[This is a "wishlist" bug report for Emacs IRC client package ERC. This
message includes a patch that fully implements my wish.]

ERC displays various server response messages with timestamps. The
timestamp formats that are hard-coded to ERC code have some unnecessary
variation. Also, it's sometimes even unclear what is the day component
and what is the month component (due to YY/MM or MM/YY differences).

I suggest making those server response timestamp formats customizable
and having the default value in international "%Y-%m-%d %T" format (as
parsed by `format-time-string' function).

This message includes a patch that fully implements this (I believe).