boundary.setHours(3);
return boundary;
}
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