make spec runnable in other TZs than Asia/Tokyo
make spec runnable in other TZs than Asia/Tokyo

AndBicScadMedia/rufus-scheduler,safesoftware/rufus-scheduler,kssminus/rufus-scheduler,jmettraux/rufus-scheduler,moritoru81/rufus-scheduler,railsfactory-kumaresan/rufus-scheduler,shutl/rufus-scheduler