I find myself unable to even utilise the ingame time because it really runs way too fast. You can at 8 AM set up a meeting for 10 AM, but even if you run, you won't make it in time. Nighttime has no meaning, either, as it, too, passes too quickly to even embrace it in your RP. An ordinary tavern chat can easily take several ingame days. IOW, measure the time by your char's / RP timeline, not by the server's clock. That way, you can also fast-forward or insert RP in your timeline. Things are bound to conflict, though, so it's best to not use explicit time / dates unless really necessary. Maybe you could use "Day 1", "Day 2", etc. in your diary?
Edit: I therefore have come to think that the ingame clock should run at half the speed of the RL clock (yes, this is significantly larger than even my original proposal). This way, everyone would be able to enjoy both daytime and nighttime, as was the reason for the fast timeline ingame. However, one would also be able to set up dates and actually utilise the ingame clock, synchronising to it instead of ignoring it. It would also reflect the longer time it takes to type than to talk, as well as the fact that most players can't spend as much time in PS as they spend on RL.