fix(install): date deserialization. Closes #1512.

HMCLCore/src/test/java/org/jackhuang/hmcl/util/gson/DateTypeAdapterTest.java

@@ -0,0 +1,28 @@
+package org.jackhuang.hmcl.util.gson;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.time.LocalDateTime;
+import java.time.ZoneOffset;
+
+public class DateTypeAdapterTest {
+
+    @Test
+    public void parse() {
+        Assert.assertEquals(
+                LocalDateTime.of(2017, 6, 8, 4, 26, 33)
+                        .atOffset(ZoneOffset.UTC).toInstant(),
+                DateTypeAdapter.deserializeToDate("2017-06-08T04:26:33+0000").toInstant());
+
+        Assert.assertEquals(
+                LocalDateTime.of(2021, 1, 3, 0, 53, 34)
+                        .atOffset(ZoneOffset.UTC).toInstant(),
+                DateTypeAdapter.deserializeToDate("2021-01-03T00:53:34+00:00").toInstant());
+
+        Assert.assertEquals(
+                LocalDateTime.of(2021, 1, 3, 0, 53, 34)
+                        .atOffset(ZoneOffset.UTC).toInstant(),
+                DateTypeAdapter.deserializeToDate("2021-01-03T00:53:34").toInstant());
+    }
+}