On my H112-370 there is a load of hidden UI controls for time, including functions to control the DST. My guess is that while the UI has them, they've not been suitably wired up to actually allow them to control/change anything.
It also seems that given these controls exist, there isn't an 'automatic' DST rollover, rather it would have to be user specified.
My B535 just has Time.nist.gov and ntp1.inrim.it , set to GMT and updated my time just fine. No box for DST available in the GUI. Maybe you need to specify time servers or it don't do it?