From 9c2eaa2929f389aeea98aeaf702bc46a03534c9e Mon Sep 17 00:00:00 2001
From: Joshua Ramon Enslin <joshua@museum-digital.de>
Date: Wed, 15 Jan 2025 10:35:35 +0100
Subject: [PATCH] Allow splitting 1945-48

---
 src/NodaTimeSplitter.php       | 12 ++++++++++--
 tests/NodaTimeSplitterTest.php | 13 +++++++++++++
 2 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/src/NodaTimeSplitter.php b/src/NodaTimeSplitter.php
index e691ce3..c946744 100644
--- a/src/NodaTimeSplitter.php
+++ b/src/NodaTimeSplitter.php
@@ -590,10 +590,18 @@ final class NodaTimeSplitter {
             return NodaSplitTime::genExactDate($year, $month, $day);
         }
         // Intl': 2020-12
-        if (\preg_match("/^[0-9]{4}\-[0-9]{2}$/", $datum)) { // German Y-m
+        if (\preg_match("/^[0-9]{4}\-[0-9]{2}$/", $datum)) { // German Y-m or 1912-15
             $year = \substr($datum, 0, 4);
             $month = \substr($datum, 5, 2);
-            return new NodaSplitTime($year, $year, $month);
+
+            // Assume the end is a month
+            if (intval($month) < 12) {
+                return new NodaSplitTime($year, $year, $month);
+            }
+            else {
+                $end = \substr($year, 0, 2) . $month;
+                return new NodaSplitTime($year, $end);
+            }
         }
 
         // German MM.JJJJ
diff --git a/tests/NodaTimeSplitterTest.php b/tests/NodaTimeSplitterTest.php
index 0547bd0..0b3dc22 100644
--- a/tests/NodaTimeSplitterTest.php
+++ b/tests/NodaTimeSplitterTest.php
@@ -450,6 +450,19 @@ final class NodaTimeSplitterTest extends TestCase {
         self::assertEquals($output->toTimeName(), "1901-2000");
         self::assertEquals(NodaTimeSplitter::timePartsToCountingYear($output), 1951);
 
+        $output = NodaTimeSplitter::attempt_splitting("1945-48");
+        self::assertNotEmpty($output);
+        self::assertEquals($output->toOldFormat(), [
+            0 => "1945",
+            1 => "1948",
+            2 => "00",
+            3 => "00",
+            4 => "+",
+            5 => "",
+        ]);
+        self::assertEquals($output->toTimeName(), "1945-1948");
+        self::assertEquals(NodaTimeSplitter::timePartsToCountingYear($output), 1947);
+
         $output = NodaTimeSplitter::attempt_splitting("20.-19. Jahrhundert v. Chr.");
         self::assertNotEmpty($output);
         self::assertEquals($output->toOldFormat(), [