Support BCE / CE times

src/NodaTimeSplitter.php

@@ -66,6 +66,8 @@ final class NodaTimeSplitter {
         // To clean
         "v.Chr." => "v. Chr.",
         "v. Chr" => "v. Chr.",
+        "BCE" => "v. Chr.",
+        "CE" => "",
         "vor Christus" => "v. Chr.",
     ];
 
@@ -399,7 +401,7 @@ final class NodaTimeSplitter {
 
         $datum = self::clean_input($datum);
 
-        if (\preg_match("/\ v\.\ Chr\.$/", $datum)) {
+        if (\str_ends_with($datum, ' v. Chr.')) {
             if ($output = self::attempt_splitting(\substr($datum, 0, -8))) {
                 $start = \strval(-1 * \intval($output[1]));
                 $end = \strval(-1 * \intval($output[0]));