core-bundle/src/Resources/contao/library/Contao/System.php
public static function parseDate($strFormat, $intTstamp=null)
	{
		@trigger_error('Using System::parseDate() has been deprecated and will no longer work in Contao 5.0. Use Date::parse() instead.', E_USER_DEPRECATED);

		return Date::parse($strFormat, $intTstamp);
	}
public static function parseDate($strFormat, $intTstamp=null)
	{
		@trigger_error('Using System::parseDate() has been deprecated and will no longer work in Contao 5.0. Use Date::parse() instead.', E_USER_DEPRECATED);

		return Date::parse($strFormat, $intTstamp);
	}
Parse a date format string and translate textual representations

@param string  $strFormat The date format string
@param integer $intTstamp An optional timestamp

@return string The textual representation of the date

@deprecated Deprecated since Contao 4.0, to be removed in Contao 5.0.
Use Date::parse() instead.