From: Osuka Adartse <rocioestradacastaneda@...>
Date: 2003-12-27T15:45:46+09:00
Subject: Re: newbie question on how to subtract two dates.

Ruby Ruby wrote:
> I have a file with a file name of the form filename.yymmdd, where yy=two digits year, mm=two digits month and dd=two digits day. For example, perf.030906 indicates 03=year 2003, 09=September and 06=the sixth day of the month (September 06, 2003).
> 
> This file contains performance data collected during the day and each system contains one file per day. We have few dozen systems collecting this data.
> 
> Every days, around 1:00 AM I have to take the file for the previous day and copy it to a central server where the new file will have the name: hostname.perf.yymmdd. The question I have is how do I subtract two dates. For example, if:
> 
> today=010104
> 
> yesterday=123103
> 
> Is there a ruby method that will allow me to perform something like: today - x and get yesterday?
> 
> Thank you
> 
> 
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You could use something like this:

require 'date'
puts today=Date.today			#=>2003-12-27
puts tomorrow=Date.new(2003,12,28)	#=>2003-12-28
puts today-1				#=>2003-12-26
puts today+30				#=>2004-01-26

cheers
Adartse