azure-storage-common/src/Common/Internal/Utilities.php
public static function convertToDateTime($value)
    {
        if ($value instanceof \DateTime) {
            return $value;
        }

        if (substr($value, -1) == 'Z') {
            $value = substr($value, 0, strlen($value) - 1);
        }

        return new \DateTime($value, new \DateTimeZone('UTC'));
    }
public static function convertToDateTime($value)
    {
        if ($value instanceof \DateTime) {
            return $value;
        }

        if (substr($value, -1) == 'Z') {
            $value = substr($value, 0, strlen($value) - 1);
        }

        return new \DateTime($value, new \DateTimeZone('UTC'));
    }
Converts a string to a \DateTime object. Returns false on failure.

@param string $value The string value to parse.

@return \DateTime