Just to give a couple more details if they're needed: $daylight returns 0 when this bug occurs, and disabling Windows' automatic DST adjustment setting seems to fix it.
It's showing
0 for me too but I would expect that at the moment.
$calc(($ctime - $gmt) / 3600) returns
11$calc(($ctime - $gmt + $daylight) / 3600) returns
11Me too, I probably jumped on you a bit hard.