Construct date time string from current date time using AMPscript

I'm trying to construct a date time string using AMPscript in the format yyyy-mmm-ddThh:mm:ss based on the current time (where T is a letter). Is it possible to achieve this without using the Concat() function? Here's what I have at the moment:

Concat(FormatDate(now(), "", "yyyy-MM-ddT"),FormatDate(now(), "", "hh:mm:ss")