cron job at specific hours

[jxzhangxing]

How can I do something like this:
Crono.perform(WeatherForecast).every 1.day, at: ['1:00', '2:00', '3:00']

[iwan]

['1:00', '2:00', '3:00'].each do |time|
   Crono.perform(WeatherForecast).every 1.day, at: time
end