If that sign in date/time & idle time is for yourself, it's probably available from others, but you have to specify the nick twice in the /whois command in order to get it.
/whois <nick> will return all the information if it is your nick
/whois <nick> <nick> is required for all of the information to be returned for someone else's nick.
If this doesn't resolve your question, then please post the network and I'll see what I can find.