Date formatter

src/main/java/utils/DateUtilities.java

@@ -9,6 +9,8 @@
 import java.time.temporal.ChronoUnit;
 import java.util.Calendar;
 import java.util.Date;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 public class DateUtilities {
 
@@ -220,4 +222,45 @@ public static String getCurrentDate(ZoneIds zoneId) {
         DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd");
         return dtf.format(now);
     }
+
+    /**
+     * Formats a date string from a specified input format to a desired output format.
+     *
+     * @param input        The date string to format.
+     * @param inputFormat  The format of the input date string (e.g., "yyyy-MM-dd").
+     * @param outputFormat The desired format of the output date string (e.g., "MM/dd/yyyy").
+     * @return The formatted date string.
+     * @throws RuntimeException If the input date string cannot be parsed according to the specified input format.
+     *                          The exception is a `RuntimeException` wrapping the original `ParseException`.
+     */
+    public static String fixDateFormat(String input, String inputFormat, String outputFormat) {
+        try {
+            SimpleDateFormat simpleDateFormat = new SimpleDateFormat(inputFormat);
+            Date date = simpleDateFormat.parse(input);
+            SimpleDateFormat outputSimpleDateFormat = new SimpleDateFormat(outputFormat);
+            return outputSimpleDateFormat.format(date);
+        }
+        catch (ParseException exception) {throw new RuntimeException(exception);}
+    }
+
+    /**
+     * Formats a date string from an automatically detected input format to a
+     * user-specified output format.
+     *
+     * @param input        The date string to format.
+     * @param outputFormat The desired output format string (e.g., "yyyy-MM-dd").
+     * @return The formatted date string, or the original input string if the
+     *         input format cannot be detected.
+     */
+    public static String fixDateFormat(String input, String outputFormat) {
+        String[] SUPPORTED_INPUT_FORMATS = {
+                "yyyy-M-dd", "yyyy-MM-dd", "M/d/yyyy", "MM/d/yyyy", "yyyy/M/d", "yyyy/MM/d",
+                "M-d-yyyy", "MM-d-yyyy", "yyyy-M-d", "yyyy-MM-d"
+        };
+        for (String inputFormat : SUPPORTED_INPUT_FORMATS) {
+            try {return fixDateFormat(input, inputFormat, outputFormat);}
+            catch (Exception ignored) {}
+        }
+        return input;
+    }
 }

src/test/java/AppTest.java

@@ -336,5 +336,19 @@ public void jsonSchemaTest() {
                "{\"type\":\"object\",\"properties\":{\"id\":{\"type\":\"integer\"},\"category\":{\"type\":\"object\",\"properties\":{\"id\":{\"type\":\"integer\"},\"name\":{\"type\":\"string\"}}},\"name\":{\"type\":\"string\"},\"photoUrls\":{\"type\":\"array\",\"items\":{\"type\":\"string\"}},\"tags\":{\"type\":\"array\",\"items\":{\"type\":\"object\",\"properties\":{\"id\":{\"type\":\"integer\"},\"name\":{\"type\":\"string\"}}}},\"status\":{\"type\":\"string\"}}}",
                petSchema.toString()
        );
+        printer.success("The jsonSchemaTest() test pass!");
+    }
+
+    @Test
+    public void dateFormatTest() {
+       String date = "2025-6-20";
+       String expectedDate = "2025-06-20";
+
+       Assert.assertEquals(
+               "Fixed date format did not match the expected one!",
+               expectedDate,
+               DateUtilities.fixDateFormat(date, "yyyy-MM-dd")
+       );
+        printer.success("The dateFormatTest() test pass!");
     }
 }