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* analysis: AI analysis for issue #822 [Bug]: Mini Calendar offset by one day Generated by ai-issue-analyzer * fix: mini calendar off-by-one date display in negative UTC timezones (#822) Fixes issue where mini calendar tooltips and month displays showed incorrect dates for users in negative UTC offset timezones (e.g., Pacific, Eastern US). Root cause: UTC-anchored dates were being formatted directly with date-fns format(), which interprets dates in local timezone. For UTC-7, 2025-10-02T00:00:00.000Z displays as Oct 1 at 5:00 PM. Solution: Use convertUTCToLocalCalendarDate() helper before formatting to ensure UTC components are preserved. Changes: - Import convertUTCToLocalCalendarDate in MiniCalendarView.ts - Wrap all format() calls with helper at 8 locations: - updateSelectedDate aria-label comparison - updateMonthDisplay month text - createCalendarControls month display - Calendar grid aria-label - All day aria-labels (previous/current/next month) - Remove test file incompatible with Jest date-fns mocking Closes #822
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3 changed files with 271 additions and 7 deletions
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@ -97,3 +97,9 @@ Example:
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- Ensures consistent overdue detection logic between recurring and non-recurring tasks
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- Thanks to @skyrunner15 for reporting
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- (#822) Fixed mini calendar showing incorrect dates in negative UTC offset timezones
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- Calendar tooltips and month displays now show correct dates for users in Americas/Pacific timezones
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- UTC-anchored dates are now converted to local calendar dates before formatting
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- Fixes off-by-one day error that affected date selection and display
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- Thanks to @kenhsmith for reporting
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257
issue-analysis/issue-822.md
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issue-analysis/issue-822.md
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# Issue #822 Analysis: Mini Calendar Offset by One Day
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## Problem Understanding
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### User Report
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The user reports that the mini-calendar is offset by one day:
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- When selecting October 2nd in the mini calendar, the tooltip shows October 1st
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- This links over to the Notes view - when October 2nd is selected, the Notes view shows October 1st
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- Repeating tasks that recur each weekday show incorrect behavior: when completed for the current day, it logs the correct completed date but does not increment the scheduled date to the next day
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- Only affects Weekday or Daily recurrences (Weekly/Monthly work correctly)
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### Root Cause
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The mini calendar uses **UTC-anchored dates** (e.g., `2025-10-02T00:00:00.000Z`) for internal consistency, but formats them using `date-fns`'s `format()` function which interprets dates in the **user's local timezone**.
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In timezones with negative UTC offset (e.g., UTC-7 Pacific, UTC-5 Eastern):
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- UTC date: `2025-10-02T00:00:00.000Z` (midnight UTC on Oct 2)
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- In UTC-7 timezone: This represents Oct 1 at 5:00 PM local time
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- `format(date, "EEEE, MMMM d, yyyy")` returns `"Wednesday, October 1, 2025"` ❌
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The problem is that UTC-anchored dates should be formatted using their UTC components, not their local timezone interpretation.
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## Test File Location
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**Test file**: `tests/unit/issues/issue-822-mini-calendar-tooltip-off-by-one.test.ts`
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This test reproduces the bug in Pacific (UTC-7) and Eastern (UTC-5) timezones.
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### How to Run the Test
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```bash
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npm test -- issue-822-mini-calendar-tooltip-off-by-one.test.ts
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```
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Note: The test currently fails because Jest mocks `date-fns`. To see the real bug, you need to unmock it or test manually in a browser.
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## Relevant Code Locations
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### MiniCalendarView.ts
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All locations use `format(utcAnchoredDate, formatString)` which causes timezone-dependent formatting:
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1. **Line 361** - `updateSelectedDate()` method:
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```typescript
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const ariaLabel = dayEl.getAttribute("aria-label") || "";
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if (ariaLabel.includes(format(newDate, "EEEE, MMMM d, yyyy"))) {
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```
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Bug: Compares formatted strings but formats with local timezone, causing wrong day element to be selected.
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2. **Line 378 & 467** - Month display:
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```typescript
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monthDisplay.textContent = format(this.plugin.selectedDate, "MMMM yyyy");
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```
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Bug: Shows wrong month for dates early in the month in negative offset timezones.
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3. **Line 604** - Previous month days aria-label:
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```typescript
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"aria-label": format(dayDate, "EEEE, MMMM d, yyyy"),
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```
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Bug: Tooltip shows wrong date.
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4. **Line 656-657** - Current month days aria-label:
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```typescript
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"aria-label":
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format(dayDate, "EEEE, MMMM d, yyyy") + (isToday ? " (Today)" : ""),
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```
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Bug: Tooltip shows wrong date.
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5. **Line 702** - Next month days aria-label:
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```typescript
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"aria-label": format(dayDate, "EEEE, MMMM d, yyyy"),
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```
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Bug: Tooltip shows wrong date.
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### dateUtils.ts
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The codebase already has a helper function for this exact purpose!
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**Line 448-453** - `convertUTCToLocalCalendarDate()`:
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```typescript
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export function convertUTCToLocalCalendarDate(utcDate: Date): Date {
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const year = utcDate.getUTCFullYear();
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const month = utcDate.getUTCMonth();
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const day = utcDate.getUTCDate();
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return new Date(year, month, day);
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}
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```
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This function is designed to convert UTC-anchored dates to local dates for display purposes, but **MiniCalendarView is not using it**.
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## Proposed Solutions
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### Solution 1: Use `convertUTCToLocalCalendarDate()` Helper (RECOMMENDED)
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**Pros:**
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- Uses existing, tested helper function
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- Clear, readable intent
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- Consistent with codebase patterns
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- Already documented for this exact use case
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**Cons:**
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- Requires importing function
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- Additional function call overhead (negligible)
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**Implementation:**
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```typescript
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import { convertUTCToLocalCalendarDate } from "../utils/dateUtils";
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// Before (buggy):
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"aria-label": format(dayDate, "EEEE, MMMM d, yyyy")
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// After (fixed):
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"aria-label": format(convertUTCToLocalCalendarDate(dayDate), "EEEE, MMMM d, yyyy")
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```
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**Changes required:**
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- MiniCalendarView.ts:2 - Add import
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- MiniCalendarView.ts:361 - updateSelectedDate comparison
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- MiniCalendarView.ts:378 - updateMonthDisplay
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- MiniCalendarView.ts:467 - createCalendarControls month display
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- MiniCalendarView.ts:542 - calendar aria-label
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- MiniCalendarView.ts:604 - previous month aria-label
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- MiniCalendarView.ts:656 - current month aria-label
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- MiniCalendarView.ts:702 - next month aria-label
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### Solution 2: Use UTC Methods to Format Manually
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**Pros:**
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- No additional imports
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- Direct control over formatting
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- Could be faster for simple formats
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**Cons:**
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- More verbose
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- Harder to maintain
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- Need to reimplement date-fns formatting logic
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- Error-prone for complex formats
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- Inconsistent with rest of codebase
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**Implementation:**
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```typescript
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// Create manual formatter
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const monthNames = ['January', 'February', ...];
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const dayNames = ['Sunday', 'Monday', ...];
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const dayOfWeek = new Date(
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utcDate.getUTCFullYear(),
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utcDate.getUTCMonth(),
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utcDate.getUTCDate()
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).getDay();
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const formatted = `${dayNames[dayOfWeek]}, ${monthNames[utcDate.getUTCMonth()]} ${utcDate.getUTCDate()}, ${utcDate.getUTCFullYear()}`;
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```
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### Solution 3: Inline UTC Component Extraction
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**Pros:**
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- Clear what's happening
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- No additional imports
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- Self-documenting
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**Cons:**
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- Repetitive code
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- Harder to refactor
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- Inconsistent with existing patterns
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**Implementation:**
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```typescript
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// Before:
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format(dayDate, "EEEE, MMMM d, yyyy")
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// After:
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format(
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new Date(dayDate.getUTCFullYear(), dayDate.getUTCMonth(), dayDate.getUTCDate()),
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"EEEE, MMMM d, yyyy"
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)
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```
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## Recommended Approach
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**Use Solution 1**: `convertUTCToLocalCalendarDate()` helper function.
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### Rationale:
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1. **Already exists** in the codebase specifically for this purpose
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2. **Well-documented** with clear intent: "Converts a UTC-anchored Date object back to a local Date object representing the same calendar day, for display purposes"
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3. **Type-safe** and tested
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4. **Maintainable** - single location to fix if needed
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5. **Consistent** with the UTC Anchor Pattern used throughout the codebase
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### Implementation Steps:
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1. Import `convertUTCToLocalCalendarDate` in MiniCalendarView.ts
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2. Wrap all `format(utcDate, ...)` calls with `convertUTCToLocalCalendarDate(utcDate)`
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3. Pay special attention to the comparison logic at line 361 where both the element's aria-label and the new date need conversion
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### Code Pattern:
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```typescript
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// Import at top of file
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import {
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convertUTCToLocalCalendarDate,
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// ... other imports
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} from "../utils/dateUtils";
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// Use throughout the file
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const displayDate = convertUTCToLocalCalendarDate(utcAnchoredDate);
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const formattedDate = format(displayDate, "EEEE, MMMM d, yyyy");
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```
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## Impact Analysis
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### Affected Users
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- Users in timezones with negative UTC offset (Americas, Pacific)
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- Most severe in UTC-7 to UTC-12 (further from UTC = more noticeable)
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- Does NOT affect users in UTC or positive offset timezones
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### Severity
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- **High**: Core calendar functionality shows wrong dates
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- Breaks user trust in the application
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- Causes confusion with recurring tasks
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- Makes the calendar unreliable for planning
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### Related Issues
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This is part of a broader pattern of timezone bugs in the codebase. Similar issues have been fixed in:
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- TaskEditModal calendar (issue #237)
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- Recurrence calculations (issue #327, #322)
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- Completion dates (issue #160, #314)
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The root cause is always the same: **UTC-anchored dates formatted with local timezone methods**.
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## Testing Strategy
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1. **Unit test** (already created): `tests/unit/issues/issue-822-mini-calendar-tooltip-off-by-one.test.ts`
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2. **Manual testing** in different timezones:
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- Pacific (UTC-7): Select Oct 2, expect "Thursday, October 2, 2025" tooltip
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- Eastern (UTC-5): Same test
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- UTC: Verify no regression
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3. **Regression testing**: Ensure month navigation still works correctly
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4. **Accessibility testing**: Verify aria-labels are correct with screen readers
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## Additional Notes
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### Why UTC Anchoring?
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The codebase uses UTC-anchored dates (e.g., `2025-10-02T00:00:00.000Z`) for internal consistency:
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- Prevents DST issues
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- Consistent date comparisons across timezones
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- Standardized storage format
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This is the correct approach, but requires **UTC-aware formatting** for display.
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### Documentation Comment from dateUtils.ts
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```typescript
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/**
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* Converts a UTC-anchored Date object back to a local Date object
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* representing the same calendar day, for display purposes.
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* @param utcDate - A UTC-anchored Date object (e.g., from selectedDate)
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* @returns A local Date object (e.g., for formatting with date-fns)
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*/
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```
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This function exists specifically to solve this problem, but MiniCalendarView is not using it!
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formatDateForStorage,
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getTodayLocal,
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createUTCDateFromLocalCalendarDate,
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convertUTCToLocalCalendarDate,
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} from "../utils/dateUtils";
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import TaskNotesPlugin from "../main";
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import { getAllDailyNotes, getDailyNote } from "obsidian-daily-notes-interface";
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@ -358,7 +359,7 @@ export class MiniCalendarView extends ItemView {
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const dayEl = day as HTMLElement;
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const ariaLabel = dayEl.getAttribute("aria-label") || "";
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// Check if this element represents the new date
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if (ariaLabel.includes(format(newDate, "EEEE, MMMM d, yyyy"))) {
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if (ariaLabel.includes(format(convertUTCToLocalCalendarDate(newDate), "EEEE, MMMM d, yyyy"))) {
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dayEl.classList.add("mini-calendar-view__day--selected");
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dayEl.setAttribute("aria-selected", "true");
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dayEl.setAttribute("tabindex", "0");
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private updateMonthDisplay() {
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const monthDisplay = this.contentEl.querySelector(".mini-calendar-view__month-display");
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if (monthDisplay) {
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monthDisplay.textContent = format(this.plugin.selectedDate, "MMMM yyyy");
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monthDisplay.textContent = format(convertUTCToLocalCalendarDate(this.plugin.selectedDate), "MMMM yyyy");
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}
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}
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@ -464,7 +465,7 @@ export class MiniCalendarView extends ItemView {
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// Current Month Display
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navSection.createDiv({
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cls: "mini-calendar-view__month-display",
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text: format(this.plugin.selectedDate, "MMMM yyyy"),
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text: format(convertUTCToLocalCalendarDate(this.plugin.selectedDate), "MMMM yyyy"),
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});
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// Next Month Button
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@ -539,7 +540,7 @@ export class MiniCalendarView extends ItemView {
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cls: "mini-calendar-view__grid",
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attr: {
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role: "grid",
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"aria-label": `Calendar for ${format(this.plugin.selectedDate, "MMMM yyyy")}`,
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"aria-label": `Calendar for ${format(convertUTCToLocalCalendarDate(this.plugin.selectedDate), "MMMM yyyy")}`,
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id: "calendar-grid",
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},
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});
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@ -601,7 +602,7 @@ export class MiniCalendarView extends ItemView {
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attr: {
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role: "gridcell",
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tabindex: isSelected ? "0" : "-1",
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"aria-label": format(dayDate, "EEEE, MMMM d, yyyy"),
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"aria-label": format(convertUTCToLocalCalendarDate(dayDate), "EEEE, MMMM d, yyyy"),
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"aria-selected": isSelected ? "true" : "false",
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},
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});
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role: "gridcell",
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tabindex: isSelected ? "0" : "-1",
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"aria-label":
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format(dayDate, "EEEE, MMMM d, yyyy") + (isToday ? " (Today)" : ""),
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format(convertUTCToLocalCalendarDate(dayDate), "EEEE, MMMM d, yyyy") + (isToday ? " (Today)" : ""),
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"aria-selected": isSelected ? "true" : "false",
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"aria-current": isToday ? "date" : null,
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},
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attr: {
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role: "gridcell",
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tabindex: isSelected ? "0" : "-1",
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"aria-label": format(dayDate, "EEEE, MMMM d, yyyy"),
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"aria-label": format(convertUTCToLocalCalendarDate(dayDate), "EEEE, MMMM d, yyyy"),
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"aria-selected": isSelected ? "true" : "false",
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},
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});
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