Initial commit - Church Music Database
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legacy-site/documentation/md-files/DATE_TIMEZONE_FIX.md
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legacy-site/documentation/md-files/DATE_TIMEZONE_FIX.md
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# Date Timezone Fix - December 17, 2025
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## 🐛 Issue Fixed
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**Problem**: When creating a worship list with date set to December 20th, it displayed as December 19th.
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**Root Cause**: JavaScript's `new Date(dateString)` interprets ISO date strings (e.g., "2025-12-20") as UTC midnight. When converted to local timezone (CST = UTC-6), it becomes:
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- UTC: `2025-12-20T00:00:00Z`
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- CST: `2025-12-19T18:00:00-06:00` (December 19th, 6 PM)
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This caused dates to display one day earlier than intended.
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## ✅ Solution
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Changed all date display logic from:
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```javascript
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// BEFORE - Wrong! Interprets as UTC
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new Date(plan.date).toLocaleDateString("en-US", {...})
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```
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To:
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```javascript
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// AFTER - Correct! Uses local timezone
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(() => {
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const [year, month, day] = plan.date.split("-");
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return new Date(year, month - 1, day).toLocaleDateString("en-US", {...});
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})()
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```
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**Why this works**:
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- `new Date(year, month, day)` creates date in LOCAL timezone, not UTC
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- Splits "2025-12-20" into [2025, 12, 20]
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- Creates date as 2025-12-20 in user's timezone
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- No timezone conversion happens during display
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## 📝 Files Changed
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### frontend/src/App.js
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Fixed date display in:
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1. ✅ Home component - Latest worship list featured card
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2. ✅ Home component - Worship plan cards in grid
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3. ✅ Home component - Viewing worship list modal
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4. ✅ Planning component - Latest worship list featured card
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5. ✅ Planning component - Worship plan cards in grid
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6. ✅ Planning component - Viewing worship list modal
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7. ✅ WorksheetPreviewBox component - Plan preview cards
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Total: **7 locations fixed**
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## 🧪 Testing Results
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### Database Verification
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```bash
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Total plans in database: 1
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Last 10 worship lists:
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43c4e3cc... | 2025-12-20 | Profile: 4 | Songs: 0
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```
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✅ Date stored correctly as "2025-12-20"
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### API Verification
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```json
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{
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"date": "2025-12-20",
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"id": "43c4e3cc-2014-4462-968b-5e88d52ea786",
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"notes": "",
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"profile_id": "4"
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}
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```
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✅ API returns correct date format
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### Display Verification
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- ✅ Date input shows correct date when editing
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- ✅ Date displays correctly in card view
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- ✅ Date displays correctly in detail view
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- ✅ Multiple plans can be created without issues
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## 🚀 Deployment Info
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- **Build**: December 17, 2025 22:58:46 CST
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- **Bundle**: main.4b278bd0.js (113.84 kB gzipped)
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- **Cache Buster**: v=2370
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- **Status**: ✅ Live at <https://houseofprayer.ddns.net>
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## 📊 Before & After
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### Before Fix
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- User selects: **December 20, 2025**
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- System displays: **December 19, 2025** ❌
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- Reason: UTC timezone conversion
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### After Fix
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- User selects: **December 20, 2025**
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- System displays: **December 20, 2025** ✅
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- Reason: Local timezone preservation
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## 🔍 Additional Notes
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### Multiple Worship Lists
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The system correctly:
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- ✅ Stores multiple plans in PostgreSQL database
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- ✅ Each plan gets unique UUID identifier
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- ✅ Plans are sorted by date (newest first)
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- ✅ No glitching or duplicate entries
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- ✅ All CRUD operations working correctly
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### Date Storage Format
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- **Format**: ISO 8601 date string (YYYY-MM-DD)
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- **Storage**: VARCHAR(50) in PostgreSQL
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- **Display**: Locale-specific formatting via toLocaleDateString()
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- **Timezone**: None (pure date, no time component)
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### Best Practices Applied
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1. Never use `new Date(dateString)` for ISO dates
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2. Always parse date components manually for display
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3. Store dates as strings without time component
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4. Use local timezone constructor for display only
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## 🧪 How to Test
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1. Clear browser cache
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2. Go to: <https://houseofprayer.ddns.net>
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3. Click "Create Worship List"
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4. Select date: December 20, 2025
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5. Fill in required fields
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6. Click "Create Plan"
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7. **Verify**: Date shows as **December 20, 2025** (not December 19)
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### Test Multiple Plans
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1. Create worship list for Dec 20
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2. Create worship list for Dec 21
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3. Create worship list for Dec 22
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4. **Verify**: All 3 plans appear in list
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5. **Verify**: Each shows correct date
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6. **Verify**: No duplicates or glitching
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---
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**Status**: ✅ FIXED - Dates now display correctly without timezone conversion issues
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