diff --git a/src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/impl/FileFilter.java b/src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/impl/FileFilter.java
index 4a84e70..1d7d79b 100644
--- a/src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/impl/FileFilter.java
+++ b/src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/impl/FileFilter.java
@@ -18,7 +18,7 @@ import java.util.regex.Pattern;
 public class FileFilter {
     private final Set<String> excluded;
     private final Pattern includePattern;
-    private final Date filterDate;
+    private final Instant filterDate;
     private final LastExecutionHandler lastExecutionHandler;
 
     private final String EXTENSION_GROUP = "extension";
@@ -52,10 +52,6 @@ public class FileFilter {
         return includePattern.matcher(pathName.getName()).matches();
     }
 
-    private boolean isNewer(File pathName, Date date) {
-        return isNewer(pathName, date.toInstant());
-    }
-
     private boolean isNewer(File pathName, Instant date) {
         if (date == null) return true;
         try {
diff --git a/src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/model/InputConfig.java b/src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/model/InputConfig.java
index 0a9db0e..5e9c629 100644
--- a/src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/model/InputConfig.java
+++ b/src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/model/InputConfig.java
@@ -12,6 +12,7 @@ import org.apache.commons.lang3.SystemUtils;
 import picocli.CommandLine;
 
 import java.io.File;
+import java.time.Instant;
 import java.util.*;
 import java.util.regex.Pattern;
 import picocli.CommandLine.Option;
@@ -56,7 +57,7 @@ public class InputConfig implements CommandLine.IVersionProvider {
     @Option(names = {"-n", "--only-new-files"}, description = "ignores all files unchanged and previously processed")
     private boolean onlyNewFiles;
     @Option(names = {"-d", "--filter-date"}, defaultValue = Option.NULL_VALUE, description = "only consider files created newer than entered date (format: \"dd.MM.yyyy-HH:mm:ss\")")
-    private Date filterDate;
+    private Instant filterDate;
     @Option(names = {"-i", "--include-pattern"}, defaultValue = ".*", description = "include files matching pattern")
     private Pattern includePattern;
     @Option(names = {"-e", "--exclude"}, arity = "1..*",
diff --git a/src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/util/DateUtils.java b/src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/util/DateUtils.java
deleted file mode 100644
index 61eaa20..0000000
--- a/src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/util/DateUtils.java
+++ /dev/null
@@ -1,29 +0,0 @@
-package at.pcgamingfreaks.mkvaudiosubtitlechanger.util;
-
-import java.text.ParseException;
-import java.text.SimpleDateFormat;
-import java.util.Date;
-
-public class DateUtils {
-    private static final SimpleDateFormat dateFormat = new SimpleDateFormat("dd.MM.yyyy-HH:mm:ss");
-
-    public static Date convert(long millis) {
-        return new Date(millis);
-    }
-
-    /**
-     * Convert String to date.
-     * @return parsed date, defaultDate if exception occurs
-     */
-    public static Date convert(String date, Date defaultDate) {
-        try {
-            return dateFormat.parse(date);
-        } catch (ParseException e) {
-            return defaultDate;
-        }
-    }
-
-    public static String convert(Date date) {
-        return dateFormat.format(date);
-    }
-}
diff --git a/src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/impl/FileFilterTest.java b/src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/impl/FileFilterTest.java
index acafa6d..0ce5d1f 100644
--- a/src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/impl/FileFilterTest.java
+++ b/src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/impl/FileFilterTest.java
@@ -1,8 +1,6 @@
 package at.pcgamingfreaks.mkvaudiosubtitlechanger.impl;
 
-import at.pcgamingfreaks.mkvaudiosubtitlechanger.model.InputConfig;
 import at.pcgamingfreaks.mkvaudiosubtitlechanger.model.ResultStatistic;
-import at.pcgamingfreaks.mkvaudiosubtitlechanger.util.DateUtils;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.junit.jupiter.params.ParameterizedTest;
@@ -14,11 +12,13 @@ import org.mockito.Mockito;
 import org.mockito.junit.jupiter.MockitoExtension;
 
 import java.io.File;
+import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.attribute.BasicFileAttributes;
-import java.util.Date;
+import java.nio.file.attribute.FileTime;
+import java.time.Instant;
+import java.time.temporal.ChronoUnit;
 import java.util.HashSet;
-import java.util.List;
 import java.util.Set;
 import java.util.regex.Pattern;
 import java.util.stream.Stream;
@@ -71,12 +71,14 @@ class FileFilterTest {
         when(file.toPath()).thenReturn(Path.of(TEST_FILE));
 
         long currentTime = System.currentTimeMillis();
-        FileFilter fileFilter = new FileFilter(excludedDirs, Pattern.compile(pattern), new Date(currentTime + filterDateOffset), null);
+        when(attributes.creationTime()).thenReturn(FileTime.fromMillis(currentTime));
+        when(attributes.lastModifiedTime()).thenReturn(FileTime.fromMillis(currentTime));
+        FileFilter fileFilter = new FileFilter(excludedDirs, Pattern.compile(pattern), Instant.ofEpochMilli(currentTime).plus(filterDateOffset, ChronoUnit.SECONDS), null);
 
-        try (MockedStatic<DateUtils> mockedFiles = Mockito.mockStatic(DateUtils.class)) {
+        try (MockedStatic<Files> mockedFiles = Mockito.mockStatic(Files.class)) {
             mockedFiles
-                    .when(() -> DateUtils.convert(anyLong()))
-                    .thenReturn(new Date(currentTime));
+                    .when(() -> Files.readAttributes(any(), eq(BasicFileAttributes.class)))
+                    .thenReturn(attributes);
 
             assertEquals(acceptanceExpected, fileFilter.accept(file, new HashSet<>(extensions)), "File is accepted");
             assertEquals(excluded, ResultStatistic.getInstance().getExcluded() > 0, "Is counted in excluded statistic");
diff --git a/src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/util/DateUtilsTest.java b/src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/util/DateUtilsTest.java
deleted file mode 100644
index 917a8ea..0000000
--- a/src/test/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/util/DateUtilsTest.java
+++ /dev/null
@@ -1,23 +0,0 @@
-package at.pcgamingfreaks.mkvaudiosubtitlechanger.util;
-
-import org.junit.jupiter.api.Disabled;
-import org.junit.jupiter.api.Test;
-
-import java.util.Date;
-
-import static org.junit.jupiter.api.Assertions.*;
-
-@Disabled
-class DateUtilsTest {
-
-    @Test
-    void convert() {
-        Date expectedDate = new Date(0);
-        String expectedString = "01.01.1970-01:00:00";
-
-        assertEquals(expectedDate, DateUtils.convert(0));
-        assertEquals(expectedDate, DateUtils.convert(expectedString, expectedDate));
-        assertEquals(expectedDate, DateUtils.convert("1234;15", expectedDate));
-        assertEquals(expectedString, DateUtils.convert(expectedDate));
-    }
-}
\ No newline at end of file