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This commit introduces the UTC Anchor principle to eliminate timezone-related bugs and provide consistent date handling across all user timezones. ## Key Changes: ### Core Implementation - Add `parseDateToUTC()` function that creates UTC anchors for date-only strings - Add `parseDateToLocal` alias for existing `parseDate` function - Deprecate direct `parseDate` usage with clear migration path - Update date comparison functions to use UTC anchors ### Updated Components - **dateUtils.ts**: New UTC parsing functions and updated comparisons - **main.ts**: Use UTC anchor for selectedDate initialization - **MiniCalendarView**: Navigate using UTC anchors - **TimeblockCreationModal**: Fix timezone handling - **Multiple test files**: Fix timezone assumptions in tests ### Refactored parseDate Usage - **UnscheduledTasksSelectorModal**: Use parseDateToLocal for UI display - **AdvancedCalendarView**: Use parseDateToLocal for calendar events - **helpers.ts**: Use parseDateToUTC for internal date logic - **FilterService**: Already using updated utilities ### Documentation - Add comprehensive UTC Anchor implementation docs - Update development guidelines with date handling best practices - Add migration guide for existing code - Include quick reference for date functions ## Benefits: - Eliminates "off-by-one day" errors across timezones - Provides consistent sorting and filtering behavior - Simplifies date comparison logic - Future-proofs against timezone-related bugs ## Testing: - All 798 tests passing - New UTC anchor test suite (11 tests) - No regression in existing functionality Fixes #327, #322, #314 and other timezone-related issues |
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