[Intl] Support time in generated data in currencies validity

Author: Crovitche-1623

Data/Generator/CurrencyDataGenerator.php

@@ -167,11 +167,11 @@ private function generateCurrencyMap(mixed $supplementalDataBundle): array
                 }
 
                 if (\array_key_exists('from', $metadata)) {
-                    $metadata['from'] = self::icuPairToDate($metadata['from']);
+                    $metadata['from'] = self::icuPairToDatetimeString($metadata['from']);
                 }
 
                 if (\array_key_exists('to', $metadata)) {
-                    $metadata['to'] = self::icuPairToDate($metadata['to']);
+                    $metadata['to'] = self::icuPairToDatetimeString($metadata['to']);
                 }
 
                 if (\array_key_exists('tender', $metadata)) {
@@ -229,7 +229,7 @@ private function generateNumericToAlpha3Mapping(array $alpha3ToNumericMapping):
      *
      * @param array{0: int, 1: int} $pair
      */
-    private static function icuPairToDate(array $pair): string
+    private static function icuPairToDatetimeString(array $pair): string
     {
         [$highBits32, $lowBits32] = $pair;
 
@@ -245,12 +245,13 @@ private static function icuPairToDate(array $pair): string
             --$seconds;
         }
 
-        $datetime = \DateTimeImmutable::createFromFormat('U', $seconds, new \DateTimeZone('Etc/UTC'));
+        // Note: Unlike the XML files, the date pair is already in UTC.
+        $datetime = \DateTimeImmutable::createFromFormat('U', (string) $seconds, new \DateTimeZone('Etc/UTC'));
 
         if (false === $datetime) {
             throw new \RuntimeException('Unable to parse ICU milliseconds pair.');
         }
 
-        return $datetime->format('Y-m-d');
+        return $datetime->format('Y-m-d\TH:i:s');
     }
 }