Could not parse the remainder: '('Y-m-d\TH:m:s')' from 'date('Y-m-d\TH:m:s')

It seems like you are trying to format a date string using the PHP function `date()`. The correct syntax for this function is `date(format, timestamp)`, where `format` is the desired date format and `timestamp` is the optional UNIX timestamp to be formatted.

For example, if you want to format the current date and time in the format "Y-m-d\TH:m:s", you can use the following code:

$dateString = date('Y-m-d\TH:i:s');

This will output a string like "2021-09-01T14:30:00". Note that you need to escape the special characters in the format string using a backslash, like in the example above where `\T` is used to represent the letter "T".