A module to calculate human seconds with accuracy.

calculate.rb

module WMUtility
  class Calculate
    # modified from http://stackoverflow.com/questions/4136248/how-to-generate-a-human-readable-time-range-using-ruby-on-rails#answer-4136485
    def self.human_seconds(secs, options={})
      options = {
        seconds: false,
        minutes: true,
        hours:  true,
        days: true,
      }.merge(options)
      # Collect sections
      values = [[60, "second"], [60, "minute"], [24, "hour"], [1000, "day"]].map do |count, name|
        if secs.present? && secs > 0
          secs, n = secs.divmod(count)
          "#{ActionController::Base.helpers.pluralize(n.to_i, name)}" if options["#{name}s".to_sym] && n.to_i > 0
        end
      end
      # Return human string or nil
      values.compact.reverse.join(' ')
    end
  end
end