Epoch Time on CDR Report

Hi,

Currently we have FreePBX set up to display Epoch time on the CDR Reports using this format, dddd, MMMM Do YYYY, h:mm:ss a, X. According to the documentation found at Moment.js | Docs we should be able to change the upper case X to a lower case x and it display Epoch time with milliseconds. However when I make the change, it only displays the year instead. Is there a way to display the Epoch time with Milliseconds or is the documentation incorrect?

Thanks!