Rubyで現在時刻を表示する
require 'date'
puts Date.today # 2017-04-01
puts Date.today.to_time # 2017-04-01 00:00:00 +0900
puts Time.now # 2017-04-01 10:13:53 +0900
# 2017/04/01 10:13:53
time = DateTime.now
printf("%04d/%02d/%02d %02d:%02d:%02d\n",time.year, time.month, time.day, time.hour, time.min ,time.sec)