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formatting, dst error

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This commit is contained in:
Loredana Crusoveanu 2018-03-24 10:17:26 +02:00
parent 86e8493bbf
commit 068a21f32a
2 changed files with 73 additions and 75 deletions
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73
core-java/src/test/java/com/baeldung/dst/DaylightSavingTimeExamplesTest.java
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@ -14,47 +14,46 @@ import org.junit.Test;
public class DaylightSavingTimeExamplesTest { public class DaylightSavingTimeExamplesTest {
@Test @Test
public void givenItalianTimeZone_WhenDSTHappens_ThenCorrectlyShiftTimeZone() throws ParseException { public void givenItalianTimeZone_WhenDSTHappens_ThenCorrectlyShiftTimeZone() throws ParseException {
TimeZone tz = TimeZone.getTimeZone("Europe/Rome"); TimeZone tz = TimeZone.getTimeZone("Europe/Rome");
Calendar cal = Calendar.getInstance(tz, Locale.ITALIAN); Calendar cal = Calendar.getInstance(tz, Locale.ITALIAN);
DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm", Locale.ITALIAN); DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm", Locale.ITALIAN);
Date dateBeforeDST = df.parse("2018-03-25 01:55"); df.setTimeZone(tz);
prettyPrint(cal.getTimeZone()); Date dateBeforeDST = df.parse("2018-03-25 01:55");
prettyPrint(cal.getTimeZone());
cal.setTime(dateBeforeDST); cal.setTime(dateBeforeDST);
System.out.println("Before DST (00:55 UTC - 01:55 GMT+1) = " + dateBeforeDST); System.out.println("Before DST (00:55 UTC - 01:55 GMT+1) = " + dateBeforeDST);
System.out.println("With this Calendar " + (cal.get(Calendar.ZONE_OFFSET) + cal.get(Calendar.DST_OFFSET)) / (60 * 1000) + " minutes must be added to UTC (GMT TimeZone) to get a correct date for this TimeZone\n");
assertThat(cal.get(Calendar.ZONE_OFFSET)).isEqualTo(3600000);
assertThat(cal.get(Calendar.DST_OFFSET)).isEqualTo(0);
cal.add(Calendar.MINUTE, 10); System.out.println("With this Calendar " + (cal.get(Calendar.ZONE_OFFSET) + cal.get(Calendar.DST_OFFSET)) / (60 * 1000) + " minutes must be added to UTC (GMT TimeZone) to get a correct date for this TimeZone\n");
assertThat(cal.get(Calendar.ZONE_OFFSET)).isEqualTo(3600000);
assertThat(cal.get(Calendar.DST_OFFSET)).isEqualTo(0);
Date dateAfterDST = cal.getTime(); cal.add(Calendar.MINUTE, 10);
System.out.println(" After DST (01:05 UTC - 03:05 GMT+2) = " + dateAfterDST);
System.out.println("With this Calendar " + (cal.get(Calendar.ZONE_OFFSET) + cal.get(Calendar.DST_OFFSET)) / (60 * 1000) + " minutes must be added to UTC (GMT TimeZone) to get a correct date for this TimeZone\n");
assertThat(cal.get(Calendar.DST_OFFSET)).isEqualTo(3600000);
assertThat(dateAfterDST).isEqualTo(df.parse("2018-03-25 03:05"));
Long deltaBetweenDatesInMillis = dateAfterDST.getTime() - dateBeforeDST.getTime(); Date dateAfterDST = cal.getTime();
Long tenMinutesInMillis = (1000L * 60 * 10);
assertThat(deltaBetweenDatesInMillis).isEqualTo(tenMinutesInMillis);
}
private void prettyPrint(TimeZone tz) { System.out.println(" After DST (01:05 UTC - 03:05 GMT+2) = " + dateAfterDST);
System.out.println(String.format( System.out.println("With this Calendar " + (cal.get(Calendar.ZONE_OFFSET) + cal.get(Calendar.DST_OFFSET)) / (60 * 1000) + " minutes must be added to UTC (GMT TimeZone) to get a correct date for this TimeZone\n");
" Zone ID = %s (%s)\n" assertThat(cal.get(Calendar.DST_OFFSET)).isEqualTo(3600000);
+ " RawOffset = %s minutes\n" assertThat(dateAfterDST).isEqualTo(df.parse("2018-03-25 03:05"));
+ " DST = %s minutes\n"
+ " -----------------------------------------",
tz.getID(), tz.getDisplayName(), tz.getRawOffset()/60000, tz.getDSTSavings()/60000));
}
@Test Long deltaBetweenDatesInMillis = dateAfterDST.getTime() - dateBeforeDST.getTime();
public void whenIterating_ThenPrintAllTimeZones() { Long tenMinutesInMillis = (1000L * 60 * 10);
for (String id : TimeZone.getAvailableIDs()) { assertThat(deltaBetweenDatesInMillis).isEqualTo(tenMinutesInMillis);
TimeZone tz = TimeZone.getTimeZone(id); }
prettyPrint(tz);
} private void prettyPrint(TimeZone tz) {
} System.out.println(
String.format(" Zone ID = %s (%s)\n" + " RawOffset = %s minutes\n" + " DST = %s minutes\n" + " -----------------------------------------", tz.getID(), tz.getDisplayName(), tz.getRawOffset() / 60000, tz.getDSTSavings() / 60000));
}
@Test
public void whenIterating_ThenPrintAllTimeZones() {
for (String id : TimeZone.getAvailableIDs()) {
TimeZone tz = TimeZone.getTimeZone(id);
prettyPrint(tz);
}
}
} }

55
core-java/src/test/java/com/baeldung/dst/DaylightSavingTimeJavaTimeExamplesTest.java
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@ -13,40 +13,39 @@ import org.junit.Test;
public class DaylightSavingTimeJavaTimeExamplesTest { public class DaylightSavingTimeJavaTimeExamplesTest {
@Test @Test
public void givenItalianTimeZone_WhenDSTHappens_ThenCorrectlyShiftTimeZone() throws ParseException { public void givenItalianTimeZone_WhenDSTHappens_ThenCorrectlyShiftTimeZone() throws ParseException {
ZoneId italianZoneId = ZoneId.of("Europe/Rome"); ZoneId italianZoneId = ZoneId.of("Europe/Rome");
LocalDateTime localDateTimeBeforeDST = LocalDateTime.of(2018, 3, 25, 1, 55); LocalDateTime localDateTimeBeforeDST = LocalDateTime.of(2018, 3, 25, 1, 55);
System.out.println(localDateTimeBeforeDST); System.out.println(localDateTimeBeforeDST);
assertThat(localDateTimeBeforeDST.toString()).isEqualTo("2018-03-25T01:55"); assertThat(localDateTimeBeforeDST.toString()).isEqualTo("2018-03-25T01:55");
ZonedDateTime zonedDateTimeBeforeDST = localDateTimeBeforeDST.atZone(italianZoneId); ZonedDateTime zonedDateTimeBeforeDST = localDateTimeBeforeDST.atZone(italianZoneId);
prettyPrint(zonedDateTimeBeforeDST); prettyPrint(zonedDateTimeBeforeDST);
assertThat(zonedDateTimeBeforeDST.toString()).isEqualTo("2018-03-25T01:55+01:00[Europe/Rome]"); assertThat(zonedDateTimeBeforeDST.toString()).isEqualTo("2018-03-25T01:55+01:00[Europe/Rome]");
ZonedDateTime zonedDateTimeAfterDST = zonedDateTimeBeforeDST.plus(10, ChronoUnit.MINUTES); ZonedDateTime zonedDateTimeAfterDST = zonedDateTimeBeforeDST.plus(10, ChronoUnit.MINUTES);
prettyPrint(zonedDateTimeAfterDST); prettyPrint(zonedDateTimeAfterDST);
assertThat(zonedDateTimeAfterDST.toString()).isEqualTo("2018-03-25T03:05+02:00[Europe/Rome]"); assertThat(zonedDateTimeAfterDST.toString()).isEqualTo("2018-03-25T03:05+02:00[Europe/Rome]");
Long deltaBetweenDatesInMinutes = ChronoUnit.MINUTES.between(zonedDateTimeBeforeDST,zonedDateTimeAfterDST); Long deltaBetweenDatesInMinutes = ChronoUnit.MINUTES.between(zonedDateTimeBeforeDST, zonedDateTimeAfterDST);
assertThat(deltaBetweenDatesInMinutes).isEqualTo(10); assertThat(deltaBetweenDatesInMinutes).isEqualTo(10);
} }
private void prettyPrint(ZonedDateTime zdt) { private void prettyPrint(ZonedDateTime zdt) {
System.out.println(String.format( System.out.println(String.format(" ZonedDateTime = %s\n" + " Zone ID = %s (%s)\n" + " RawOffset = %s minutes\n" + " -----------------------------------------", zdt, zdt.getZone(), zdt.getZone()
" ZonedDateTime = %s\n" .getId(),
+ " Zone ID = %s (%s)\n" zdt.getOffset()
+ " RawOffset = %s minutes\n" .getTotalSeconds() / 60));
+ " -----------------------------------------", }
zdt, zdt.getZone(), zdt.getZone().getId(), zdt.getOffset().getTotalSeconds()/60));
}
@Test @Test
public void whenCounting_ThenPrintDifferencesBetweenAPIs() { public void whenCounting_ThenPrintDifferencesBetweenAPIs() {
System.out.println("Total java.time.ZoneId count : " + ZoneId.getAvailableZoneIds().size()); System.out.println("Total java.time.ZoneId count : " + ZoneId.getAvailableZoneIds()
System.out.println("Total java.util.TimeZone Id count : " + TimeZone.getAvailableIDs().length); .size());
} System.out.println("Total java.util.TimeZone Id count : " + TimeZone.getAvailableIDs().length);
}
} }