Looks like a bug. The time of block #25938 is "2018-01-30 03:25:35". The client should get this time and add your timezone.
You can create a issue on github (just check to see if there is such a problem already).
But I think it's not client bug, maybe problem in java or windows.
The Semux client use standart function for display date:
DateFormat format = DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.SHORT);
return format.format(new Date(timestamp));
Probably you right, it's not semux problem. I'm using VM Box for semux, maybe it's their bug.