Fix: Date Localization and Robust Format Detection for WhatsApp Chat Exports

examples/parser-tests/README.md

@@ -40,7 +40,43 @@ This directory contains WhatsApp chat export examples in various formats for tes
   - Japanese media indicators: `<メディアなし>`, `.jpg (ファイル添付)`
   - Japanese characters in usernames and messages
 
-### 5. `dash-format-test.txt`
+### 5. `asian-ampm-format-test.txt`
+- **Date Format**: `YYYY/MM/DD, HH:MM am/pm`
+- **Example**: `2024/12/01, 10:04 pm`
+- **Locale**: Year-first formats with 12-hour clock
+- **Features Tested**:
+   - Asian year-first date format with AM/PM
+   - Lowercase AM/PM (`am`, `pm`)
+   - Real-world export style from issue reports
+
+### 6. `european-ampm-format-test.txt`
+- **Date Format**: `DD/MM/YYYY, H:MM AM/PM`
+- **Example**: `23/06/2018, 1:55 p.m.`
+- **Locale**: Day-first formats with 12-hour clock
+- **Features Tested**:
+   - Day-first date with AM/PM
+   - AM/PM variants: `p.m.`, `p. m.`, uppercase/lowercase
+   - Compatibility with parser normalization of AM/PM tokens
+
+### 7. `dot-time-klo-format-test.txt`
+- **Date Format**: `DD.MM.YYYY klo HH.MM.SS` and `DD.MM.YY HH.MM.SS:`
+- **Example**: `13.6.2018 klo 21.25.15`
+- **Locale**: Finnish and dot-time variants
+- **Features Tested**:
+   - Finnish marker `klo`
+   - Time using dot separator (`HH.MM` and `HH.MM.SS`)
+   - Separator after timestamp using `:`
+
+### 8. `bracketed-year-first-test.txt`
+- **Date Format**: `[YYYY/MM/DD, HH:MM:SS]` and `[YYYY/MM/DD H:MM:SS AM/PM]`
+- **Example**: `[2018/06/13, 21:25:15]`
+- **Locale**: Year-first bracketed variants
+- **Features Tested**:
+   - Bracketed year-first format
+   - 24-hour and 12-hour variants
+   - AM/PM normalization inside brackets
+
+### 9. `dash-format-test.txt`
 - **Date Format**: `DD-MM-YYYY, HH:MM`
 - **Example**: `10-12-2024, 14:30`
 - **Locale**: Alternative European format
@@ -76,25 +112,47 @@ The parser supports the following date patterns:
    - Example: `2024/12/10, 14:30`
    - Year-first format (Japan, China, Korea)
 
-7. **Bracketed Format**: `[DD/MM/YY, HH:MM:SS]`
+7. **Asian Format (12h)**: `YYYY/MM/DD, HH:MM AM/PM`
+   - Example: `2024/12/01, 10:04 pm`
+   - Year-first format with 12-hour clock
+   - Supports uppercase and lowercase AM/PM
+
+8. **European/Brazilian Format (12h)**: `DD/MM/YY, H:MM AM/PM`
+   - Example: `23/06/2018, 1:55 p.m.`
+   - Day-first format with 12-hour clock
+   - Supports `AM`, `PM`, `a.m.`, `p.m.`, and `p. m.` variants
+
+9. **Bracketed Format**: `[DD/MM/YY, HH:MM:SS]`
    - Example: `[10/12/24, 14:30:45]`
    - Some older WhatsApp versions
 
-8. **iOS Bracketed Format (12h)**: `[DD/MM/YYYY, HH:MM:SS AM/PM]`
+10. **iOS Bracketed Format (12h)**: `[DD/MM/YYYY, HH:MM:SS AM/PM]`
    - Example: `[13/11/2025, 12:25:55 PM]`
    - iOS WhatsApp exports
    - Uses 12-hour format with AM/PM
    - May contain Unicode whitespace (U+202F) before AM/PM
    - File typically named `_chat.txt` (with underscore prefix)
 
+11. **Bracketed Year-First Format**: `[YYYY/MM/DD, HH:MM:SS]`
+   - Example: `[2018/06/13, 21:25:15]`
+   - Supports both 24-hour and AM/PM variants
+
+12. **Dot-Time + Finnish `klo`**: `DD.MM.YYYY klo HH.MM.SS`
+   - Example: `13.6.2018 klo 21.25.15`
+   - Dot-separated time normalized for parsing
+
 ## Test Files
 
 ### 1. `german-format-test.txt` (see above)
 ### 2. `spanish-format-test.txt` (see above)
 ### 3. `french-format-test.txt` (see above)
 ### 4. `asian-format-test.txt` (see above)
-### 5. `dash-format-test.txt` (see above)
-### 6. `ios-format-test.txt`
+### 5. `asian-ampm-format-test.txt` (see above)
+### 6. `european-ampm-format-test.txt` (see above)
+### 7. `dot-time-klo-format-test.txt` (see above)
+### 8. `bracketed-year-first-test.txt` (see above)
+### 9. `dash-format-test.txt` (see above)
+### 10. `ios-format-test.txt`
 - **Date Format**: `[DD/MM/YYYY, HH:MM:SS AM/PM]`
 - **Example**: `[13/11/2025, 12:25:55 PM]`
 - **Locale**: iOS (all locales)

examples/parser-tests/asian-ampm-format-test.txt

@@ -0,0 +1,5 @@
+2024/12/01, 10:04 pm - Alice: Messages and calls are end-to-end encrypted. Only people in this chat can read, listen to, or share them. Learn more.
+2024/12/01, 10:05 pm - Alice: Hello there
+2024/12/01, 10:06 pm - Bob: Hi!
+2024/12/01, 10:07 pm - Alice: <Media omitted>
+2024/12/01, 10:08 pm - Bob: Nice

examples/parser-tests/bracketed-year-first-test.txt

@@ -0,0 +1,3 @@
+[2018/06/13, 21:25:15] Ana: mensagem com colchetes
+[2018/06/13 1:55:00 p. m.] Bruno: ampm com espaços
+[2018/06/13, 01:56:00 AM] Ana: uppercase também funciona

examples/parser-tests/dot-time-klo-format-test.txt

@@ -0,0 +1,3 @@
+13.6.2018 klo 21.25.15 - Mika: tämä on testi
+13.06.18 21.25.15: Laura: tämä on toinen testi
+13.06.2018, 21.25 - Mika: ilman sekunteja

examples/parser-tests/european-ampm-format-test.txt

@@ -0,0 +1,4 @@
+23/06/2018, 1:55 p.m. - Loris: one
+23/06/2018, 1:56 p. m. - Luke: two
+23/06/2018, 1:57 PM - Loris: three
+23/06/2018, 1:58 am - Luke: four

src/lib/components/MediaGallery.svelte

@@ -696,13 +696,13 @@ onDestroy(() => {
 						<Icon name="close" size="md" />
 					</IconButton>
 				</div>
-				
+
 				<DropdownSearch
 					bind:value={participantSearchQuery}
 					bind:ref={participantSearchInputRef}
 					placeholder={m.media_gallery_participant_search_placeholder()}
 				/>
-				
+
 				<div class="max-h-80 overflow-y-auto py-2">
 					{#each filteredMediaParticipants as participant (participant)}
 						<ListItemButton
@@ -811,7 +811,7 @@ onDestroy(() => {
 							{/if}
 							·
 							{#if lightboxItem.messageTimestamp}
-								{new Date(lightboxItem.messageTimestamp).toLocaleString()}
+								{new Date(lightboxItem.messageTimestamp).toLocaleString(getLocale())}
 							{:else}
 								{m.media_gallery_unknown_date()}
 							{/if}