fix(locale): use Japanese date formats for the ja locale (#977)

Co-authored-by: greymoth <246701683+greymoth-jp@users.noreply.github.com>

Author: greymoth-jp

src/pendulum/locales/ja/custom.py

@@ -13,11 +13,11 @@
     "before": "{0} 前",
     # Date formats
     "date_formats": {
-        "LTS": "h:mm:ss A",
-        "LT": "h:mm A",
-        "L": "MM/DD/YYYY",
-        "LL": "MMMM D, YYYY",
-        "LLL": "MMMM D, YYYY h:mm A",
-        "LLLL": "dddd, MMMM D, YYYY h:mm A",
+        "LTS": "HH:mm:ss",
+        "LT": "HH:mm",
+        "L": "YYYY/MM/DD",
+        "LL": "YYYY年M月D日",
+        "LLL": "YYYY年M月D日 HH:mm",
+        "LLLL": "YYYY年M月D日 dddd HH:mm",
     },
 }

tests/formatting/test_formatter.py

@@ -250,6 +250,13 @@ def test_date_formats():
     assert f.format(d, "LLL", locale="fr") == "28 août 2016 07:03"
     assert f.format(d, "LLLL", locale="fr") == "dimanche 28 août 2016 07:03"
 
+    assert f.format(d, "LT", locale="ja") == "07:03"
+    assert f.format(d, "LTS", locale="ja") == "07:03:06"
+    assert f.format(d, "L", locale="ja") == "2016/08/28"
+    assert f.format(d, "LL", locale="ja") == "2016年8月28日"
+    assert f.format(d, "LLL", locale="ja") == "2016年8月28日 07:03"
+    assert f.format(d, "LLLL", locale="ja") == "2016年8月28日 日曜日 07:03"
+
 
 def test_escape():
     f = Formatter()