Operations with Time objects

ruby-talk
1

Hi guys.
I want to know the time remain before an expiration.
If I do t_remained = Time.now - expiration I get a float object.
how can I convert it back to Time(days hours and minute)?

thanks

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2

I have tried this:

t = Time.now

=> Thu Mar 13 12:57:47 +0100 2008

t1 = Time.now + 1.hours

=> Thu Mar 13 13:58:03 +0100 2008

t2 = t1 - t

=> 3615.968256

tot = Time.at(t2)

=> Thu Jan 01 02:00:15 +0100 1970

but I don't know why the difference between t1 e t is 2 hours and not 1
hour?

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3

Stefano Bortolotti wrote:

I have tried this:

t = Time.now

=> Thu Mar 13 12:57:47 +0100 2008

t1 = Time.now + 1.hours

=> Thu Mar 13 13:58:03 +0100 2008

t2 = t1 - t

=> 3615.968256

tot = Time.at(t2)

=> Thu Jan 01 02:00:15 +0100 1970

but I don't know why the difference between t1 e t is 2 hours and not 1 hour?

a Time object doesn't represent a duration (2 hours) it represents a point in time (Jan 1st 1970, 2am). There's no standard Ruby object representing a time duration, but it seems that a Float (number of seconds) is good enough.

you can always do (num_of_seconds / 1.hour) to give you a fractional number of hours etc.

Gareth

4

I have tried this:

t = Time.now

=> Thu Mar 13 12:57:47 +0100 2008

t1 = Time.now + 1.hours

=> Thu Mar 13 13:58:03 +0100 2008

t2 = t1 - t

=> 3615.968256

tot = Time.at(t2)

=> Thu Jan 01 02:00:15 +0100 1970

but I don't know why the difference between t1 e t is 2 hours and not 1
hour?

t = Time.now

=> Thu Mar 13 09:26:37 -0400 2008

t1 = Time.now + 3600

=> Thu Mar 13 10:26:56 -0400 2008

t2 = t1 - t

=> 3618.385132

Time.at(t2)

=> Wed Dec 31 20:00:18 -0500 1969

Because you're not looking at the time zone (+0100).

-Rob

Rob Biedenharn http://agileconsultingllc.com
Rob@AgileConsultingLLC.com

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On Mar 13, 2008, at 8:02 AM, Stefano Bortolotti wrote:

5

Thanks guys! I have done this:

  def remaining_time
    if expiration != nil
      diff = expiration - Time.now

      days = (diff / 1.day).to_i
      hours = ((diff / 1.hour) % 24).to_i
      mins = ((diff / 1.minute) 60).to_i

      if diff < 7.days
        return days.to_s + "gg, " + hours.to_s + ":" + mins.to_s
      else
        return "more than 7 days"
      end
    end
  end

I'll try to improve it! If you have some advices, they are wellcomes..

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6

Since you have 1.day, 1.hour, 1.min, I assume that you have ActiveSupport and likely have Rails. In any case, you can use distance_of_time_in_words

If you want to clean up your own method:

days, dayfrac = diff.divmod(1.day)
hours, hrfrac = dayfrac.divmod(1.hour)
mins, secs = hrfrac.divmod(1.min)

if days >= 7
   return "more than 7 days"
else
   result =
   result << "%sgg,"%days unless days.zero?
   result << "%d:%0d"%[hours,mins]
   return result.join(' ')
end

-Rob

Rob Biedenharn http://agileconsultingllc.com
Rob@AgileConsultingLLC.com

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On Mar 13, 2008, at 12:11 PM, Stefano Bortolotti wrote:

Thanks guys! I have done this:

def remaining_time
   if expiration != nil
     diff = expiration - Time.now

     days = (diff / 1.day).to_i
     hours = ((diff / 1.hour) % 24).to_i
     mins = ((diff / 1.minute) 60).to_i

     if diff < 7.days
       return days.to_s + "gg, " + hours.to_s + ":" + mins.to_s
     else
       return "more than 7 days"
     end
   end
end

I'll try to improve it! If you have some advices, they are wellcomes..

7

Rob Biedenharn wrote:

if days >= 7
   return "more than 7 days"
else
   result =
   result << "%sgg,"%days unless days.zero?
   result << "%d:%0d"%[hours,mins]
   return result.join(' ')
end

Also, there is the duration gem :
http://wiki.rubyonrails.org/rails/pages/Duration .

Regards,

Siep

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8

Rob Biedenharn wrote:

If you want to clean up your own method:

days, dayfrac = diff.divmod(1.day)
hours, hrfrac = dayfrac.divmod(1.hour)
mins, secs = hrfrac.divmod(1.min)

if days >= 7
   return "more than 7 days"
else
   result =
   result << "%sgg,"%days unless days.zero?
   result << "%d:%0d"%[hours,mins]
   return result.join(' ')
end

-Rob

Rob Biedenharn http://agileconsultingllc.com
Rob@AgileConsultingLLC.com

Thanks Rob, I knew about distance_of_time_in_words but I want my own
method.
Cool the divmod..

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