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PhutilCalendarDateTimeTestCase.php
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			<?php

			final class PhutilCalendarDateTimeTestCase extends PhutilTestCase {

			public function testDateTimeDuration() {
			$start = PhutilCalendarAbsoluteDateTime::newFromISO8601('20161128T090000Z')
			->setTimezone('America/Los_Angeles')
			->setViewerTimezone('America/Chicago')
			->setIsAllDay(true);

			$this->assertEqual(
			'20161128',
			$start->getISO8601());

			$end = $start
			->newAbsoluteDateTime()
			->setHour(0)
			->setMinute(0)
			->setSecond(0)
			->newRelativeDateTime('P1D')
			->newAbsoluteDateTime();

			$this->assertEqual(
			'20161129',
			$end->getISO8601());

			// This is a date which explicitly has no specified timezone.
			$start = PhutilCalendarAbsoluteDateTime::newFromISO8601('20161128', null)
			->setViewerTimezone('UTC');

			$this->assertEqual(
			'20161128',
			$start->getISO8601());

			$end = $start
			->newAbsoluteDateTime()
			->setHour(0)
			->setMinute(0)
			->setSecond(0)
			->newRelativeDateTime('P1D')
			->newAbsoluteDateTime();

			$this->assertEqual(
			'20161129',
			$end->getISO8601());
			}


			}