Add date format and respective test case (#9310)

* Added date format and respective test case * add test for negative values as well fix checkstyle * checkstyle Co-authored-by: Siedlerchr <siedlerkiller@gmail.com>
JabRef · Nov 7, 2022 · 2b38019 · 2b38019
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commit 2b38019
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diff --git a/src/main/java/org/jabref/model/entry/Date.java b/src/main/java/org/jabref/model/entry/Date.java
@@ -38,7 +38,10 @@ public class Date {
                 "d.M.uuuu",                             // covers 15.1.2015
                 "uuuu.M.d",                             // covers 2015.1.15
                 "uuuu",                                 // covers 2015
-                "MMM, uuuu");                           // covers Jan, 2020
+                "MMM, uuuu",                            // covers Jan, 2020
+                "uuuu/M",                               // covers 2020/10
+                "uuuu.MM.d"                             // covers 2015.10.15
+                );
 
         SIMPLE_DATE_FORMATS = formatStrings.stream()
                                            .map(DateTimeFormatter::ofPattern)

diff --git a/src/test/java/org/jabref/model/entry/DateTest.java b/src/test/java/org/jabref/model/entry/DateTest.java
@@ -42,7 +42,10 @@ private static Stream<Arguments> validDates() {
                 Arguments.of(LocalDate.of(2015, Month.JANUARY, 15), "15.1.2015"),
                 Arguments.of(LocalDate.of(2015, Month.JANUARY, 15), "2015.1.15"),
                 Arguments.of(Year.of(2015), "2015"),
-                Arguments.of(YearMonth.of(2020, Month.JANUARY), "Jan, 2020"));
+                Arguments.of(YearMonth.of(2020, Month.JANUARY), "Jan, 2020"),
+                Arguments.of(LocalDate.of(2015, Month.OCTOBER, 15), "2015.10.15"),
+                Arguments.of(LocalDate.of(-10000, Month.OCTOBER, 15), "-10000-10-15")
+                );
     }
 
     @ParameterizedTest