DefaultTimeZoneOffsetTests Class — spring-boot Architecture

Source Code

build-plugin/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/tasks/bundling/DefaultTimeZoneOffsetTests.java lines 34–77

class DefaultTimeZoneOffsetTests {

	// gh-21005

	@Test
	void removeFromWithLongInDifferentTimeZonesReturnsSameValue() {
		long time = OffsetDateTime.of(2000, 1, 1, 0, 0, 0, 0, ZoneOffset.UTC).toInstant().toEpochMilli();
		TimeZone timeZone1 = TimeZone.getTimeZone("GMT");
		TimeZone timeZone2 = TimeZone.getTimeZone("GMT+8");
		TimeZone timeZone3 = TimeZone.getTimeZone("GMT-8");
		long result1 = new DefaultTimeZoneOffset(timeZone1).removeFrom(time);
		long result2 = new DefaultTimeZoneOffset(timeZone2).removeFrom(time);
		long result3 = new DefaultTimeZoneOffset(timeZone3).removeFrom(time);
		long dosTime1 = toDosTime(Calendar.getInstance(timeZone1), result1);
		long dosTime2 = toDosTime(Calendar.getInstance(timeZone2), result2);
		long dosTime3 = toDosTime(Calendar.getInstance(timeZone3), result3);
		assertThat(dosTime1).isEqualTo(dosTime2).isEqualTo(dosTime3);
	}

	@Test
	void removeFromWithFileTimeReturnsFileTime() {
		long time = OffsetDateTime.of(2000, 1, 1, 0, 0, 0, 0, ZoneOffset.UTC).toInstant().toEpochMilli();
		long result = new DefaultTimeZoneOffset(TimeZone.getTimeZone("GMT+8")).removeFrom(time);
		assertThat(result).isNotEqualTo(time).isEqualTo(946656000000L);
	}

	/**
	 * Identical functionality to package-private
	 * org.apache.commons.compress.archivers.zip.ZipUtil.toDosTime(Calendar, long, byte[],
	 * int) method used by {@link ZipArchiveOutputStream} to convert times.
	 * @param calendar the source calendar
	 * @param time the time to convert
	 * @return the DOS time
	 */
	private long toDosTime(Calendar calendar, long time) {
		calendar.setTimeInMillis(time);
		final int year = calendar.get(Calendar.YEAR);
		final int month = calendar.get(Calendar.MONTH) + 1;
		return ((year - 1980) << 25) | (month << 21) | (calendar.get(Calendar.DAY_OF_MONTH) << 16)
				| (calendar.get(Calendar.HOUR_OF_DAY) << 11) | (calendar.get(Calendar.MINUTE) << 5)
				| (calendar.get(Calendar.SECOND) >> 1);
	}

}