Fix compile issue with commit timestamp

build.gradle

@@ -180,9 +180,9 @@ tasks.register('injectGitHash') {
     
     def gitCommitTime = {
         try {
-            return 'git log -1 --format=%at --date=unix'.execute().text.trim()
+            return 'git log -1 --format=%at --date=raw'.execute().text.trim()
         } catch (ignored) {
-            return ''
+            return '0'
         }
     }
 

src/main/java/emu/lunarcore/LunarCore.java

@@ -229,7 +229,9 @@ public class LunarCore {
             builder.append(hash);
             
             long timestamp = buildConfig.getField("COMMIT_TIMESTAMP").getLong(null);
-            builder.append(" (" + sf.format(new Date(timestamp * 1000)) + ")");
+            if (timestamp > 0) {
+                builder.append(" (" + sf.format(new Date(timestamp * 1000)) + ")");
+            }
         } catch (Exception e) {
             // Ignored
         }