1 files changed, 53 insertions, 17 deletions
diff --git a/lib/ayk/age.rb b/lib/ayk/age.rb
index 0ecc40e..f51b8f1 100644
--- a/lib/ayk/age.rb
+++ b/lib/ayk/age.rb
@@ -1,37 +1,73 @@
 #! /usr/bin/env ruby
 # -*- coding: UTF-8 -*-
-
-#----------------------------------------------------------------------------
 #
-# File     : age.rb
-# Author   : Jérémy Zurcher <jeremy@asynk.ch>
-# Date     : 22/08/09 
+#   Copyright (c) 2009-2011 Jérémy Zurcher
+#
+#   Permission is hereby granted, free of charge, to any person obtaining
+#   a copy of this software and associated documentation files (the
+#   "Software"), to deal in the Software without restriction, including
+#   without limitation the rights to use, copy, modify, merge, publish,
+#   distribute, sublicense, and/or sell copies of the Software, and to
+#   permit persons to whom the Software is furnished to do so, subject to
+#   the following conditions:
+#
+#   The above copyright notice and this permission notice shall be
+#   included in all copies or substantial portions of the Software.
+#
+#   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+#   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+#   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+#   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+#   LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+#   OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+#   WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 #----------------------------------------------------------------------------
-
+#
 require 'date'
-
+#
 class DateTime
     # returns an array representing years,months,days,hours,minutes,seconds
     # between self and futur DateTime at
     def age at=DateTime.now
         return [nil]*6 if at<self
-        # years
+        return [0]*6 if at==self
         years = at.year-self.year
+        months = at.month-self.month
+        # move years forward
         x = self>>(12*years)
         if x>at
-            years -= 1
-            x<<=12
-        end
-        months = at.month-x.month+(11*(at.year-x.year))
-        x >>=months
-        if x>at
-            months -= 1
-            x <<=1
+            # move months backward
+            x>>=months
+            # adjust years and months
+            years-=1
+            months+=12
+        else
+            # move months forward
+            x>>=months
         end
-        # days
         days = (at-x).to_i
+        if days<0
+            # move 1 month backward
+            x<<=1
+            # adjust months and days
+            months-=1
+            days = (at-x).to_i
+        end
+        # move days forward
         x += days
+        if x>at
+            # move 1 day backward
+            x-=1
+            days-=1
+            if days<0
+                x+=1
+                x<<=1
+                months-=1
+                days = (at-x).to_i
+                x+=days
+            end
+        end
         # hours
         hours,r = (at.to_time-x.to_time).to_i.divmod 3600
         mins,secs = r.divmod 60