pdfbox-trunk/xmpbox/src/test/java/org/apache/xmpbox/DateConverterTest.java
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package org.apache.xmpbox;

import static org.junit.jupiter.api.Assertions.assertEquals;

import java.text.SimpleDateFormat;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Calendar;

import org.junit.jupiter.api.Test;

/**
 * Test the date conversion utility.
 *
 */
class DateConverterTest
{

    /**
     * Test parsing several ISO8601 date formats.
     * 
     * Test with additional time zone
     * information normally not supported by ISO8601
     *
     * @throws Exception when there is an exception
     */
    @Test
    void testDateConversion() throws Exception
    {
        // Test partial dates
        Calendar convDate = DateConverter.toCalendar("2015-02-02");
        assertEquals(2015, convDate.get(Calendar.YEAR));

        //Test missing seconds
        assertEquals(DateConverter.toCalendar("2015-12-08T12:07:00-05:00"),
                     DateConverter.toCalendar("2015-12-08T12:07-05:00"));
        assertEquals(DateConverter.toCalendar("2011-11-20T10:09:00Z"),
                     DateConverter.toCalendar("2011-11-20T10:09Z"));
        
        // Test some time zone offsets
        String testString1 = "";
        String testString2 = "";

        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm[:ss][.SSS][XXX]");

        //Test missing seconds
        testString1 = "2015-12-08T12:07:00-05:00";
        testString2 = "2015-12-08T12:07-05:00";

        assertEquals(DateConverter.toCalendar(testString1), DateConverter.toCalendar(testString2));
        assertEquals(DateConverter.toCalendar(testString1).toInstant(),ZonedDateTime.parse(testString1, dateTimeFormatter).toInstant());
        assertEquals(DateConverter.toCalendar(testString2).toInstant(),ZonedDateTime.parse(testString2, dateTimeFormatter).toInstant());

        // Test some time zone offsets
        testString1 = "2015-02-02T16:37:19.192Z";
        testString2 = "2015-02-02T16:37:19.192Z";

        assertEquals(DateConverter.toCalendar(testString2).toInstant(),ZonedDateTime.parse(testString1, dateTimeFormatter).toInstant());

        testString1 = "2015-02-02T16:37:19.192+00:00";
        testString2 = "2015-02-02T16:37:19.192Z";

        assertEquals(DateConverter.toCalendar(testString2).toInstant(),ZonedDateTime.parse(testString1, dateTimeFormatter).toInstant());

        testString1 = "2015-02-02T16:37:19.192+02:00";
        testString2 = "2015-02-02T16:37:19.192+02:00";

        assertEquals(DateConverter.toCalendar(testString2).toInstant(),ZonedDateTime.parse(testString1, dateTimeFormatter).toInstant());

        testString1 = "2015-02-02T16:37:19.192Z";
        testString2 = "2015-02-02T08:37:19.192PST";

        assertEquals(DateConverter.toCalendar(testString2).toInstant(),ZonedDateTime.parse(testString1, dateTimeFormatter).toInstant());

        testString1 = "2015-02-02T16:37:19.192+01:00";
        testString2 = "2015-02-02T16:37:19.192Europe/Berlin";

        assertEquals(DateConverter.toCalendar(testString2).toInstant(),ZonedDateTime.parse(testString1, dateTimeFormatter).toInstant());

        // PDFBOX-4902: half-hour TZ
        testString1 = "2015-02-02T16:37:19.192+05:30";
        assertEquals(DateConverter.toCalendar(testString1).toInstant(),ZonedDateTime.parse(testString1, dateTimeFormatter).toInstant());

        testString1 = "2015-02-02T16:37:19.192-05:30";
        assertEquals(DateConverter.toCalendar(testString1).toInstant(),ZonedDateTime.parse(testString1, dateTimeFormatter).toInstant());

        testString1 = "2015-02-02T16:37:19.192+10:30";
        assertEquals(DateConverter.toCalendar(testString1).toInstant(),ZonedDateTime.parse(testString1, dateTimeFormatter).toInstant());
    }
    
    /**
     * Test formatting ISO8601 date formats.
     * 
     * Test with additional time zone
     * information normally not supported by ISO8601
     *
     * @throws Exception when there is an exception
     */
    @Test
    void testDateFormatting() throws Exception
    {
        final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
        Calendar cal = DateConverter.toCalendar("2015-02-02T16:37:19.192Z");
        assertEquals(dateFormat.format(cal.getTime()), 
                    dateFormat.format(DateConverter.toCalendar(DateConverter.toISO8601(cal,true)).getTime())
                );
    }
}
