Onsite gap “week start” calculation is overly complex and likely incorrect in some locales

[edunzer]

The logic calculates dayOfWeek using toStartOfWeek().daysBetween(date) + 1 and then uses a custom daysToMonday formula. This is fragile and can miscompute the Monday start depending on Apex toStartOfWeek() behavior and org locale settings.

How to fix: Use the platform’s toStartOfWeek() directly for the week start:

• onsiteGapWeekStart = input.onsiteStartDate.toStartOfWeek();
• onsiteGapWeekEnd = onsiteGapWeekStart.addDays(6);
  This is simpler and avoids off-by-N errors.

File: ScheduleHoursDistributor.cls (onsite gap block in generateCategoryScheduleExceptions)