I'm using Smack 3.2.1 to communicate with Cisco (formerly Jabber) XCP 5.8. It works pretty well but XCP 5.8 returns delayed delivery timestamps using an older format that is similar to, but not exactly, what Smack is looking for. The result is that when a user joins a MUC room all messages have the current time as their timestamp regardless of when the message was actually sent.
XEP-0091 (http://xmpp.org/extensions/xep-0091.html#time) says the timestamp should look like this: CCYYMMDDThh:mm:ss.
XCP 5.8 returns a stamp that looks like this: CCYYMMDDThh:mm:ss.millis (e.g., 20120507T12:13:14.123456). Note the inclusion of a millisecond component to the timestamp.
Anyway, this was causing Smack to miss the originally sent stamps XCP was setting which resulted in the provider defaulting to the current time. I created a custom build for us to use that modifies DelayInformationProvider.java line 75 from this:
I realize this isn't 100% in compliance with what XEP-0091 specifies (though it does align with XEP-0082 in terms of optional millis), so it might be better to define another format rather than tacking it onto the XEP-0091 format regex.
Regardless, I think this would be helpful if this were included in a future release.