#139: Additional valid EDTF inputs

Author: xurizaemon

tests/src/Kernel/EDTFFormatterTest.php

@@ -158,26 +158,37 @@ public function testDateFormatting(string $input, string $expected) {
    */
   public function edtfDateFormatProvider(): array {
     return [
-      // Basic single dates.
-      'Full date' => [
-        'input' => '1996-04-22',
-    // Default format.
-        'expected' => '1996-04-22',
+      // EDTF Level 0
+      'Date - complete' => [
+        'input' => '1985-04-12',
+        'expected' => '1985-04-12',
       ],
-      'Year' => [
-        'input' => '1975',
-        'expected' => '1975',
+      'Date - reduced precision - year and month' => [
+        'input' => '1985-04',
+        'expected' => '1985-04',
       ],
-      'Year-month' => [
-        'input' => '2025-02',
-        'expected' => '2025-02',
+      'Date - reduced precision - year' => [
+        'input' => '1985',
+        'expected' => '1985',
       ],
-      'Date and time (no TZ)' => [
+      'Date and time - local' => [
         'original' => '2024-10-15T12:00:00',
         'formatted' => '2024-10-15 12:00:00',
       ],
+      'Date and time - Z' => [
+        'original' => '1985-04-12T23:20:30Z',
+        'formatted' => '1985-04-12 23:20:30Z',
+      ],
+      'Date and time - shift in hours' => [
+        'original' => '1985-04-12T23:20:30+04',
+        'formatted' => '1985-04-12 23:20:30+04',
+      ],
+      'Date and time - shift in hours and minutes' => [
+        'original' => '1985-04-12T23:20:30+04:30',
+        'formatted' => '1985-04-12 23:20:30+04:30',
+      ],
 
-      // Uncertain/approximate dates.
+      // EDTF level 1
       'Uncertain year' => [
         'input' => '1984?',
         'expected' => '1984 (year uncertain)',
@@ -198,6 +209,10 @@ public function edtfDateFormatProvider(): array {
         'original' => '2024-10',
         'formatted' => '2024-10',
       ],
+      'Unspecified digits from right' => [
+        'input' => '198X',
+        'expected' => 'Unknown year in the decade of the 1980s',
+      ],
 
       // Invalid/edge cases
       'Empty input' => [