DateTime#age + spec

1 files changed, 37 insertions, 0 deletions

diff --git a/lib/ayk/age.rb b/lib/ayk/age.rb
new file mode 100644
index 0000000..fc1aeb3
--- /dev/null
+++ b/lib/ayk/age.rb
@@ -0,0 +1,37 @@
+#! /usr/bin/env ruby
+# -*- coding: UTF-8 -*-
+
+#----------------------------------------------------------------------------
+#
+# File     : age.rb
+# Author   : Jérémy Zurcher <jeremy@asynk.ch>
+# Date     : 22/08/09 
+#
+#----------------------------------------------------------------------------
+
+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
+        years = at.year-self.year
+        years -= 1 if ( self>>(12*years) ) > at
+        x = self>>(12*years)
+        # months
+        months = at.month-x.month+(12*(at.year-x.year))
+        months -= 1 if ( x>>months ) > at
+        x >>=months
+        # days
+        days = (at-x).to_i
+        x += days
+        # hours
+        hours,r = (at.to_time-x.to_time).to_i.divmod 3600
+        mins,secs = r.divmod 60
+        # return
+        [years,months,days,hours,mins,secs]
+    end
+end
+