I was searching for a windows implementation for the php function strptime, however the best help/advice that I could find was read the source code and write it yourself. Here is my implentation that I knocked up with date_parse_from_format so you can use it on version of php less than 5.3.0

if (!function_exists('date_parse_from_format')) {
	function date_parse_from_format($format, $date) {
		$returnArray = array('hour' => 0, 'minute' => 0, 'second' => 0,
							'month' => 0, 'day' => 0, 'year' => 0);

		$dateArray = array();

		// array of valid date codes with keys for the return array as the values
		$validDateTimeCode = array('Y' => 'year', 'y' => 'year',
									'm' => 'month', 'n' => 'month',
									'd' => 'day', 'j' => 'day',
									'H' => 'hour', 'G' => 'hour',
									'i' => 'minute', 's' => 'second');

		/* create an array of valid keys for the return array
		 * in the order that they appear in $format
		 */
		for ($i = 0 ; $i <= strlen($format) - 1 ; $i++) {
			$char = substr($format, $i, 1);

			if (array_key_exists($char, $validDateTimeCode)) {
				$dateArray[$validDateTimeCode[$char]] = '';
			}
		}

		// create array of reg ex things for each date part
		$regExArray = array('.' => '\.', // escape the period

							// parse d first so we dont mangle the reg ex
							// day
							'd' => '(\d{2})',

							// year
							'Y' => '(\d{4})',
							'y' => '(\d{2})',

							// month
							'm' => '(\d{2})',
							'n' => '(\d{1,2})',

							// day
							'j' => '(\d{1,2})',

							// hour
							'H' => '(\d{2})',
							'G' => '(\d{1,2})',

							// minutes
							'i' => '(\d{2})',

							// seconds
							's' => '(\d{2})');

		// create a full reg ex string to parse the date with
		$regEx = str_replace(array_keys($regExArray),
								array_values($regExArray),
								$format);

		// Parse the date
		preg_match("#$regEx#", $date, $matches);

		// some checks...
		if (!is_array($matches) ||
			$matches[0] != $date ||
			sizeof($dateArray) != (sizeof($matches) - 1)) {
			return $returnArray;
		}

		// an iterator for the $matches array
		$i = 1;

		foreach ($dateArray AS $key => $value) {
			$dateArray[$key] = $matches[$i++];

			if (array_key_exists($key, $returnArray)) {
				$returnArray[$key] = $dateArray[$key];
			}
		}

		return $returnArray;
	}
}

if (!function_exists('strptime')) {
	function strptime($format, $date) {
		$dateArray = array();

		$dateArray = date_parse_from_format($format, $date);

		if (is_array($dateArray)) {
			return mktime($dateArray['hour'],
							$dateArray['minute'],
							$dateArray['second'],
							$dateArray['month'],
							$dateArray['day'],
							$dateArray['year']);
		} else {
			return 0;
		}
	}
}

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