SimpleMachines / SMF2.1

		$end_string = $end_date_string . (isset($end_time_string) ? ' ' . $end_time_string : '');

	// If some form of string input was given, override individually defined options with it

	if (isset($start_string))

	{

		$start_string_parsed = date_parse($start_string);

		if (empty($start_string_parsed['error_count']) && empty($start_string_parsed['warning_count']))

		{

			if ($start_string_parsed['year'] != false)

			{

				$start_year = $start_string_parsed['year'];

				$start_month = $start_string_parsed['month'];

				$start_day = $start_string_parsed['day'];

			}

			if ($start_string_parsed['hour'] != false)

			{

				$start_hour = $start_string_parsed['hour'];

				$start_minute = $start_string_parsed['minute'];

				$start_second = $start_string_parsed['second'];

			}

		}

	}

	if (isset($end_string))

	{

		$end_string_parsed = date_parse($end_string);

			}

		}

	}

	if (isset($end_string))

	{

		$end_string_parsed = date_parse($end_string);

		if (empty($end_string_parsed['error_count']) && empty($end_string_parsed['warning_count']))

		{

			if ($end_string_parsed['year'] != false)

			{

				$end_year = $end_string_parsed['year'];

				$end_month = $end_string_parsed['month'];

				$end_day = $end_string_parsed['day'];

			}

			if ($end_string_parsed['hour'] != false)

			{

				$end_hour = $end_string_parsed['hour'];

				$end_minute = $end_string_parsed['minute'];

				$end_second = $end_string_parsed['second'];

			}

		}

	}

	// Validate input

	$start_date_isvalid = checkdate($start_month, $start_day, $start_year);