# convert seconds to hours:minutes:seconds

Discussion in 'Ruby' started by `p, Dec 14, 2005.

1. ### `pGuest

hello!
i am trying to convert a number of seconds to a nicely formatted string
like this:

7683 seconds = 02:08:03

is there an easy way to accomplish this?

`p, Dec 14, 2005

2. ### Chris PineGuest

On 12/14/05, `p <> wrote:
> hello!
> i am trying to convert a number of seconds to a nicely formatted string
> like this:
>
> 7683 seconds =3D 02:08:03

Well, assuming you know how to arithmetic, conversions, and string
concatenation (and if not, check out http://pine.fm/LearnToProgram/),
all you're missing is how to pad with zeroes.

I do talk about the rjust method, but not that you can use it to pad
with things other than spaces:

2.to_s.rjust(5,'0')

This pads the string '2' (from 2.to_s) with the string '0'.

Another, fancier (or just more complicated? way:

irb(main):001:0> '%.5d' % 2
=3D> "00002"

Hope that helps,

Chris

Chris Pine, Dec 14, 2005

3. ### Andy DelcambreGuest

As long as you dont go past 24 hours you can use the Time class:

irb(main):016:0> Time.at(7683).gmtime.strftime('%R:%S')
=3D> "02:08:03"

If you dont use gmtime, it will go based off your localtime, where the
epoch =3D the offset from GMT.

also by doing the arithmatic:
irb(main):023:0> time =3D 7683
=3D> 7683
irb(main):024:0> hours =3D time/3600.to_i
=3D> 2
irb(main):025:0> minutes =3D (time/60 - hours * 60).to_i
=3D> 8
irb(main):026:0> seconds =3D (time - (minutes * 60 + hours * 3600))
=3D> 3
irb(main):030:0> printf("%02d:%02d:%02d\n", hours, minutes, seconds)
02:08:03
=3D> nil

HTH
- Andy Delcambre

On 12/14/05, `p <> wrote:
> hello!
> i am trying to convert a number of seconds to a nicely formatted string
> like this:
>
> 7683 seconds =3D 02:08:03
>
> is there an easy way to accomplish this?
>
>

Andy Delcambre, Dec 14, 2005
4. ### `pGuest

Andy Delcambre wrote:
> As long as you dont go past 24 hours you can use the Time class:
>
> irb(main):016:0> Time.at(7683).gmtime.strftime('%R:%S')
> => "02:08:03"

hey thanks! that's what i was looking for.

`p, Dec 14, 2005
5. ### Steve LittGuest

On Wednesday 14 December 2005 05:21 am, Andy Delcambre wrote:
> As long as you dont go past 24 hours you can use the Time class:
>
> irb(main):016:0> Time.at(7683).gmtime.strftime('%R:%S')
> => "02:08:03"

Next question: How do I get the number of seconds since Epoch?

SteveT

Steve Litt
http://www.troubleshooters.com

Steve Litt, Dec 14, 2005
6. ### `pGuest

Steve Litt wrote:
> On Wednesday 14 December 2005 05:21 am, Andy Delcambre wrote:
>
>>As long as you dont go past 24 hours you can use the Time class:
>>
>>irb(main):016:0> Time.at(7683).gmtime.strftime('%R:%S')
>>=> "02:08:03"

>
>
> Next question: How do I get the number of seconds since Epoch?

time.to_i
http://www.ruby-doc.org/core/classes/Time.html#M000196

`p, Dec 14, 2005
7. ### James Edward Gray IIGuest

On Dec 14, 2005, at 8:09 AM, Steve Litt wrote:

> #!/usr/bin/ruby
> b4 = Time.new
> sleep(3)
> after = Time.new
> interval = after.to_i - b4.to_i

You can just subtract normally. Time knows what to do:

interval = after - b4

> print "Started at ", b4.asctime, ", ended at ", after.asctime
> print "\n Interval is ", interval.to_s, ".\n"

It's a good idea to get into the habit of using interpolation with
Ruby. That let's Ruby take care of stringifying your values. We can
also lose those \n characters:

puts "Started at #{b4} and ended at #{after}."
puts "Interval is #{interval}."

James Edward Gray II

James Edward Gray II, Dec 14, 2005
8. ### Steve LittGuest

On Wednesday 14 December 2005 09:21 am, James Edward Gray II wrote:
> On Dec 14, 2005, at 8:09 AM, Steve Litt wrote:
> > #!/usr/bin/ruby
> > b4 = Time.new
> > sleep(3)
> > after = Time.new
> > interval = after.to_i - b4.to_i

>
> You can just subtract normally. Time knows what to do:
>
> interval = after - b4
>
> > print "Started at ", b4.asctime, ", ended at ", after.asctime
> > print "\n Interval is ", interval.to_s, ".\n"

>
> It's a good idea to get into the habit of using interpolation
> with Ruby. That let's Ruby take care of stringifying your
> values. We can also lose those \n characters:
>
> puts "Started at #{b4} and ended at #{after}."
> puts "Interval is #{interval}."

Confirmed! That's much cleaner. I've been looking for something like
that, and didn't want to kill a kitten by using printf()

Thanks

SteveT

Steve Litt
http://www.troubleshooters.com

Steve Litt, Dec 14, 2005