@fnordish @mrpelz made something similar for the swiss railway clocks. Including proper handling for DST switchover in both directions http://htmlpreview.github.io/?https://gist.githubusercontent.com/mrpelz/5341045ad38d0fd1043625d4d8453e86/raw/04b033327f3da2c2722f4bbf0271c7ca58756898/moba-time.html