Fastlane Ruby Build Number Function

buildnumber.rb

  # Generates a build number that will consistently increase worldwide.
  # Useful for coordinating build uploads between teams in different timezones.
  # Format is "YYYYMMDDsss" where "sss" is the 1000ths slice of the day.
  # For example, I just ran it in NYC at 5:55pm on 2020-04-27 and got back: 20200427913
  # If anyone else worldwide (with a correct system clock) runs it after this,
  # they will get a bigger number guaranteed.
  def generate_build_number()
    time = Time.new.getutc

    date = time.strftime("%Y%m%d")

    daySlice = 1000 * ((((time.hour * 60) + time.min) * 60) + time.sec) / (24 * 60 * 60)

    return date + daySlice.to_s
  end