From 6ff54f70fdbddf2d068982e6ea4242b6b95104df Mon Sep 17 00:00:00 2001
From: David Heinemeier Hansson <david@loudthinking.com>
Date: Mon, 21 Feb 2005 14:18:54 +0000
Subject: Added Time::Calculations to ask for things like Time.now.tomorrow,
 Time.now.yesterday, Time.now.months_ago(4) #580 [DP|Flurin]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@731 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
---
 .../active_support/core_ext/time/calculations.rb   | 101 +++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 activesupport/lib/active_support/core_ext/time/calculations.rb

(limited to 'activesupport/lib/active_support/core_ext/time')

diff --git a/activesupport/lib/active_support/core_ext/time/calculations.rb b/activesupport/lib/active_support/core_ext/time/calculations.rb
new file mode 100644
index 0000000000..f5e9ab212c
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/time/calculations.rb
@@ -0,0 +1,101 @@
+module ActiveSupport #:nodoc:
+  module CoreExtensions #:nodoc:
+    module Time #:nodoc:
+      # Enables the use of time calculations within Time itself
+      module Calculations
+        # Seconds since midnight: Time.now.seconds_since_midnight
+        def seconds_since_midnight
+          self.hour.hours + self.min.minutes + self.sec + (self.usec/1.0e+6)
+        end
+            
+        # Returns a new Time where one or more of the elements have been changed according to the +options+ parameter. The time options
+        # (hour, minute, sec, usec) reset cascadingly, so if only the hour is passed, then minute, sec, and usec is set to 0. If the hour and 
+        # minute is passed, then sec and usec is set to 0.
+        def change(options, time_factory_method = :local)
+          ::Time.send(
+            time_factory_method, 
+            options[:year]  || self.year, 
+            options[:month] || self.month, 
+            options[:mday]  || self.mday, 
+            options[:hour]  || self.hour, 
+            options[:min]   || (options[:hour] ? 0 : self.min),
+            options[:sec]   || ((options[:hour] || options[:min]) ? 0 : self.sec),
+            options[:usec]  || ((options[:hour] || options[:min] || options[:usec]) ? 0 : self.usec)
+          )
+        end
+
+        # Returns a new Time representing the time a number of seconds ago, this is basically a wrapper around the Numeric extension
+        # Do not use this method in combination with x.months, use months_ago instead!
+        def ago(seconds)
+          seconds.until(self)
+        end
+
+        # Returns a new Time representing the time a number of seconds since the instance time, this is basically a wrapper around 
+        #the Numeric extension. Do not use this method in combination with x.months, use months_since instead!
+        def since(seconds)
+          seconds.since(self)
+        end
+
+        # Returns a new Time representing the time a number of specified months ago
+        def months_ago(months, time_factory_method = :local)
+          if months >= self.month 
+            change({ :year => self.year - 1, :month => 12 }, time_factory_method).months_ago(months - self.month)
+          else
+            change({ :year => self.year, :month => self.month - months }, time_factory_method)
+          end
+        end
+
+        def months_since(months, time_factory_method = :local)
+          if months + self.month > 12
+            change({ :year => self.year + 1, :month => 1 }, time_factory_method).months_since(
+              months - (self.month == 1 ? 12 : (self.month + 1))
+            )
+          else
+            change({ :year => self.year, :month => self.month + months }, time_factory_method)
+          end
+        end
+
+        # Returns a new Time representing the "start" of this week (sunday, 0:00)
+        def beginning_of_week
+          (self - self.wday.days).midnight
+        end
+        alias :sunday :beginning_of_week
+        alias :at_beginning_of_week :beginning_of_week
+        
+        # Returns a new Time representing the start of the day (0:00)
+        def beginning_of_day
+          self - self.seconds_since_midnight
+        end
+        alias :midnight :beginning_of_day
+        alias :at_midnight :beginning_of_day
+        alias :at_beginning_of_day :beginning_of_day
+        
+        # Returns a new Time representing the start of the month (1st of the month, 0:00)
+        def beginning_of_month
+          self - ((self.mday-1).days + self.seconds_since_midnight)
+        end
+        alias :at_beginning_of_month :beginning_of_month
+        
+        # Convenience method which returns a new Time representing the time 1 day ago
+        def yesterday
+          self.ago(1.day)
+        end
+        
+        # Convenience method which returns a new Time representing the time 1 day since the instance time
+        def tomorrow
+          self.since(1.day)
+        end
+           
+        # Returns a new Time of the current day at 9:00 (am) in the morning
+        def in_the_morning(time_factory_method = :local)
+          change({:hour => 9}, time_factory_method)
+        end
+
+        # Returns a new Time of the current day at 14:00 in the afternoon
+        def in_the_afternoon(time_factory_method = :local)
+          change({:hour => 14}, time_factory_method)
+        end        
+      end
+    end
+  end
+end
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