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PhabricatorSearchDateField.php
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			<?php

			final class PhabricatorSearchDateField
			extends PhabricatorSearchField {

			protected function newControl() {
			return id(new AphrontFormTextControl())
			->setPlaceholder(pht('"2022-12-25" or "7 days ago"...'));
			}

			protected function getValueFromRequest(AphrontRequest $request, $key) {
			return $request->getStr($key);
			}

			public function getValueForQuery($value) {
			return $this->parseDateTime($value);
			}

			protected function validateControlValue($value) {
			if (!phutil_nonempty_scalar($value)) {
			return;
			}

			$epoch = $this->parseDateTime($value);
			if ($epoch) {
			return;
			}

			$this->addError(
			pht('Invalid'),
			pht('Date value for "%s" can not be parsed.', $this->getLabel()));
			}

			protected function parseDateTime($value) {
			if (!phutil_nonempty_scalar($value)) {
			return null;
			}

			// If this appears to be an epoch timestamp, just return it unmodified.
			// This assumes values like "2016" or "20160101" are "Ymd".
			if (is_int($value) \|\| ctype_digit($value)) {
			if ((int)$value > 30000000) {
			return (int)$value;
			}
			}

			return PhabricatorTime::parseLocalTime($value, $this->getViewer());
			}

			protected function newConduitParameterType() {
			return new ConduitEpochParameterType();
			}

			}