On Apr 16, 2008, at 6:24 AM, Jesù¸ Gabriel y GaláÏ wrote:
> On Wed, Apr 16, 2008 at 11:56 AM, Clement Ow
> <clement.ow / asia.bnpparibas.com> wrote:
>> I have a program where i put the time at the beginning:
>> puts $t1=Time.now
>>
>> and then after running some commands, i put the time again:
>> puts $t2=Time.now
>>
>> and then have a method to calculate the time elapsed:
>> def calTime
>> starttime_sec= $t1.strftime("%S").to_i
>> starttime_min= $t1.strftime("%M").to_i
>> endtime_sec= $t2.strftime("%S").to_i
>> endtime_min= $t2.strftime("%M").to_i
>> diff_sec= endtime_sec - starttime_sec
>> diff_sec1= diff_sec.to_s
>> diff_min= endtime_min - starttime_min
>> diff_min1= diff_min.to_s
>> puts "\nElapsed time:\n "+ "Min-> " +diff_min1 + " Sec-> "+ diff_sec1
>>
>> However, the calculation has limitations because if the start time is
>> say, 4:50 and the end time is 5:10, it will return an errorneous  
>> value
>> like -49 for the Min value, which is obviously not what we want..
>>
>> Any alternative method or any corrections to the method are  
>> welcome. ;)
>
> Alternative:
>
> irb(main):001:0> start = Time.now
> => Wed Apr 16 12:06:23 +0200 2008
> irb(main):003:0> finish = Time.now
> => Wed Apr 16 12:07:24 +0200 2008
> irb(main):005:0> elapsed = (finish - start).to_i
> => 65
> irb(main):012:0> mins = elapsed / 60
> => 1
> irb(main):013:0> secs = elapsed % 60
> => 5
>
> Jesus.


or:
irb> start = Time.now
=> Wed Apr 16 10:41:03 -0400 2008
irb> finish = Time.now
=> Wed Apr 16 10:45:53 -0400 2008
irb> elapsed = finish.to_f - start.to_f   # note to_f to keep  
fractional seconds
=> 289.695813894272
irb> mins, secs = elapsed.divmod 60.0
=> [4, 49.6958138942719]
irb> puts("%3d:%04.2f"%[mins.to_i, secs])
   4:49.70
=> nil

-Rob

Rob Biedenharn		http://agileconsultingllc.com