[xmonad] xmobar time stops when system clock turns back

[Adam Vogt]

I guess that this place is the best to report this issue:

You just have to set your clock back a couple seconds (or more), and the 
time display doesn't update immediately. Going forward is fine.

I think that when you pass the time that is 'stuck' on xmobar, it sometimes 
starts updating again.

Not that this is much of a problem, I think that it is still a bug, the 
workaround being to restart xmobar.