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Parse dates with multiple formats (#13348)

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Code examples for "Parsing Date Strings with Varying Formats"
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tgvLt 2023-04-14 08:22:30 +03:00 committed by GitHub
parent b86f875dbe
commit 5c2126b626
5 changed files with 117 additions and 0 deletions
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20
core-java-modules/core-java-8-datetime-2/src/main/java/com/baeldung/parsingDates/SimpleDateTimeFormat.java Normal file
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package com.baeldung.parsingDates;
import java.util.Arrays;
import java.util.List;
import org.joda.time.LocalDate;
import org.joda.time.format.DateTimeFormat;
public class SimpleDateTimeFormat {
public static LocalDate parseDate(String date) {
List<String> patternList = Arrays.asList("MM/dd/yyyy", "dd.MM.yyyy", "yyyy-MM-dd");
for (String pattern : patternList) {
try {
return DateTimeFormat.forPattern(pattern).parseLocalDate(date);
} catch (IllegalArgumentException e) {
}
}
return null;
}
}

17
core-java-modules/core-java-8-datetime-2/src/main/java/com/baeldung/parsingDates/SimpleDateTimeFormater.java Normal file
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package com.baeldung.parsingDates;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
public class SimpleDateTimeFormater {
public static LocalDate parseDate(String date) {
DateTimeFormatterBuilder dateTimeFormatterBuilder = new DateTimeFormatterBuilder()
.append(DateTimeFormatter.ofPattern("[MM/dd/yyyy]" + "[dd-MM-yyyy]" + "[yyyy-MM-dd]"));
DateTimeFormatter dateTimeFormatter = dateTimeFormatterBuilder.toFormatter();
return LocalDate.parse(date, dateTimeFormatter);
}
}

18
core-java-modules/core-java-8-datetime-2/src/main/java/com/baeldung/parsingDates/SimpleDateUtils.java Normal file
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package com.baeldung.parsingDates;
import java.text.ParseException;
import java.util.Date;
import org.apache.commons.lang3.time.DateUtils;
public class SimpleDateUtils {
public static Date parseDate(String date) {
try {
return DateUtils.parseDateStrictly(date,
new String[]{"yyyy/MM/dd", "dd/MM/yyyy", "yyyy-MM-dd"});
} catch (ParseException ex) {
return null;
}
}
}

19
core-java-modules/core-java-8-datetime-2/src/main/java/com/baeldung/parsingDates/SimpleParseDate.java Normal file
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package com.baeldung.parsingDates;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
public class SimpleParseDate {
public Date parseDate(String dateString, List<String> formatStrings) {
for (String formatString : formatStrings) {
try {
return new SimpleDateFormat(formatString).parse(dateString);
} catch (ParseException e) {
}
}
return null;
}
}

43
core-java-modules/core-java-8-datetime-2/src/test/java/com/baeldung/parsingDates/SimpleParseDateUnitTest.java Normal file
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package com.baeldung.parsingDates;
import com.baeldung.parsingDates.SimpleDateTimeFormat;
import com.baeldung.parsingDates.SimpleDateTimeFormater;
import com.baeldung.parsingDates.SimpleDateUtils;
import com.baeldung.parsingDates.SimpleParseDate;
import java.time.format.DateTimeParseException;
import java.util.Arrays;
import org.junit.*;
import static org.junit.Assert.*;
import org.joda.time.LocalDate;
public class SimpleParseDateUnitTest {
@Test
public void whenInvalidInput_thenGettingUnexpectedResult() {
SimpleParseDate simpleParseDate = new SimpleParseDate();
String date = "2022-40-40";
assertEquals("Sat May 10 00:00:00 UTC 2025", simpleParseDate.parseDate(date, Arrays.asList("MM/dd/yyyy", "dd.MM.yyyy", "yyyy-MM-dd")).toString());
}
@Test
public void whenInvalidDate_thenAssertThrows() {
SimpleDateTimeFormater simpleDateTimeFormater = new SimpleDateTimeFormater();
assertEquals(java.time.LocalDate.parse("2022-12-04"), simpleDateTimeFormater.parseDate("2022-12-04"));
assertThrows(DateTimeParseException.class, () -> simpleDateTimeFormater.parseDate("2022-13-04"));
}
@Test
public void whenDateIsCorrect_thenParseCorrect() {
SimpleDateUtils simpleDateUtils = new SimpleDateUtils();
assertNull(simpleDateUtils.parseDate("53/10/2014"));
assertEquals("Wed Sep 10 00:00:00 UTC 2014", simpleDateUtils.parseDate("10/09/2014").toString());
}
@Test
public void whenDateIsCorrect_thenResultCorrect() {
SimpleDateTimeFormat simpleDateTimeFormat = new SimpleDateTimeFormat();
assertNull(simpleDateTimeFormat.parseDate("53/10/2014"));
assertEquals(LocalDate.parse("2014-10-10"), simpleDateTimeFormat.parseDate("2014-10-10"));
}
}